2024/04/23 更新

写真a

ヨシタケ シンペイ
吉竹 晋平
所属
教育・総合科学学術院 教育学部
職名
准教授
学位
博士(学術) ( 2008年03月 広島大学 )

経歴

  • 2021年04月
    -
    継続中

    早稲田大学   教育・総合科学学術院   准教授

  • 2019年04月
    -
    2021年03月

    早稲田大学   教育・総合科学学術院   講師(専任)

  • 2012年07月
    -
    2019年03月

    岐阜大学   流域圏科学研究科   助手

  • 2012年04月
    -
    2019年03月

    早稲田大学   理工学研究所   招聘研究員

  • 2009年
    -
    2012年03月

    早稲田大学   教育・総合科学学術院   日本学術振興会特別研究員(PD)

  • 2008年04月
    -
    2009年03月

    早稲田大学   教育・総合科学学術院   日本学術振興会特別研究員(PD)(DC2からの資格変更)

  • 2007年04月
    -
    2008年03月

    広島大学   生物圏科学研究科   日本学術振興会特別研究員(DC2)

▼全件表示

学歴

  • 2005年04月
    -
    2008年03月

    広島大学   生物圏科学研究科   環境循環系制御学専攻(博士課程後期)  

  • 2003年04月
    -
    2005年03月

    広島大学   生物圏科学研究科   環境循環系制御学専攻(博士課程前期)  

  • 1999年04月
    -
    2003年03月

    広島大学   総合科学部   総合科学科  

委員歴

  • 2020年12月
    -
    2023年03月

    環境省「バイオ炭施用拡大による吸収源検討会」  有識者委員

  • 2021年04月
    -
    2022年03月

    日本生態学会  大会企画委員会ポスター部会長

  • 2019年04月
    -
    2022年03月

    日本生態学会  大会企画委員会ポスター部会員

  • 2017年01月
    -
    2019年03月

    日本生態学会中部地区会  会計幹事

所属学協会

  •  
     
     

    日本生態学会

  •  
     
     

    日本地球惑星科学連合

研究分野

  • 生態学、環境学

研究キーワード

  • バイオ炭

  • 窒素循環

  • 炭素循環

  • 生態化学量論

  • 生態遷移

  • 荒原生態系

  • 生態系の発達

  • 生態系生態学

  • 土壌微生物

  • 基質制限

  • 物質循環

  • リン脂質脂肪酸分析

  • 微生物呼吸

  • 微生物バイオマス

  • 微生物群集構造

▼全件表示

受賞

  • ポスター優秀賞

    2024年03月   日本生態学会   LCAを用いた森林でのバイオチャーによる炭素隔離の評価 ~作出から生態系応答まで~  

    受賞者: 樽見知樹, 友常満利, 進藤恵太, 依田真由, 吉竹晋平

  • ポスター賞

    2024年02月   第10回東京女子医科大学・早稲田大学研究交流セミナー   Life-Cycle Assessmentを用いた森林でのバイオチャーによる炭素隔離の評価 ~作出から生態系応答まで~  

    受賞者: 樽見知樹, 友常満利, 進藤恵太, 依田真由, 吉竹晋平

  • ポスター優秀賞

    2022年03月   日本生態学会   冷温帯コナラ林における非切断細根呼吸の日変化パターン  

    受賞者: 今吉健斗, 塩手文也, 吉竹晋平

  • ポスター賞

    2018年11月   日本生態学会中部地区会   金華山の常緑広葉樹林における生態系純生産量の推定  

    受賞者: 鈴木莉央奈, 曹若明, 陳思宇, 吉竹晋平, 大塚俊之

  • Ecological Research 論文賞

    2018年03月   日本生態学会   Seasonality of leaf litter and leaf area index data for various tree species in a cool-temperate deciduous broad-leaved forest, Japan, 2005-2014  

    受賞者: 永井信, 奈佐原, 西田, 顕郎, 吉竹晋平, 斎藤琢

  • ポスター賞

    2016年12月   日本生態学会中部地区会   分解速度はリターの多様性によって変化するのか~冷温帯落葉広葉樹林におけるササリターの影響~  

    受賞者: 浅井千由希, 吉竹晋平, 大塚俊之

  • ポスター優秀賞

    2013年03月   日本生態学会   冷温帯コナラ林におけるキノコのCO2 放出量とその季節変化  

    受賞者: 三島綾乃, 友常満利, 吉竹晋平, 小泉博

  • ポスター優秀賞

    2012年03月   日本生態学会・東アジア生態学連合   Diurnal and seasonal variations of soil, heterotrophic and root respiration estimated by automatic open/close chamber and trenching method  

    受賞者: M. Tomotsune, T. Anzai, S. Yoshitake, H. Koizumi

  • ポスター優秀賞

    2011年03月   日本生態学会   冷温帯シバ草原における温暖化操作実験 -炭素収支への影響-  

    受賞者: 関根有哉, 吉竹晋平, 小泉博

  • ポスター最優秀賞

    2010年03月   日本生態学会   ミクロMRIによる森林土壌構造の観察  

    受賞者: 友常満利, 吉竹晋平, 関根有哉, 小泉博

  • Best Presentation Award

    2008年12月   国立極地研究所   Photosynthetic characteristics of biological soil crusts in a High Arctic glacier foreland in Ny-Ålesund, Svalbard  

    受賞者: S. Yoshitake, M. Uchida, H. Koizumi, H. Kanda, T. Nakatsubo

  • ポスター優秀賞

    2008年03月   日本生態学会   河口干潟におけるCO2 フラックスと微生物群集に対するアナジャコの巣穴形成の影響  

    受賞者: 中尾拓貴, 佐々木晶子, 萩森優, 吉竹晋平, 中坪孝之

  • 学生表彰

    2008年03月   広島大学  

    受賞者: 吉竹 晋平

  • ポスター優秀賞

    2007年03月   日本生態学会   海岸砂丘における植生の発達に伴う土壌微生物群集の変化:リン脂質脂肪酸を指標として  

    受賞者: 吉竹晋平, 中坪孝之

  • 広島大学エクセレント・スチューデント・スカラーシップ(成績優秀学生)

    2007年03月   広島大学  

    受賞者: 吉竹 晋平

  • Poster Session Award

    2007年02月   Seventh International Conference on Global Change: Connection to the Arctic   Soil respiration in a High Arctic glacier foreland in Ny-Ålesund, Svalbard: Is it limited by low carbon and nitrogen availability?  

    受賞者: S. Yoshitake, M. Uchida, T. Nakatsubo, H. Koizumi, H. Kanda

  • ポスター優秀賞

    2006年03月   日本生態学会   北極ツンドラ生態系における凍結リターからのCO2放出  

    受賞者: 菅尚子, 内田雅己, 吉竹晋平, 神田啓史, 小泉博

  • ポスター最優秀賞

    2006年03月   日本生態学会   硫気荒原土壌におけるススキ実生の成長に対するアーバスキュラー菌根の役割  

    受賞者: 船津勇一, 吉竹晋平, 藤吉正明, 中坪孝之

  • ポスター最優秀賞

    2005年03月   日本生態学会   北極エルズミア島氷河後退域におけるリン脂質脂肪酸を指標とした土壌微生物相の解析  

    受賞者: 吉竹晋平, 内田雅己, 神田啓史, 中坪孝之

  • ポスター優秀賞

    2004年08月   日本生態学会   硫気荒原におけるリン脂質脂肪酸を指標とした土壌微生物群集構造の解析  

    受賞者: 吉竹晋平, 中坪孝之

▼全件表示

 

論文

  • Decrease in Inorganic Nitrogen and Net Nitrogen Transformation Rates with Biochar Application in a Warm-Temperate Broadleaved Forest

    Natsumi Yasuki, Wakana Saso, Hiroshi Koizumi, Yasuo Iimura, Toshiyuki Ohtsuka, Shinpei Yoshitake

    Forests   15 ( 3 ) 572 - 572  2024年03月  [査読有り]

    担当区分:最終著者, 責任著者

     概要を見る

    Changes in soil nutrient dynamics after biochar application may affect indirect carbon sequestration through changes in plant productivity in forest ecosystems. In the present study, we examined the effects of woody biochar application on soil nitrogen (N) cycling over 8 months in a warm-temperate deciduous broad-leaved forest. Mineral soil samples were collected from the plots treated with different biochar applications (0, 5, and 10 Mg ha−1), and the soil inorganic N concentration was measured. Net mineralization and nitrification rates were determined in each plot using the resin–core method. Soil temperature and water content did not change significantly, but the pH increased significantly following biochar application. Soil inorganic N concentrations (NH4+ and NO3−) and net N transformation rates (mineralization and nitrification rates) were significantly reduced. Microbial biomass and the nitrification ratio (the ratio of nitrification rate to mineralization rate) were unchanged, indicating that the decrease in soil inorganic N concentration was due to the reduced mineralization rate. Adsorption of substrates (from organic matter) by the applied biochar is the most likely reason for the reduction in the N mineralization rate. The results indicate that biochar application does not necessarily stimulate N transformation, which will affect indirect carbon sequestration.

    DOI

  • Canopy Phenology and Meteorology Shape the Seasonal Dynamics in Hydrological Fluxes of Dissolved Organic Carbon in an Evergreen Broadleaved Subtropical Forest in Central Japan

    Siyu Chen, Ruoming Cao, Shinpei Yoshitake, Toshiyuki Ohtsuka

    Forests   14 ( 5 ) 1013 - 1013  2023年05月  [査読有り]

     概要を見る

    Seasonal variabilities in hydrological fluxes of dissolved organic carbon (DOC) and their driving factors in the evergreen broad-leaved forest are inadequately understood. To aid this understanding, we conducted a three-year study to examine seasonal changes in DOC concentration and flux in throughfall, stemflow, and litter leachate in an evergreen broad-leaved subtropical forest in central Japan. We specifically addressed (1) how DOC in different hydrological fluxes vary on a monthly to seasonal basis, and (2) how canopy phenology and meteorology shape the DOC concentration and flux of throughfall, stemflow, and litter leachate trends in this evergreen forest. Clear seasonal changes were found in throughfall and stemflow DOC concentration but not in litter leachate DOC concentration; the highest throughfall DOC concentrations were observed in spring (10.03 mg L−1 in 2017 and 9.59 mg L−1 in 2018, respectively) and the highest stemflow DOC concentrations were observed in summer (13.95 mg L−1 in 2017 and 16.50 mg L−1 in 2018, respectively). Correlation analysis revealed the monthly throughfall DOC concentration to be positively related to the dry weight of fallen leaves (r = 0.72, p < 0.05) and flowers (r = 0.91, p < 0.05). In addition, Random Forest models predicted that the dry weight of flowers was a primary driver of throughfall DOC concentration and that the DOC concentrations of stemflow and litter leachate were constrained by the throughfall DOC concentration. DOC fluxes in different hydrological flux were significantly positive related to bulk precipitation amounts and temperature. Moreover, the throughfall DOC concentration had a considerable effect on throughfall and litter leachate DOC fluxes. Over 75% of annual net tree-DOC (throughfall + stemflow) fluxes and more than 70% of the annual litter leachate DOC fluxes were produced in the flowering season. Thus, we speculated that the seasonal phenological canopy changes (leaf emergence, fallen leaves, flowering, and pollen) and the sufficient rainfall had great impacts on the amount and quality of DOC concentrations in the evergreen forest; and, furthermore, that the DOC from different forest hydrological fluxes was a significant fraction of the carbon that accumulates in soils.

    DOI

  • Biometric-Based Net Primary Production (NPP) and the Effects of a Masting Event on Production Allocation in a Secondary Lucidophyllous Forest in Central Japan

    Toshiyuki Ohtsuka, Riona Suzuki, Siyu Chen, Ruoming Cao, Shinpei Yoshitake, Miyuki Kondo, Shogo Kato

    Forests   14 ( 1 ) 108 - 108  2023年01月  [査読有り]

     概要を見る

    Lucidophyllous (evergreen broad-leaved) forests are the dominant forests in human-dominated subtropical/warm-temperate regions in East Asia. Biometric-based estimates of net primary production (NPP) were conducted in a secondary lucidophyllous forest on Mt. Kinka (35°26′ N, 136°47′ E) near the northern limit of their distribution in central Japan for three years, including the masting event. The forest stand mainly consists of Castanopsis cuspidata (Thunb.) Schottky and Cleyera japonica Thunb. in the canopy and subtree layers, respectively. In 2018, the total NPP of the masting year was 14.53 ± 2.03 ton ha−1 yr−1, including woody NPP (above: 2.63 ± 0.35 ton ha−1 yr−1; below: 0.57 ± 0.08 ton ha−1 yr−1), foliage NPP (4.07 ± 0.23 ton ha−1 yr−1), reproductive NPP (4.81 ± 0.77 ton ha−1 yr−1), and fine root production (Pfr) (2.46 ± 1.84 ton ha−1 yr−1). Pfr and belowground production comprised 16.9% and 20.9%, respectively, of the total NPP. The nut production of C. cuspidata in 2018 (4.31 ± 0.75 ton ha−1 yr−1) was significantly higher than that in 2017 (0.77 ± 0.13 ton ha−1 yr−1) and 2019 (0.23 ± 0.06 ton ha−1 yr−1). No significant change was observed for the three years of foliage NPP and total NPP without Pfr. However, the woody NPP in 2018 (3.20 ± 0.43) was lower than in 2017 (5.37 ± 0.33 ton ha−1 yr−1) and 2019 (4.71 ± 0.38 ton ha−1 yr−1). This suggests that nut production in the masting years compensated by decreasing woody production in the Castanopsis forest.

    DOI

    Scopus

  • Organic carbon stock and composition in 3.5-m core mangrove soils (Trat, Thailand)

    M. Kida, I. Watanabe, K. Kinjo, M. Kondo, S. Yoshitake, M. Tomotsune, Y. Iimura, S. Umnouysin, V. Suchewaboripont, S.Poungparn, T. Ohtsuka, N. Fujitake

    Science of The Total Environment     149682 - 149682  2021年08月  [査読有り]  [国際共著]

    DOI

    Scopus

    17
    被引用数
    (Scopus)
  • Photosynthetic response of young oaks to biochar amendment in field conditions over 3 years

    Y. Tanazawa, M. Tomotsune, T. Suzuki, H. Koizumi, S. Yoshitake

    Journal of Forest Research   26 ( 2 ) 116 - 126  2021年03月  [査読有り]

    担当区分:最終著者, 責任著者

     概要を見る

    Amendment by biochar made by thermal degradation of biomass is expected to enhance carbon sequestration through stimulating carbon assimilation by plants. We clarified the effect of biochar amendment on the photosynthesis of trees in forest ecosystems. Biochar was applied to young oak trees (Quercus serrata) in temperate deciduous forest at rates of 0, 5, 10 and 20 Mg ha−1 in four plots (C0, C5, C10, and C20). The variation in photosynthetic parameters (the maximum photosynthetic rate: Pmax, maximum carboxylation rate: Vcmax and the potential rate of electron transport: Jmax) and leaf traits (the stomatal conductance: gc, leaf mass per area (LMA) and leaf nutrient concentrations) were examined every month during the growing seasons for 3 years. Pmax generally increased in C5 and C10 and did not increase in C20. Similarly, Vcmax and Jmax increased in C5 and C10 and correlated significantly positively with Pmax, suggesting that biochar amendment basically increased the photosynthetic rate through improvements in physiological activities but that there was a maximum useful dosage. We also found that gc, LMA and leaf nutrient (N, Mg, and S) showed significant positive correlations with Pmax, indicating that an increase in photosynthetic rates would be supported by these leaf traits. However, stimulation of photosynthesis became smaller year by year, indicating that the effects of biochar amendment faded gradually. We concluded that biochar amendment basically improved the photosynthesis of oak trees in the forest through the change of all gc, LMA and leaf nutrient concentrations but declined yearly.

    DOI

    Scopus

    9
    被引用数
    (Scopus)
  • Comparison of inter-annual variation in net primary production among three forest types in the same region over 7 years

    Y. Kato, M. Tomotsune, F. Shiote, Y. Koyama, H. Koizumi, S. Yoshitake

    Journal of Forest Research   26 ( 2 ) 110 - 115  2021年03月  [査読有り]

    担当区分:最終著者, 責任著者

    DOI

    Scopus

    2
    被引用数
    (Scopus)
  • Organic and inorganic nitrogen deposition in an urban evergreen broad-leaved forest in central Japan

    Ruoming Cao, Siyu Chen, Shinpei Yoshitake, Toshiyuki Ohtsuka

    Atmospheric Pollution Research   12 ( 2 ) 488 - 496  2021年02月  [査読有り]

    DOI

    Scopus

    5
    被引用数
    (Scopus)
  • Effects of the Application of Biochar to Plant Growth and Net Primary Production in an Oak Forest

    Toshiyuki Ohtsuka, Mitsutoshi Tomotsune, Masaki Ando, Yuki Tsukimori, Hiroshi Koizumi, Shinpei Yoshitake

    Forests   12 ( 2 ) 152 - 152  2021年01月  [査読有り]

    担当区分:最終著者

     概要を見る

    Few studies have evaluated the application of biochar to forest ecosystems and their responses under field conditions. We manually spread grounded biochar on the forest floor, at rates of 0 (control), 5, and 10 Mg ha−1 (C0, C5 and C10, respectively), of an oak forest in central Japan to test the effects of biochar on tree growth and productivity. The relative growth rate of the diameter at breast height (dbh) of canopy oak trees (dbh > 20 cm) significantly increased in C10 compared with that of the control (C0), but not in C5, in the second to third years after application. Despite the increasing growth rate of canopy trees, foliage production (NPPF) and woody production (NPPW) did not respond to biochar application. Conversely, the production of reproductive organs (NPPR, mainly oak acorns) increased in line with the biochar application rate gradients (1.04 ± 0.09 Mg ha−1 yr−1 in C0, 1.30 ± 0.08 Mg ha−1 yr−1 in C5, and 1.47 ± 0.13 Mg ha−1 yr−1 in C10). Since the contribution of NPPR to total NPP was fairly small, there were no significant differences in total NPP (=NPPW + NPPF + NPPR) for C5 (14.57 ± 0.20 Mg ha−1 yr−1) or C10 (16.11 ± 0.73 Mg ha−1 yr−1) compared with the control (15.07 ± 0.48 Mg ha−1 yr−1).

    DOI

    Scopus

    5
    被引用数
    (Scopus)
  • Composite effects of temperature increase and snow cover change on litter decomposition and microbial community in cool‐temperate grassland

    Shinpei Yoshitake, Nobuhiko Suminokura, Toshiyuki Ohtsuka, Hiroshi Koizumi

    Grassland Science   67 ( 4 ) 315 - 327  2020年12月  [査読有り]

    担当区分:筆頭著者, 責任著者

     概要を見る

    Abstract

    We aimed to clarify the individual and interactive effects of temperature increase during snow‐free seasons and snow depth change (increase/decrease) on litter decomposition and microbial community in cool‐temperate semi‐natural grassland. We conducted a 2‐year in situ composite warming experiment comprising temperature increase (ca. 2°C) using infrared heaters during snow‐free seasons and manual snow depth manipulation (±50% in snow depth) in Japanese grassland. Changes in litter mass remaining and litter carbon‐to‐nitrogen ratio (C/N ratio) were assessed by litter bag methods. Microbial biomass and community structure were determined by phospholipid fatty acid analysis. Litter decomposition constant (k) was low in the plots with temperature increase during snow‐free seasons (0.56) and with less snow cover (0.57), but combining these two treatments resulted in acceleration of decomposition (k = 0.70); probably, decreased decomposition in the cold climate of early spring resulting from advanced snow melting was compensated for by higher temperature. Differences in mass loss among the treatments were well explained by litter C/N, microbial biomass and microbial community structure. The plots with a high mass loss showed lower litter C/N ratio, larger microbial biomass and different microbial community structure comparing to the plots with low mass loss. Our results showed the complex responses of litter decomposition to summer and winter climate change and combination of less snow cover and summer warming seemed to accelerate the decomposition in cool‐temperate semi‐natural grassland.

    DOI

  • Lateral export of dissolved inorganic and organic carbon from a small mangrove estuary with tidal fluctuation

    T. Ohtsuka, T. Onishi, S. Yoshitake, M. Tomotsune, M. Kida, Y. Iimura, M. Kondo, V. Suchewaboripont, R. Cao, K. Kinjo, N. Fujitake

    Forests   11 ( 10 ) 1041 - 1041  2020年09月  [査読有り]

     概要を見る

    The significance of aquatic lateral carbon (C) export in mangrove ecosystems highlights the extensive contribution of aquatic pathways to the net ecosystem carbon budget. However, few studies have investigated lateral fluxes of dissolved organic carbon (DOC) and inorganic carbon (DIC), partly due to methodological difficulty. Therefore, we evaluated area-based lateral C fluxes in a small mangrove estuary that only had one exit for water exchange to the coast. We sampled water from the mouth of the creek and integrated discharge and consecutive concentration of mangrove-derived C (ΔC). Then, we estimated the area-normalized C fluxes based on the inundated mangrove area. DIC and DOC concentrations at the river mouth increased during ebb tide during both summer and winter. We quantified the ΔC in the estuary using a two-component conservative mixing model of freshwater and seawater. DIC and DOC proportions of ΔC concentrations at the river mouth during ebb tide was between 34% and 56% in the winter and 26% and 42% in the summer, respectively. DIC and DOC fluxes from the estuary were estimated to be 1.36 g C m−2 d−1 and 0.20 g C m−2 d−1 in the winter and 3.35 g C m−2 d−1 and 0.86 g C m−2 d−1 in the summer, respectively. Based on our method, daily fluxes are mangrove area-based DIC and DOC lateral exports that can be directly incorporated into the mangrove carbon budget.

    DOI

    Scopus

    14
    被引用数
    (Scopus)
  • Effect of crab burrows on CO2 flux from the sediment surface to the atmosphere in a subtropical mangrove forest on Ishigaki island, southwestern Japan

    M. Tomotsune, H. Arai, S. Yoshitake, M. Kida, N. Fujitake, K. Kinjo, T. Ohtsuka

    Estuaries and Coasts   43 ( 1 ) 102 - 110  2020年  [査読有り]

     概要を見る

    © 2019, Coastal and Estuarine Research Federation. To clarify the effects of crab burrows on variation in sediment CO2 flux in mangrove forest, we measured the traits of crab burrows (density and entrance area size) and the CO2 flux rate from sediment surfaces, in areas with and without burrows, in a subtropical mangrove forest on Ishigaki Island, southwestern Japan. Burrow density and entrance area showed significant differences among seasons (warm, middle, and cool) and mangrove zones (upper-, middle-, and downstream), which may have depended on crab phenology, life cycle, and species composition. The sediment CO2 flux rate was significantly higher at plots with crab burrows (B+) than at those without burrows (B−) in each zone and season. However, standardized sediment CO2 flux rate by burrow surface area at B+ plots did not differ significantly from that at B− plots. In addition, there were no significant differences in sediment temperature and sediment water content between the two types of plots. Moreover, the level of microbial respiration differed significantly between sediments collected from the deep part and those collected from either the ground surface part or burrow walls. These results suggest that crab burrows increase sediment CO2 flux from the mangrove forest floor by increasing the sediment–atmosphere interface area, thereby inducing a change to aerobic conditions in the sediments around burrows. Therefore, the seasonal and spatial effect of crab burrows on the forest floor should be considered when evaluating sediment CO2 flux and examining the role of the mangrove ecosystem as a carbon sink.

    DOI

    Scopus

    6
    被引用数
    (Scopus)
  • Effect of biochar addition on leaf-litter decomposition at soil surface during three years in a warm-temperate secondary deciduous forest, Japan

    Y. Minamino, N. Fujitake, T. Suzuki, S. Yoshitake, H. Koizumi, M. Tomotsune

    Scientific Reports   9 ( 1 ) 16961 (2019)  2019年11月  [査読有り]

    DOI PubMed

    Scopus

    20
    被引用数
    (Scopus)
  • P2-1-3 タイ王国トラート川河口マングローブ林における植生・深度別土壌有機物の分光学的特徴(2-1 土壌有機・無機成分の構造・機能・ダイナミクス,2019年静岡大会)

    渡邉 育弥, 木田 森丸, 友常 満利, 近藤 美由紀, 吉竹 晋平, 飯村 康夫, 金城 和俊, 大塚 俊之, 藤嶽 暢英

    日本土壌肥料学会講演要旨集   65   19 - 19  2019年09月

    DOI CiNii

  • Stemflow hydrology and DOM flux in relation to tree size and rainfall event characteristics

    S. Chen, R. Cao, S. Yoshitake, T. Ohtsuka

    Agricultural and Forest Meteorology   279   107753  2019年09月  [査読有り]

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    17
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  • 大白川ブナ・ミズナラ成熟林(old-growth forest)における土壌窒素無機化速度の空間変動解析

    飯村康夫, Suchewaboripont V, 廣田充, 吉竹晋平, 大塚俊之

    日本土壌肥料科学会誌   (in press)  2019年09月  [査読有り]

  • Priming effect of Miscanthus sinensis derived biochar on brown forest soil

    Y. Iimura, M. Natsuhara, T. Ohtsuka, M. Tomotsune, S. Yoshitake, H. Koizumi

    Soil Science and Plant Nutrition   (in press) ( 6 ) 550 - 556  2019年09月  [査読有り]

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    2
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    (Scopus)
  • Nitrogen deposition and responses of forest structure to nitrogen deposition in a cool-temperate deciduous forest

    R. Cao, S. Chen, S. Yoshitake, T. Ohtsuka

    Forests   10 ( 8 ) 631  2019年07月  [査読有り]

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    8
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    (Scopus)
  • Changes in dissolved organic matter composition and dynamics in a subtropical mangrove river driven by rainfall

    M. Kida, M. Tanabe, M. Tomotsune, S. Yoshitake, K. Kinjo, T. Ohtsuka, N. Fujitake

    Estuarine, Coastal and Shelf Science   223   6 - 17  2019年07月  [査読有り]

    DOI

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    29
    被引用数
    (Scopus)
  • Cultural ecosystem services provided by flowering of cherry trees under climate change: a case study of the relationship between the periods of flowering and festivals

    S. Nagai, T.M. Saitoh, S. Yoshitake

    International Journal of Biometeorology   63 ( 8 ) 1051 - 1058  2019年07月  [査読有り]

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    13
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    (Scopus)
  • Stand dynamics and aboveground net primary productivity of a mature subtropical mangrove forest on Ishigaki Island, south-western Japan.

    T. Ohtsuka, M. Tomotsune, V. Suchewaboripont, Y. Iimura, M. Kida, S. Yoshitake, M. Kondo, K. Kinjo

    Regional Studies in Marine Science   27  2019年03月  [査読有り]

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    13
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  • Priming effect of Miscanthus sinensis derived biochar on brown forest soil

    Iimura Y, Natsuhara M, Ohtsuka T, Tomotsune M, Yoshitake S, Koizumi H

    Soil Science and Plant Nutrition   65 ( 6 ) 550 - 556  2019年01月  [査読有り]

     概要を見る

    © 2019, © 2019 Japanese Society of Soil Science and Plant Nutrition. The role of biochar in the mitigation of CO2 emissions has been extensively studied in agricultural soils but is not well understood in Japanese forest soils, especially in relation to CO2 emissions from applied biochar and native soil C (i.e., the priming effect; PE). We hypothesized that the type of biochar and/or the application method (mixed or sprinkled) affect the direction and magnitude of PE in forest soil, and in particular, negative PE can be achieved relatively easily if biochar produced under higher temperature conditions were sprinkled on the soil surface. To test our hypothesis, we measured CO2 emissions from biochar-amended brown forest soil in Japan and examined its PE by conducting a medium-term (~4 months) incubation study. As substrates, we used plain straw from the C4 grass Miscanthus sinensis (SU) and two qualities of biochar produced from it at either 300°C (BC300) or 800°C (BC800) and compared two application methods: mixed into or sprinkled onto the soil. BC800 had a greater C content and C:N ratio as well a lower volatile matter content and higher nonvolatile matter content than BC300

    DOI

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    2
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    (Scopus)
  • Effect of crab burrows on CO2 efflux from the sediment surface to the atmosphere in a subtropical mangrove forest on Ishigaki Island, southwestern Japan

    M. Tomotsune, H. Arai, S. Yoshitake, M. Kida, N. Fujitake, K. Kinjo, T. Ohtsuka

    Estuaries and Coasts    2019年  [査読有り]

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    6
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  • Contribution of humic substances to dissolved organic matter optical properties and iron mobilization

    Morimaru Kida, Nobuhide Fujitake, Vilanee Suchewaboripont, Sasitorn Poungparn, Mitsutoshi Tomotsune, Miyuki Kondo, Shinpei Yoshitake, Yasuo Iimura, Kazutoshi Kinjo, Chatree Maknual, Toshiyuki Ohtsuka

    Aquatic Sciences   80 ( 3 ) 26  2018年07月  [査読有り]

     概要を見る

    Humic substances (HS) are the primary constituents of dissolved organic matter (DOM) and play pivotal roles in aquatic systems. Optical indices of DOM, such as specific UV absorbance (SUVA254), the fluorescence index (FI) and biological index (BIX), have gained wide interest because of their ease of use. In this study, we explored the relationship between HS and the indices in the Trat River Basin (eastern Thailand) from headwaters to the river mouth through the distinct dry and rainy seasons to examine whether changes in index values reflect variability in the relative contribution of HS to DOM, or %HS. The results show that %HS and the indices did not exhibit significant linear relationships (FI and BIX, P &gt
    0.05), or the relationships changed seasonally (SUVA254). However, analyzing the indices versus %HS did show clear DOM composition changes by season with more humic-like or terrestrial material in the rainy season. Relationships between DOM and dissolved iron (dFe) concentrations were also explored. Separating the relationships of DOM versus dFe into HS versus dFe and non-HS versus dFe provides us the opportunity to better understand which fraction contributes more to dFe mobilization. The results indicate stronger positive linear relationships between HS and dFe concentrations independent of river tributary. Overall, this study highlights the importance of quantifying HS for the study of DOM dynamics or compositional changes along a river transect as well as for DOM-induced iron mobilization.

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    20
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  • Effects of soil temperature and tidal condition on variation in carbon dioxide flux from soil sediment in a subtropical mangrove forest

    M. Tomotsune, S. Yoshitake, Y. Iimura, M. Kida, N. Fujitake, H. Koizumi, T. Ohtsuka

    Journal of Tropical Ecology   34 ( 4 ) 268 - 275  2018年07月  [査読有り]

    DOI

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    7
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  • 8 million phenological and sky images from 29 ecosystems from the Arctic to the tropics: the Phenological Eyes Network

    Shin Nagai, Tomoko Akitsu, Taku M. Saitoh, Robert C. Busey, Karibu Fukuzawa, Yoshiaki Honda, Tomoaki Ichie, Reiko Ide, Hiroki Ikawa, Akira Iwasaki, Koki Iwao, Koji Kajiwara, Sinkyu Kang, Yongwon Kim, Kho Lip Khoon, Alexander V. Kononov, Yoshiko Kosugi, Takahisa Maeda, Wataru Mamiya, Masayuki Matsuoka, Trofim C. Maximov, Annette Menzel, Tomoaki Miura, Toshie Mizunuma, Tomoki Morozumi, Takeshi Motohka, Hiroyuki Muraoka, Hirohiko Nagano, Taro Nakai, Tatsuro Nakaji, Hiroyuki Oguma, Takeshi Ohta, Keisuke Ono, Runi Anak Sylvester Pungga, Roman E. Petrov, Rei Sakai, Christian Schunk, Seikoh Sekikawa, Ruslan Shakhmatov, Yowhan Son, Atsuko Sugimoto, Rikie Suzuki, Kentaro Takagi, Satoru Takanashi, Shunsuke Tei, Satoshi Tsuchida, Hirokazu Yamamoto, Eri Yamasaki, Megumi Yamashita, Tae Kyung Yoon, Toshiya Yoshida, Mitsunori Yoshimura, Shinpei Yoshitake, Matthew Wilkinson, Lisa Wingate, Kenlo Nishida Nasahara

    Ecological Research   33 ( 6 ) 1 - 2  2018年06月  [査読有り]

     概要を見る

    We report long-term continuous phenological and sky images taken by time-lapse cameras through the Phenological Eyes Network (http://www.pheno-eye.org. Accessed 29 May 2018) in various ecosystems from the Arctic to the tropics. Phenological images are useful in recording the year-to-year variability in the timing of flowering, leaf-flush, leaf-coloring, and leaf-fall and detecting the characteristics of phenological patterns and timing sensitivity among species and ecosystems. They can also help interpret variations in carbon, water, and heat cycling in terrestrial ecosystems, and be used to obtain ground-truth data for the validation of satellite-observed products. Sky images are useful in continuously recording atmospheric conditions and obtaining ground-truth data for the validation of cloud contamination and atmospheric noise present in satellite remote-sensing data. We have taken sky, forest canopy, forest floor, and shoot images of a range of tree species and landscapes, using time-lapse cameras installed on forest floors, towers, and rooftops. In total, 84 time-lapse cameras at 29 sites have taken 8 million images since 1999. Our images provide (1) long-term, continuous detailed records of plant phenology that are more quantitative than in situ visual phenological observations of index trees
    (2) basic information to explain the responsiveness, vulnerability, and resilience of ecosystem canopies and their functions and services to changes in climate
    and (3) ground-truthing for the validation of satellite remote-sensing observations.

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    38
    被引用数
    (Scopus)
  • Soil microbial succession along a chronosequence on a High Arctic glacier foreland, Ny-Ålesund, Svalbard: 10 years’ change

    S. Yoshitake, M. Uchida, Y. Iimura, T. Ohtsuka, T. Nakatsubo

    Polar Science   16   59 - 67  2018年06月  [査読有り]

    DOI

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    20
    被引用数
    (Scopus)
  • Investigation of the potential of drone observations for detection of forest disturbance caused by heavy snow damage in a Japanese cedar (Cryptomeria japonica) forest

    S. Nagai, T.M. Saitoh, K. Kajiwara, S. Yoshitake, Y. Honda

    農業気象   74 ( 3 ) 123 - 127  2018年05月  [査読有り]

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    9
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    (Scopus)
  • Non-destructive measurement of soil respiration in a grassland ecosystem using the multiple-microchambers method

    Nobuhiko Suminokura, Mayuko Suzuki, Kenta Tanami, Mitsutoshi Tomotsune, Shinpei Yoshitake, Hiroshi Koizumi

    Ecological Research   33 ( 2 ) 471 - 477  2018年03月  [査読有り]

     概要を見る

    The chamber method with plant clipping has been widely used for measuring soil respiration (SR) in grassland ecosystems. However, plant clipping may cause overestimation of SR by changing the environmental factors and injuring the plants. To solve these problems, we developed a new non-destructive method using multiple-microchambers (3 cm diameter, 8 cm height), which enables measurement of SR without plant clipping by installing chambers into gaps among the grasses. The new method was compared with the conventional method at various flow rates in vitro to assess the accuracy of SR measurement. The new method overestimated the SR rate
    however, the ratio of overestimation to the conventional method was constant for each flow rate. These ratios fitted the logarithmic curve, indicating the potential for correction of the SR rate measured by the new method using the logarithmic equation. The corrected SR rate obtained by the new method was equal to the rate by the conventional method. This suggests that accurate measurement of SR in grassland ecosystems is possible using the multiple-microchambers method. We then compared the non-destructive method and the destructive method in situ on summer season and found that the destructive method overestimated SR rate in the grassland ecosystem by about 276% on average. There were two possible reasons for this overestimation
    first, the clipping treatment may change environmental conditions such as soil temperature and soil water content, and second, it may directly increase plant respiration.

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    2
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  • Soil net nitrogen mineralization at different ecosystem development stages after the year 2000 eruption on Miyakejima island

    J. Cui, M. Hirota, T. Kamijo, S. Yoshitake, K. Katoh

    Journal of Ecosystem and Ecography   8 ( 1 ) 250  2018年02月  [査読有り]

    DOI

  • Stand Dynamics and Biomass Increment in a Lucidophyllous Forest over a 28-Year Period in Central Japan

    Siyu Chen, Akira Komiyama, Shogo Kato, Ruoming Cao, Shinpei Yoshitake, Toshiyuki Ohtsuka

    FORESTS   8 ( 10 ) 397  2017年10月  [査読有り]

     概要を見る

    Secondary lucidophyllous forest is one of the dominant forests in human-dominated subtropical/warm-temperate regions in East Asia. There were few direct monitoring techniques to elucidate the following hypotheses: (a) self-thinning may govern the stand development process and (b) wood production decline can be observed during secondary succession in a lucidophyllous forest. We conducted a long-term study at a permanent plot in central Japan, since 1989. The forest consists mainly of Castanopsis cuspidata in a canopy layer, Cleyera japonica, and Eurya japonica in a subtree layer. During the 28-year period, the basal area of the stand significantly increased due to the growth of C. cuspidata, from 29.18 +/- 1.84 (87.8% of total) to 38.71 +/- 2.22 m(2) ha(-1) (91.9%), while the stem density of C. cuspidata significantly decreased from 666 +/- 13 to 404 +/- 10 stems ha(-1) in proportion to accumulating biomass (117.8 to 166.6 ton ha(-1)). The annual woody net primary production ranged from 2.40 +/- 0.13 to 3.93 +/- 0.33 ton ha(-1) year(-1) as a nearly 70-year-old forest. There was no age-related decline of woody net primary production (NPP) was found during secondary succession, and the growth of individual tree still increased when the self-thinning process governed the stand.

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    9
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  • Dissolved organic carbon (DOC) input to the soil: DOC fluxes and their partitions during the growing season in a cool-temperate broad-leaved deciduous forest, central Japan

    Siyu Chen, Shinpei Yoshitake, Yasuo Iimura, Chiyuki Asai, Toshiyuki Ohtsuka

    ECOLOGICAL RESEARCH   32 ( 5 ) 713 - 724  2017年09月  [査読有り]

     概要を見る

    Dissolved organic carbon (DOC) plays an important role in C cycling in forest ecosystems. Here we measured the concentrations and fluxes of DOC in a cool-temperate broad-leaved deciduous forest (Takayama Forest) to quantify the contribution of DOC from different forest water flux conditions. Mean DOC concentration during the growing season increased in the sequence from bulk precipitation (2.98 +/- 0.45 mg L-1), throughfall above dwarf bamboo (6.84 +/- 0.45 mg L-1), throughfall below dwarf bamboo (7.08 +/- 0.42 mg L-1), stemflow (15.05 +/- 0.98 mg L-1), and litter leachate (21.33 +/- 1.01 mg L-1). Litter leachate DOC concentration, being high in spring and autumn, which was fairly correlated with the amount of litterfall of bamboo and trees. In stemflow, the DOC concentration was high during early summer and gradually decreased, in addition, it also showed dramatic variation among different plant species. Litter leachate (72.5%) accounted for most of the DOC input to the soil during the growing season (311.5 kg C ha(-1) 7 months(-1)), while stemflow (1.6%) contributed the least. A great quantity of precipitation at the study site was associated with a subsequent high atmospheric contribution of DOC flux (8.6%), which was more than half of throughfall (16.5%). The high input of DOC to the soil and andisol soil characteristics at the Takayama Forest suggest that the DOC fluxes are vital to the soil carbon sequestration. Therefore, DOC fluxes should be taken into account when the carbon balance is assessed at forest ecosystems.

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    17
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  • マングローブ林における自動開閉チャンバー法を用いた干出・冠水土壌からの炭素放出の測定―土壌圏炭素動態の解明に向けた新たな試み―

    友常満利, 鈴木庸平, 大塚俊之, 吉竹晋平, 墨野倉伸彦, 新海恒, 小泉博

    日本生態学会誌   67 ( 2 ) 75 - 83  2017年08月  [査読有り]

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    2
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  • Seasonality of leaf litter and leaf area index data for various tree species in a cool-temperate deciduous broad-leaved forest, Japan, 2005-2014

    Shin Nagai, Kenlo Nishida Nasahara, Shinpei Yoshitake, Taku M. Saitoh

    ECOLOGICAL RESEARCH   32 ( 3 ) 297 - 297  2017年05月  [査読有り]

     概要を見る

    This paper reports seasonal data regarding leaf litter for 14 deciduous broad-leaved species and one evergreen coniferous species as well as leaf area index (LAI) data for the 14 deciduous broad-leaved species in a cool-temperate deciduous broad-leaved forest in Japan. The seasonal leaf biomass of various tree species is important for accurately evaluating ecosystem functions such as photosynthesis and evapotranspiration under climate change. However, there is a lack of freely available, long-term data. We collected litterfall every 1 to 4 weeks from September or October to November or December each year from 2005 to 2014 in Takayama, Japan (36A degrees 08'46aEuro(3)N, 137A degrees 25'23aEuro(3)E, 1420 m a.s.l.). After sorting the litter into leaves (according to species categories), stems + branches, and "other", we dried and weighed the litter groups. We also collected seasonal leaf data (number of leaves and leaf length and width) for each broad-leaved species, which we recorded every 1 to 4 weeks from April or May to October or November using multiple target shoots. To estimate the LAI in autumn for each deciduous broad-leaved species, we used a semi-empirical model of the vertical integration of leaf dry mass per unit leaf area. To estimate the LAI in spring and summer, we used the relationship between the LAI in autumn and the seasonal leaf data. Our data provide input, calibration, and validation parameters for determining LAI based on satellite remote-sensing observations or radiative transfer models and for use in ecosystem models.

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    9
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  • Spatial Upscaling of Soil Respiration under a Complex Canopy Structure in an Old-Growth Deciduous Forest, Central Japan

    Vilanee Suchewaboripont, Masaki Ando, Shinpei Yoshitake, Yasuo Iimura, Mitsuru Hirota, Toshiyuki Ohtsuka

    FORESTS   8 ( 2 ) 36  2017年02月  [査読有り]

     概要を見る

    The structural complexity, especially canopy and gap structure, of old-growth forests affects the spatial variation of soil respiration (Rs). Without considering this variation, the upscaling of Rs from field measurements to the forest site will be biased. The present study examined responses of Rs to soil temperature (Ts) and water content (W) in canopy and gap areas, developed the best fit model of Rs and used the unique spatial patterns of Rs and crown closure to upscale chamber measurements to the site scale in an old-growth beech-oak forest. Rs increased with an increase in Ts in both gap and canopy areas, but the effect of W on Rs was different between the two areas. The generalized linear model (GLM) analysis identified that an empirical model of Rs with the coupling of Ts and W was better than an exponential model of Rs with only Ts. Moreover, because of different responses of Rs to W between canopy and gap areas, it was necessary to estimate Rs in these areas separately. Consequently, combining the spatial patterns of Rs and the crown closure could allow upscaling of Rs from chamber-based measurements to the whole site in the present study.

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    6
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  • Measurements of carbon efflux from exposed and submerged sediment surfaces using the automatic open/close chamber method in a mangrove forest ― A challenge to clarify carbon dynamics in the pedosphere

    Mitsutoshi Tomotsune, Yohei Suzuki, Toshiyuki Ohtsuka, Shinpei Yoshitake, Nobuhiko Suminokura, Hisashi Shinkai, Hiroshi Koizumi

    Japanese Journal of Ecology   67 ( 2 ) 75 - 83  2017年  [査読有り]

     概要を見る

    We measured the CO2 flux from sediment surfaces (soil respiration in the pedosphere to the atmosphere) in a mangrove forest using an improved automatic open/close chamber (AOCC) method. Soil respiration rates and environmental factors were continuously measured from 4 to 8 July, 2013, in a mangrove dominated by Bruguiera gymnorrhiza. Variation in respiration rate did not exhibit a clear correlation with soil temperature. However, tidal effects were related to variation in soil temperature and may also have contributed to variation in respiration rate. High respiration rates were detected immediately before submergence or after exposure, due to the physical effects of tidal variation. Respiration rates during the period of exposure were lower than those in terrestrial ecosystems, likely due to three factors unique to mangrove forests: soil respiration measurements generally do not include root respiration, organic matter decomposition is restricted to a shallow anaerobic area, and some mineralized carbon is lost as dissolved inorganic carbon. Respiration rates during submergence were half of those measured during exposed conditions, suggesting that previous studies overestimated annual soil respiration. Therefore, measuring soil respiration rates during both exposed and submerged conditions using the AOCC method provides a much more accurate understanding of carbon dynamics in the pedosphere of mangrove forests.

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    2
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  • Effects of long-term experimental warming on plants and soil microbes in a cool temperate semi-natural grassland in Japan

    Mayuko Suzuki, Nobuhiko Suminokura, Kenta Tanami, Shinpei Yoshitake, Shingo Masuda, Mitsutoshi Tomotsune, Hiroshi Koizumi

    ECOLOGICAL RESEARCH   31 ( 6 ) 957 - 962  2016年11月  [査読有り]

     概要を見る

    To clarify the effects of long-term warming on ecosystem matter cycling, we conducted an in situ 7-year experimental warming (2009-2015) using infrared heaters in a cool temperate semi-natural grassland in Japan. We measured plant aboveground biomass, soil total C and N, soil inorganic N (NH4 (+)-N and NO3 (-)-N), and soil microbial biomass for 7 years (2009-2015). We also measured heterotrophic respiration for 2 years (2013-2014) and assessed net N mineralization and nitrification in 2015. We found that warming immediately increased plant aboveground biomass, but this effect ceased in 2013. However, the soil microbial biomass was continuously depressed by warming. Soil inorganic N concentrations in warmed plots substantially increased in the later years of the experiment (2013-2015) and the potential net N mineralization rate was also higher than in the earlier years. In contrast, heterotrophic respiration decreased with warming in 2013-2014. Our observations indicate that long-term warming has a contrasting effect on plants and soil microbes. In addition, the warming could have different effects on subterranean C and N cycling. To enhance the accuracy of estimation of future climate change, it is essential to continuously observe the warming effects on ecosystems and to focus on the change in subterranean C and N cycling.

    DOI

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    10
    被引用数
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  • Substrate limitation to soil microbial communities in a subalpine volcanic desert on Mount Fuji, Japan

    S. Yoshitake, M. Fujiyoshi, T. Masuzawa, H. Koizumi

    EUROPEAN JOURNAL OF SOIL BIOLOGY   73   34 - 45  2016年03月  [査読有り]

     概要を見る

    We examined two hypotheses based on laboratory amendment experiments: (1) that development of the soil microbial community on volcanic deserts was regulated by substrate limitation; and (2) that the type and the extent of substrate limitation would change along the succession gradient. Soils were collected from the early (Stage B) and the late (Stage F) stages of primary succession of a subalpine volcanic desert on Mt. Fuji and they were amended with three carbon (C) sources (glucose, cellulose, or lignin), inorganic nitrogen (N), or phosphorus (P) sources alone or in a mixture. Respiration rates were monitored for 25 days and changes in microbial biomass and community structure were examined using the content and composition of phospholipid fatty acids. For both soils, the magnitude of the microbial response differed depending on the type of C source and it decreased in the following order reflecting the availability to microorganisms: glucose > cellulose > lignin. For Stage B soil, although any single amendment did not affect the microbial properties, combined amendment of C (glucose) and N increased microbial respiration and biomass and shifted the microbial community structure. In contrast, microbial properties in Stage F soils responded positively to single amendments of C source. Our results suggest that the microbial community in the early stage of succession is primarily limited by simultaneous shortage of C and N sources but the quality of the C source becomes more important in the late successional stages, which have large, but recalcitrant, organic matter pools in the soil. (C) 2016 Elsevier Masson SAS. All rights reserved.

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    4
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  • Uncertainties involved in leaf fall phenology detected by digital camera

    Shin Nagai, Tomoharu Inoue, Toshiyuki Ohtsuka, Shinpei Yoshitake, Kenlo Nishida Nasahara, Taku M. Saitoh

    ECOLOGICAL INFORMATICS   30   124 - 132  2015年11月  [査読有り]

     概要を見る

    We evaluated the uncertainty in the estimation of year-to-year variability in the timing of leaf fall detected by the analysis of red, green and blue (RGB) values extracted from daily phenological images in a deciduous broad-leaved forest in Japan. We examined (1) the spatial distribution of individual tree species within a 1-ha permanent plot and the spatio-temporal variability of leaf litter of various species for 8 years; and (2) the relationship between the year-to-year variability of leaf fall detected by leaf litter and that detected by phenological images of various species. Uncertainties were caused by (1) the heterogeneous distribution of each species within the whole forest community; (2) the year-to-year variability of the timing of leaf fall among species; and (3) differences in leaf colouring and leaf fall patterns among species. Our results indicate the importance of integrating RGB analysis of each species and of the whole canopy on the basis of spatial locations of individuals and proportions of tree species within a forest to reduce uncertainty. (C) 2015 Elsevier B.V. All rights reserved.

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    6
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  • The effect of canopy structure on soil respiration in an old-growth beech-oak forest in central Japan

    Vilanee Suchewaboripont, Masaki Ando, Yasuo Iimura, Shinpei Yoshitake, Toshiyuki Ohtsuka

    ECOLOGICAL RESEARCH   30 ( 5 ) 867 - 877  2015年09月  [査読有り]

     概要を見る

    Soil respiration (R (s) ) is a key component in the estimation of the net ecosystem production (NEP) of old-growth forests, which are generally thought to have ceased carbon accumulation. The objectives of the present study were to characterize the spatial and temporal patterns of R (s) , and to identify the determinants of the spatial and temporal variability of R (s,) using general linear mixed models (GLMM), in an old-growth beech-oak forest. GLMM analyses identified monthly effect as a significant explanatory variable for temporal variation, as well as gap/canopy and soil water content (SWC) as explanatory variables for spatial variation, in R (s) . The complexity of vertical structure in the forest was reflected in the spatial pattern of R (s) , which was higher in canopy areas than in gap areas during the growing season, except in November. This spatial pattern was not affected by soil temperature. Moreover, SWC did not differ between gap and canopy areas, although SWC partially explained the spatial heterogeneity in R (s) . The carbon:nitrogen ratios of soil organic matter in canopy areas were significantly higher than those in gap areas. Fine root biomass was 1.7-fold greater in canopy areas than in gap areas, likely because of the higher R (s) in canopy areas, and root respiration made a much large contribution to R (s) than heterotrophic respiration. The different patterns of fine root biomass between gap and canopy areas mainly control the spatial heterogeneity in R (s) ; thus, it is worth considering the gap/canopy variability in R (s) when evaluating annual efflux in old-growth forests.

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    11
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  • Carbon accumulation rate of peatland in the High Arctic, Svalbard: Implications for carbon sequestration

    Takayuki Nakatsubo, Masaki Uchida, Akiko Sasaki, Miyuki Kondo, Shinpei Yoshitake, Hiroshi Kanda

    POLAR SCIENCE   9 ( 2 ) 267 - 275  2015年06月  [査読有り]

     概要を見る

    Moss tundra that accumulates a thick peat layer is one of the most important ecosystems in the High Arctic, Svalbard. The importance of this ecosystem for carbon sequestration was estimated from the apparent rates of carbon accumulation based on the C-14 age and amount of peat in the active layer. The study site at Stuphallet, Brogger Peninsula, northwestern Svalbard was covered with a thick peat layer dominated by moss species such as Calliergon richardsonii, Paludella squarrosa, Tomenthypnum nitens, and Warnstorfia exannulata. The average thickness of the active layer (brown moss and peat) was approximately 28 cm in 1 August 2011. The calibrated (cal) age of peat from the bottom of the active layer (20-30 cm below the peatland surface) ranged from 81 to 701 cal yr BP (median value of 2s range). Based on the total carbon (4.5-9.2 kg C m(-2)), the apparent rate of carbon accumulation in the active layer was 9.0-19.2 (g C m(-2) yr(-1)), which is similar to or greater than the net ecosystem production or net primary production reported for other vegetation types in this area. Our data suggest that moss tundra plays an important role in carbon sequestration in this area. (C) 2015 Elsevier B.V. and NIPR. All rights reserved.

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  • Change in biomass of an old-growth beech-oak forest of Mt. Hakusan over a 17-year period

    V. Suchewaboripont, Y. Iimura, S. Yoshitake, S. Kato, A. Komiyama, T. Ohtsuka

    Japanese Journal of Forest Environment   57 ( 1 ) 33 - 42  2015年06月  [査読有り]

     概要を見る

    成熟林における17年間での森林群落の構造的変化とバイオマスの時間変動を調べるために,白山の東斜面に位置する冷温帯落葉広葉樹林に1haの永久方形区を設置して,1995年と2012年に毎木調査を行った。この森林はブナとミズナラが優占しており,2012年調査時の最大DBHはそれぞれ,100.3cmと194.7cmに達した。17年間で,DBHが5cm以上の樹木密度は1haあたり908本から940本に増加したが,9本の林冠木の枯死が見られた。この林冠木の枯死のために,17年間でギャップは拡大し,さらにM-w図から見ると高木層と亜高木層での森林構造の変化が認められた。森林のバイオマスは1995年には537.8t ha^<-1>で,2012年には536.7t ha^<-1>であった。巨大なミズナラ林冠木の存在のために,この森林のバイオマスは日本国内で過去に報告された成熟ブナ林のどの値よりも大きかった。巨大なミズナラ林冠木の枯死で失われたバイオマス(73.7t ha^<-1>)は,ブナの成長によって補償されたために,17年間でバイオマスはほとんど変化しなかった。このブナ-ミズナラ成熟林は,ミズナラ林冠木の枯死に伴うギャップ拡大とブナの成長というように森林動態から見ると非平衡状態にあるが,森林バイオマスは定常状態に達していると考えられる。

    DOI CiNii

  • Soil microbial response to experimental warming in cool temperate semi-natural grassland in Japan

    Shinpei Yoshitake, Nozomi Tabei, Yu Mizuno, Hitomi Yoshida, Yuya Sekine, Makoto Tatsumura, Hiroshi Koizumi

    ECOLOGICAL RESEARCH   30 ( 2 ) 235 - 245  2015年03月  [査読有り]

     概要を見る

    To assess soil microbial response to global warming in cool temperate semi-natural grassland, we conducted an in situ warming experiment in grassland located in the mountains of central Japan. Five pairs of plots (control and warmed) of Zoysia japonica were established. For each pair of plots, one was warmed by ca. 2 A degrees C using infrared heaters during the growing seasons of 2009-2011. Above-ground biomass of Z. japonica was estimated using the modified point-frame method. Soil organic matter contents, soil total carbon and nitrogen contents, as well as inorganic nitrogen (ammonium and nitrate) contents were determined from soil samples. Total phospholipid fatty acid (PLFA) contents and PLFA compositions were determined and used as indices for total microbial biomass and community structure, respectively. Analyses showed that the warming increased the above-ground biomass of Z. japonica significantly. Soil organic matter and soil total nitrogen contents were significantly decreased, while soil ammonium content was significantly increased in the warmed plots. Soil microbial biomass (especially fungal biomass) was lower in the warmed plots, probably reflecting higher temperature, lower soil water content, and/or depletion in available nutrients. The significant decrease in fungal biomass, in combination with our PLFA composition data, suggests that the soil microbial community structure shifted from a fungal-dominated to a bacteria-dominated one, causing changes in community-level physiological activity.

    DOI

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    14
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  • Preliminary observations of soil organic layers using a compact MRI for non-destructive analysis of internal soil structure

    Mitsutoshi Tomotsune, Shinpei Yoshitake, Rina Masuda, Hiroshi Koizumi

    ECOLOGICAL RESEARCH   30 ( 2 ) 303 - 310  2015年03月  [査読有り]

     概要を見る

    Soil organic layer samples of two different forest types were observed using compact MRI to visualize internal structure and clarify physical properties of forest soil. Soil pores and organic materials were distinguished by differences in proton mobility and visualized with a spatial resolution of 234 A mu m. Soil pore ratios and water mobility were calculated by image processing, and their differences between the two forest soils were detected. Our results suggest that compact MRI has potential for non-destructive analysis of soil physical properties and is expected to have significant applications in ecological studies.

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    4
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  • Year-to-year blooming phenology observation using time-lapse digital camera images

    Shin Nagai, Shinpei Yoshitake, Tomoharu Inoue, Rikie Suzuki, Hiroyuki Muraoka, Kenlo Nishida Nasahara, Taku M. Saitoh

    JOURNAL OF AGRICULTURAL METEOROLOGY   70 ( 3 ) 163 - 170  2014年09月  [査読有り]

     概要を見る

    Long-term continuous phenological observation of cherry tree blooming is an important and challenging task in the evaluation of year-to-year weather and climate changes in spring in Japan. Here, (1) we performed daily field observations with a time-lapse digital camera in a deciduous broad-leaved forest in Japan from January 2004 to December 2013; and (2) we detected year-to-year variations in the blooming phenology of Prunus sargentii by visual inspection of the images and by image analysis. We found that (1) the red digital numbers (i.e., the digital intensity values of the red pixels; DNR) extracted from the time-lapse digital camera images tended to peak in full bloom; and (2) the green excess index (GET) (based on the red, green, and blue digital numbers) tended to be lowest in full bloom. These results indicate that DNR and GEI are useful for detecting the timing of full bloom in P. sargentii.

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    12
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  • Deposition and decomposition of cattle dung and its impact on soil properties and plant growth in a cool-temperate pasture

    Shinpei Yoshitake, Hiromi Soutome, Hiroshi Koizumi

    ECOLOGICAL RESEARCH   29 ( 4 ) 673 - 684  2014年07月  [査読有り]

     概要を見る

    Livestock dung provides an important direct pathway by which carbon and nutrients enter soils in pasture ecosystems and affects carbon and nitrogen cycling indirectly through changes in soil and plant properties. Here, we quantify dung deposition, decomposition, and the effects of dung on soil and plants in a Zoysia japonica grassland in Japan. We determined (1) the distribution of dung, (2) the mass loss rate of dung and the amount of carbon respired as CO2, and (3) changes in soil properties and aboveground biomass of Z. japonica. Dung deposition was 4.0-9.7 g C and 0.4-1.0 g N m(-2) year(-1) and distributed patchily (Morishita's I (delta) &gt; 1). Most (71 %) of the carbon in dung deposited in June was lost within a single grazing period by aerobic decomposition, more than mass loss rate of Z. japonica litter in the first year (about 50 %), suggesting that grazing and defecation can accelerate carbon cycling compared with the typical litterfall-decomposition regime. Nitrogen in dung mass entered the soil as ammonium nitrogen and was nitrified. The spatiotemporal distribution of these processes corresponded to that of stimulated Z. japonica growth. These results suggested that dung deposition significantly affected the inorganic nitrogen status of soil and, therefore, the growth of Z. japonica. However, these effects were very restricted temporally (July-August) and spatially (within 10 cm from dung edge). Thus, such spatiotemporally restricted effects combined with the patchy distribution of dung may contribute to the heterogeneous structure of pasture ecosystems.

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    46
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  • Effects of the burrowing mud shrimp, Upogebia yokoyai, on carbon flow and microbial activity on a tidal flat

    Akiko Sasaki, Hiroki Nakao, Shinpei Yoshitake, Takayuki Nakatsubo

    ECOLOGICAL RESEARCH   29 ( 3 ) 493 - 499  2014年05月  [査読有り]

     概要を見る

    Mud shrimps, Upogebia spp., are major constituents of macrobenthic communities in tidal flats in Japan. The impact of Upogebia yokoyai on carbon flow on tidal flats was examined by comparing CO2 emission rates from plots with and without burrows in the Kurose River estuary, Japan. In situ CO2 emission rates from plots with burrows were significantly higher than from those without. Laboratory measurements using sediment core samples that excluded respiration of macrobenthic organisms showed similar trends. Although there were no significant differences in grain size distribution, water content, or ignition loss between the sediment cores with and without burrows, oxidation-reduction potential was significantly higher in sediment cores with burrows. Analysis of phospholipid fatty acids (PLFA) indicated that microbial biomass and community structure did not differ significantly between cores with and without burrows. However, microbial respiration activity, as indicated by CO2 emission rates per total PLFA content, was significantly higher in sediment cores with burrows than in those without. Our results indicate that burrows of U. yokoyai change the physicochemical conditions and increase microbial activity in the sediment, significantly affecting carbon flow in the tidal flat.

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    13
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  • Separation of root and heterotrophic respiration within soil respiration by trenching, root biomass regression, and root excising methods in a cool-temperate deciduous forest in Japan

    Mitsutoshi Tomotsune, Shinpei Yoshitake, Shinya Watanabe, Hiroshi Koizumi

    ECOLOGICAL RESEARCH   28 ( 2 ) 259 - 269  2013年03月  [査読有り]

     概要を見る

    Trenching (Tr), root biomass regression (RR), and root excising (RE) methods were used to estimate the contribution of root (RR) and heterotrophic (HR) respiration to soil respiration (SR) in a cool-temperate deciduous forest in central Japan. The contribution ratios of RR to SR were 23 % (-16 to 46 %), 11 % (-19 to 61 %), and 115 % (20 to 393 %), as estimated by the Tr, RR, and RE methods, respectively. The contribution ratio showed clear seasonal variation with high values in summer for the Tr method, while they were undetectable for the RR and RE methods because of some methodological problems. These results suggest the Tr method is the best of the three methods used to estimate the contribution ratio of RR and HR to SR in the forest. Annual SR, RR, and HR rates, estimated by the Tr method, were 479, 369, 110 gC m(-2) year(-1), respectively. The seasonal variation of SR was mainly influenced by HR (77 %) throughout the year, while the influence of RR on SR was strongest in summer (46 %). This effect occurred because RR (Q (10) = 7.5) is more sensitive to temperature than HR (Q (10) = 3.2). Also, the contribution of fine RR to total RR was higher than that of coarse RR because of high respiratory activity (Q (10) and R (10)) as well as the large biomass of fine roots. These results suggest that each component of SR responds differently to the same environmental factors and their relative influence on SR changes across the seasons.

    DOI

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    30
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  • Successional changes in the soil microbial community along a vegetation development sequence in a subalpine volcanic desert on Mount Fuji, Japan

    Shinpei Yoshitake, Masaaki Fujiyoshi, Kenichi Watanabe, Takehiro Masuzawa, Takayuki Nakatsubo, Hiroshi Koizumi

    PLANT AND SOIL   364 ( 1-2 ) 261 - 272  2013年03月  [査読有り]

     概要を見る

    To study the relationship between vegetation development and changes in the soil microbial community during primary succession in a volcanic desert, we examined successional changes in microbial respiration, biomass, and community structure in a volcanic desert on Mount Fuji, Japan.
    Soil samples were collected from six successional stages, including isolated island-like plant communities. We measured microbial respiration and performed phospholipid fatty acid (PLFA) analysis, denaturing gradient gel electrophoresis (DGGE) analysis, and community-level physiological profile (CLPP) analysis using Biolog microplates.
    Microbial biomass (total PLFA content) increased during plant succession and was positively correlated with soil properties including soil water and soil organic matter (SOM) contents. The microbial respiration rate per unit biomass decreased during succession. Nonmetric multidimensional scaling based on the PLFA, DGGE, and CLPP analyses showed a substantial shift in microbial community structure as a result of initial colonization by the pioneer herb Polygonum cuspidatum and subsequent colonization by Larix kaempferi into central areas of island-like communities. These shifts in microbial community structure probably reflect differences in SOM quality.
    Microbial succession in the volcanic desert of Mt. Fuji was initially strongly affected by colonization of the pioneer herbaceous plant (P. cuspidatum) associated with substantial changes in the soil environment. Subsequent changes in vegetation, including the invasion of shrubs such as L. kaempferi, also affected the microbial community structure.

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    45
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  • Seasonal and Inter-annual Variations in Contribution Ratio of Heterotrophic Respiration to Soil Respiration in a Cool-temperate Deciduous Forest

    M. Tomotsune, R. Masuda, S. Yoshitake, T. Anzai, H. Koizumi

    Journal of Geography   122 ( 4 ) 745 - 754  2013年  [査読有り]

     概要を見る

    土壌呼吸に対する土壌生物呼吸の寄与率の季節および年変化と,それらの変化が森林生態系の炭素収支に与える影響を明らかにするために,呼吸量・土壌温度・土壌水分量の関係と約3年間の土壌生物呼吸の寄与率の季節および年変化を推定した。土壌生物呼吸はトレンチ法を用いて土壌呼吸から分離し,2009年11月から2012年9月まで土壌表面からのCO2放出速度を土壌温度,体積土壌含水率とともに測定した。また,トレンチ法の問題点である枯死根の分解にともなうCO2放出を,従来法よりも正確に考慮するため,これらの季節および年変化をルートバッグ法と2つの分解モデルを用いて推定した。<br> その結果,土壌温度や土壌水分量に対して土壌呼吸と土壌生物呼吸は異なる応答を示した。土壌温度の上昇にともない各呼吸量は上昇し,その応答性は土壌呼吸よりも土壌生物呼吸の方が低かった。一方,土壌水分量の上昇に伴い,土壌呼吸は増加したのに対して,土壌生物呼吸は減少した。したがって,土壌生物呼吸の寄与率は土壌温度及び土壌水分量が上昇するのにともない減少した。これらの結果は,土壌温度と土壌水分量の両方が同時に変化する野外環境において,呼吸量や寄与率が複雑に変動することを示唆している。<br> 本研究において土壌生物呼吸の年寄与率は2010年,2011年ともに62%であったが,この寄与率は大きな季節変化(60~100%)を示した。これらの季節変化を考慮しなかった場合,推定される2010年の土壌生物呼吸量は1.50から2.51 kg CO2 m-2 yr-1で変動し,この値は季節変化を考慮した場合(1.56 kg CO2 m-2 yr-1)の96~161%の値となった。また,土壌生物呼吸の寄与率の推定に土壌水分量を考慮しなかった場合,年寄与率は80%となった。この値から推定された土壌生物呼吸量は2.01 kg CO2 m-2 yr-1となり,土壌水分量を考慮した場合の128%の値となった。一方,寄与率の年変化は非常に小さく,推定される土壌生物呼吸量に大きな影響はなかった。したがって,森林生態系においてより正確な土壌生物呼吸量や森林の炭素収支を明らかにするためには,土壌生物呼吸の寄与率が明確な季節性を示すこと,そして土壌温度だけでなく土壌水分量による影響を強く受けていることを考慮することが重要である。

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  • 冷温帯シバ草原におけるCO2フラックスの温暖化に対する応答 ―赤外線ヒーター法を用いた野外温暖化操作実験による検証―

    関根有哉, 吉竹晋平, 友常満利, 増田莉菜, 小泉博

    地学雑誌   122 ( 4 ) 733 - 744  2013年  [査読有り]

     概要を見る

    The aim of this study is to clarify changes in the ecosystem carbon cycle in response to predicted global warming in various ecosystems including semi-natural grassland. To clarify responses of the whole ecosystem to warming in a semi-natural cool-temperate grassland, we conducted an in situ warming experiment and examined plant growth and CO2 flux responses. Five pairs (control and warmed plots) of Zoysia japonica plots were established. Warmed plots were warmed using infrared heaters from June to November 2009. Once a month, aboveground biomass (AGB) of Z. japonica was estimated using the point frame method. Net ecosystem production (NEP) and ecosystem respiration (Re) were determined from CO2 flux measured using the closed chamber method. Each month, relationships were obtained between photosynthetic photon flux density (PPFD) and NEP (PPFD-NEP curve) and soil temperature (ST) and Re (ST-Re curve). Monthly cumulative NEP, Re, and gross primary production (GPP, sum of NEP and Re) were calculated using these relationships and continuously recorded PPFD and ST data. Although there were some mechanical problems when using infrared heaters, the soil temperature in the warmed plots where infrared heaters worked well was an average of 2.3°C higher than the control plots. This suggests the heating method using infrared heaters is applicable to grassland ecosystems. AGB in the warmed plots tended to be higher (by a maximum of 70%) than in the control plots throughout the experimental period, suggesting that experimental warming affected the phenology and extended the growth period of Z. japonica. Initial slope and light compensation point of PPFD-NEP curve were significantly affected by the warming. Monthly cumulative GPP in the warmed plots tended to be higher (by a maximum of 32%) than in the control plots. This is partly explained by the increased biomass and changed photosynthetic characteristics in the warmed plots. Although not all parameters of the ST-Re curve were affected by warming, monthly cumulative Re in the warmed plots tended to be higher (by a maximum of 35%) than in the control plots. As a result, monthly cumulative NEP in the warmed plots tended to be higher than in the control plots, especially in July (approximately 70% higher) and October (approximately 100% higher). These results suggest that experimental warming affected the carbon cycle in semi-natural cool-temperate grassland by changing the phenology and photosynthetic characteristics of Z. japonica. To promote a better understanding of whole ecosystem responses to predicted warming, a longer term experiment and more detailed descriptions of carbon dynamics including the belowground part of the ecosystem are needed.

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  • Responses of Microbial Community to Soil Warming in Warm-Temperate Evergreen Broad-Leaved Forests

    X. Wang, T. Nakatsubo, A. Sasaki, S. Yoshitake, N. Liang, K. Nakane

    Japanese Journal of Forest Environment   55 ( 2 ) 139 - 143  2013年  [査読有り]

     概要を見る

    暖温帯常緑広葉樹林における土壌加温に対する微生物群集の反応

    DOI CiNii

  • Vegetation development and carbon storage on a glacier foreland in the High Arctic, Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, T. Ohtsuka, H. Kanda, H. Koizumi, T. Nakatsubo

    Polar Science   5 ( 3 ) 391 - 397  2011年09月  [査読有り]

    DOI CiNii

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  • Successional changes in ectomycorrhizal fungi associated with the polar willow Salix polaris in a deglaciated area in the High Arctic, Svalbard

    Masaaki Fujiyoshi, Shinpei Yoshitake, Kenichi Watanabe, Kenichi Murota, Yuki Tsuchiya, Masaki Uchida, Takayuki Nakatsubo

    POLAR BIOLOGY   34 ( 5 ) 667 - 673  2011年05月  [査読有り]

     概要を見る

    Polar willow (Salix polaris Wahlenb.), a mycorrhizal dwarf shrub, colonizes recently deglaciated areas in the High Arctic, Svalbard. To clarify successional changes in ECM fungi associated with S. polaris after glacier retreat, we examined the diversity and density of ECM fungi in culture and field conditions. Plant and soil samples were collected from three sites of different successional stages in the deglaciated area of Austre Broggerbreen, near Ny-lesund, Svalbard. The successional stages were early stage with newly exposed bare ground (site I), transient stage with scattered colonization of Salix (sites IIa and IIb), and late stage with well-developed vegetation (site III). No ECM colonization on Salix was observed in soils collected from bare ground in early and transient stages (sites I and IIa). However, most Salix individuals showed ECM colonization in soils collected from sites close to Salix colonies in transient and late stages (sites IIb and III). Based on molecular analyses and operational taxonomic unit (OTU: &gt; 95% ITS sequence similarity) delimitations, we identified 15 OTUs/species in eight genera. The dominant OTU/species of ECM fungi identified in the transient and late stages was Geopora sp.1 and Cenococcum sp.1, respectively. In the culture experiment, ECM diversity was greater in late stage (eight OTUs/species) than in transient stage (three OTUs/species). This pattern was consistent with field observations, i.e., late-stage sites contained more OTUs/species of ECM fungi. These results indicate that species diversity of ECM fungi increases and the dominant species changes with the progress of succession after glacier retreat in the High Arctic.

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    40
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  • Colonization of the polar willow Salix polaris on the early stage of succession after glacier retreat in the High Arctic, Ny-Ålesund, Svalbard

    T. Nakatsubo, M. Fujiyoshi, S. Yoshitake, H. Koizumi, M. Uchida

    Polar Research   29 ( 3 ) 385 - 390  2010年12月  [査読有り]

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  • Production of biological soil crusts in the early stage of primary succession on a High Arctic glacier foreland

    Shinpei Yoshitake, Masaki Uchida, Hiroshi Koizumi, Hiroshi Kanda, Takayuki Nakatsubo

    NEW PHYTOLOGIST   186 ( 2 ) 451 - 460  2010年  [査読有り]

     概要を見る

    We examined the photosynthetic characteristics and net primary production of biological soil crusts to evaluate their contribution to the carbon cycle in the High Arctic glacier foreland.
    Biological soil crust samples were collected from a deglaciated area in Ny-Alesund, Svalbard, Norway. Net photosynthetic rates (Pn) and dark respiration rates (R) of biological soil crusts were determined using CO(2) gas exchange rates. We examined the effects of moisture conditions, temperature and photon flux density on Pn and R, and estimated the net primary production by a model based on the relationships between abiotic factors and Pn and R.
    The maximum Pn value occurred at 50% of the maximum water-holding capacity. Pn decreased with increasing temperature and dropped below zero at high temperatures (c. &gt; 13 degrees C). The estimated net primary production of the biological soil crust was greater than the net primary production of other vegetation when based on ground surface area, during the early stage of primary succession. Model simulation showed that the net primary production of the biological soil crust decreased with increasing temperature.
    These results suggest that biological soil crust productivity plays an important role in the carbon cycle during the early stage of succession of the High Arctic glacier foreland, and is susceptible to temperature increases from global warming.

    DOI PubMed

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    被引用数
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  • 高緯度北極における非維管束植物の光合成生産におよぼす温度の影響

    内田 雅己, 吉竹 晋平, 神田 啓史, 中坪 孝之

    日本植物生理学会年会およびシンポジウム 講演要旨集   2009 ( 0 ) S0071 - S0071  2009年

     概要を見る

    IPCC(2007)の予測によると、今世紀末の地球表面温度の上昇は北極地域が最も著しいとされている。北極陸上生態系には、樹木を欠き、矮性の低木や草本、あるいは蘚苔類や地衣類によって優占されているツンドラ生態系が広がっている。ツンドラ生態系では、維管束植物に比べて非維管束植物の種数は多くなる傾向があり、ある地域では植物の種組成の7割以上を非維管束植物が占めることが知られている。本発表では、寒冷な地においても高い多様性を維持し、ツンドラ生態系の主要な構成要素となっている、非維管束植物の光合成生産におよぼす温度の影響について紹介する。<br>ノルウェー・スピッツベルゲン島、ニーオルスンにある東ブレッガー氷河後退域に優占する、カギハイゴケ、トゲエイランタイ、および藻類や地衣類等から成り、地表面に"かさぶた"状の構造体をつくるバイオロジカルソイルクラスト(以下、クラスト)の光合成特性を調査した。その結果、水分が供給されている際の最大光合成速度は、カギハイゴケ>トゲエイランタイ>クラストとなった。純光合成速度の至適温度は、カギハイゴケが最も高く、トゲエイランタイとクラストは低かった。温度上昇が光合成生産に与える影響を、モデルを用いて推定したところ、いずれの植物も純生産量は減少したが、その度合いは著しく異なり、温度上昇の影響は植物によって異なることが示唆された。

    DOI CiNii

  • 生態系発達の初期過程における土壌微生物群集の成立とその制限要因

    吉竹 晋平

    広島大学    2008年03月

  • Organic carbon and microbial biomass in a raised beach deposit under terrestrial vegetation in the High Arctic, Ny-Ålesund, Svalbard

    T. Nakatsubo, S. Yoshitake, M. Uchida, M. Uchida, Y. Shibata, H. Koizumi

    Polar Research   27 ( 1 ) 23 - 27  2008年  [査読有り]

    DOI

    Scopus

    12
    被引用数
    (Scopus)
  • Changes in soil microbial biomass and community composition along vegetation zonation in a coastal sand dune

    Shinpei Yoshitake, Takayuki Nakatsubo

    AUSTRALIAN JOURNAL OF SOIL RESEARCH   46 ( 4 ) 390 - 396  2008年  [査読有り]

     概要を見る

    We used phospholipid fatty acid (PLFA) analysis to examine the relation of microbial biomass and community composition to vegetation zonation on a coastal sand dune. Soil samples were collected along 3 line transects established from the shoreline to the inland bush. Total PLFA content and PLFA composition of soils were used as indices of total microbial biomass and community composition, respectively. The microbial biomass was much higher in the inland Vitex rotundifolia zone than in the seaside plots. The microbial community composition also differed among the vegetation zones, with a higher contribution of fungal biomarkers in the inland plots. The microbial biomass increased significantly with increasing soil organic matter (SOM) content, but was not correlated with soil salinity. These results suggest that microbial biomass in the coastal sand dune was controlled primarily by the accumulation of SOM. The microbial community composition also changed with SOM content in the seaside plots, but SOM had little effect in the inland plots. These results suggest that the factors limiting the microbial community composition differed with location on the dune.

    DOI CiNii

    Scopus

    10
    被引用数
    (Scopus)
  • Carbon and nitrogen limitation to microbial respiration and biomass in an acidic solfatara field

    Shinpei Yoshitake, Akiko Sasaki, Masaki Uchida, Yuichi Funatsu, Takayuki Nakatsubo

    EUROPEAN JOURNAL OF SOIL BIOLOGY   43 ( 1 ) 1 - 13  2007年01月  [査読有り]

     概要を見る

    The solfatara field is a unique ecosystem characterized by harsh conditions such as acidic soils. We examined the respiration rate and phospholipid fatty acid (PLFA) content of solfatara soils and their responses to carbon and nitrogen addition. to determine whether soil microbial respiration and biomass in a solfatara field are limited by substrate availability. Soil samples were collected from locations along a transect across a solfatara field in Oita Prefecture, Japan. The soil in the central part of the solfatara field was highly acidic (pH 2.4) and contained low amounts of carbon and nitrogen. Low basal respiration rates were detected in these soil samples. Measurements of substrate-induced respiration (SIR) and PLFA contents suggested that it was partly attributable to low microbial biomass. Addition of a carbon source (glucose) to the solfatara soil engendered a marked increase in the microbial respiration rate, whereas the nitrogen source (ammonium nitrate) application had no marked effect. Addition of both carbon and nitrogen caused a nearly eightfold increase in the microbial respiration rate and a threefold increase in the total PLFA contents. These results suggest that some acidophilic and/or acid-tolerant microorganisms exist in solfatara soil, but that their respiration and biomass are limited by low substrate availability. (c) 2006 Elsevier Masson SAS. All rights reserved.

    DOI

    Scopus

    34
    被引用数
    (Scopus)
  • Carbon and nitrogen limitation of soil microbial respiration in a High Arctic successional glacier foreland near Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, H. Koizumi, T. Nakatsubo

    Polar Research   26 ( 1 ) 22 - 30  2007年  [査読有り]

    DOI

    Scopus

    80
    被引用数
    (Scopus)
  • Characterization of soil microflora on a successional glacier foreland in the high Arctic on Ellesmere Island, Nunavut, Canada using phospholipid fatty acid analysis

    S. Yoshitake, M. Uchida, T. Nakatsubo, H. Kanda

    Polar Bioscience   19   73 - 84  2006年01月  [査読有り]

     概要を見る

    We investigated soil microbial biomass and community structure along a primary successional gradient after deglaciation in the high Arctic, at Ellesmere Island, Nunavut, Canada(80°50'N, 82°45'W). Soil samples were collected from five glacial moraines(M1 to M5) with different developmental periods. Time since the recession of glaciers at M1, M3, and M5 was estimated to be 300, 9000, and over 17000 years, respectively. Soil samples from five points in each moraine were subjected to phospholipid fatty acid(PLFA) analysis. Total PLFA content(an index of microbial biomass) in M1 was significantly lower than those in older moraines(M2-M5), whereas the content remained at an almost constant level from M2 to M5. Significant differences in PLFA composition(an index of microbial community structure) were also observed between M1 and older moraines(M2-M5); the proportion of straight chain saturated fatty acids in M1 was higher than those in older moraines(M2-M5), whereas those of branched fatty acids and unsaturated fatty acids in M1 were lower than those in older moraines(M2-M5). These results suggest that changes of microflora occurred in the early phase of succession after deglaciation and became stable thereafter. Microbial biomass had a positive correlation with soil carbon and nitrogen contents over the successional chronosequence, suggesting that development of soil microflora was affected in part by organic matter accumulation.

    CiNii

  • 硫気荒原における土壌微生物バイオマスとその制限要因

    吉竹 晋平

    広島大学    2005年03月

  • 北極エルズミア島氷河後退域におけるリン脂質脂肪酸を指標とした土壌微生物相の解析

    吉竹 晋平, 内田 雅己, 神田 啓史, 中坪 孝之

    日本生態学会大会講演要旨集   52 ( 0 ) 510 - 510  2005年

     概要を見る

    土壌微生物は有機物分解や無機化を通して土壌生成に重要な役割を果たしており、その質や量(バイオマスや群集構造、活性)は、土壌が未発達な一次遷移初期においても重要であると考えられる。氷河後退後に一次遷移が見られる高緯度北極域では、植生や土壌理化学性の変化に関して多数の報告があるが、土壌微生物相の遷移についての情報は少ない。本研究では北極エルズミア島オーブロヤー湾周辺(N80˚50',W82˚45')の氷河後退域において、一次遷移の進行に伴う微生物相の変化を明らかにすることを目的とした。微生物のバイオマス及び群集構造の解析には、リン脂質脂肪酸分析を用いた。この方法は、微生物の細胞膜成分であるリン脂質由来の脂肪酸を分析する方法であり、特定の微生物グループの指標となる脂肪酸を定性・定量することで、量的な情報と同時に質的な情報が得られるという利点がある。<br> 2004年7月に、オーブロヤー湾周辺の生成年代が異なるモレーン上に、計5つのプロット(最新期、新期、中期、古期、最古期)を設置した。モレーンの生成年代は250年程度から25000–35000年程度と推定されている。各プロットにつき5箇所から、鉱質土層の0–0.5,0.5–2.0,2.0–5.0 cmを採取した。土壌は真空乾燥させて日本に持ち帰った後、リン脂質脂肪酸分析に供した。<br> 微生物バイオマスの指標である全脂肪酸量は、新期–最古期の4プロットに比べて最新期で著しく少なかったが、新期–最古期間での変化は小さく、むしろ同一プロット内の植生の異なる地点間で大きな違いが認められた。群集構造の指標の1つである糸状菌/バクテリアバイオマス比も採取地点の植生及び深度によって大きく異なった。これらの違いについて、モレーンの生成年代や植生、土壌中C・N量などと関連付けて議論する。

    DOI CiNii

  • スバールバル諸島ニーオルスン氷河後退域における土壌と植生の発達

    大塚 俊之, 内田 雅己, 吉竹 晋平, 中坪 孝之

    日本生態学会大会講演要旨集   51 ( 0 ) 674 - 674  2004年

     概要を見る

    スバールバル諸島・ニーオールスンには、氷河後退域のツンドラ生態系が広がっており、氷河後退時期や微地形などの違いにより植生のモザイク状分布が認められる。生態系機能は植生タイプと密接に関係しており、ツンドラ生態系の広域的な炭素固定機能評価の第一段階として、一次遷移に伴う土壌の発達プロセスと植生構造との関係を明らかにすることを目的とした。<br> 2003年の8月に東ブレッガー氷河の先端から海岸まで約3kmのライントランセクトを5本設定し、各トランセクト上に200m間隔で調査プロット(各4m2) を設置した。各プロットにおいて、植生調査として藻類の被度と、コケ・地衣植物及び維管束植物のリストと被度、土壌調査として地表面の礫被度、動物の糞被度、土壌深度、土壌水分量、pHの測定を行った。さらに各調査プロットの複数の地点で深さ別の土壌サンプリングを行い土壌中の全炭素量と全窒素量を測定した。<br> 調査を行った全64プロットにおいて維管束植物は43種出現した。維管束植物の出現しない場所を除いた51プロットの組成からTWINSPANにより植生タイプを区分した結果、Salix polarisOxilia digynaを指標種として、両種が出現しないプロット(氾濫源と若い氷河後退域)と両種の出現するプロット(古い氷河後退域)の大きく二つのグループに分けられた。一次遷移の初期段階である、前者のグループでは礫被度は80%以上で、土壌深度は浅くpHは8以上のアルカリ性を示した。このグループのプロットでは植物の被度は極端に少ないが、コケや地衣類とほぼ同時に一次遷移のごく初期段階から維管束植物のSaxifraga oppositifolia が侵入することが確認された。一次遷移が進行した後者のグループでは土壌深度は10cmを超える場合もあり、pHもほぼ中性であった。このグループのプロットでは維管束植物のSalix polarisとコケ植物のSanionia uncinataが優占する群落が広がっているが、地形的要因によって、Dryas octopetala群落などのいくつかの植生タイプが区分された。

    DOI CiNii

  • 硫気荒原における有機物分解と微生物活性

    吉竹 晋平

    広島大学   50 ( 0 ) 292 - 292  2003年03月

    DOI CiNii

▼全件表示

書籍等出版物

  • 生態系生態学(第2版)

    F. Stuart, Chapin III, Pamela A. Matson, Peter M. Vitousek, 加藤 知道( 担当: 共訳,  担当範囲: 分解と生態系炭素収支)

    森北出版  2018年07月 ISBN: 9784627261228

講演・口頭発表等

  • 森林へのバイオ炭施用が土壌微生物群集に及ぼす短期的影響

    吉竹晋平, 佐宗若奈, 安木奈津美, 飯村康夫, 大塚俊之, 近藤美由紀, 友常満利, 藤嶽愓英, 橋本麗優, 小泉博

    日本土壌肥料学会2023年度愛媛大会  

    発表年月: 2023年09月

  • 森林生態系へのバイオ炭の施用~野外散布実験と生態系・土壌圏の応答に関する長期モニタリング~

    吉竹晋平  [招待有り]

    関西土壌肥料協議会第101回シンポジウム  

    発表年月: 2022年12月

  • Three-year’s responses of soil nutrients and microbial community to the biochar amendment in a warm-temperate deciduous forest in Japan

    S. Yoshitake, M. Tomotsune, H. Koizumi, T. Ohtsuka

    American Geophysical Union 2019 Fall Meeting  

    発表年月: 2019年12月

  • 冷温帯落葉広葉樹林において樹幹流が土壌圏の炭素動態と微生物群集に及ぼす影響

    吉竹 晋平

    第66回日本生態学会大会  

    発表年月: 2019年03月

  • 石垣島マングローブ林内河川水中における溶存態無機炭素(DIC)濃度の時空間変動

    吉竹 晋平

    日本地球惑星科学連合2018年大会  

    発表年月: 2018年05月

  • 森林生態系における林床へのバイオチャー散布が土壌微生物群集に及ぼす影響

    吉竹晋平, 友常満利, 墨野倉伸彦, 小泉博, 大塚俊之

    第65回日本生態学会大会   (札幌市) 

    発表年月: 2018年03月

  • Effect of biochar amendment on the soil nutrient status and microbial community in a temperate forest, Japan

    S. Yoshitake, M. Tomotsune, N. Suminokura, H. Koizumi, T. Ohtsuka

    2nd International symposium of river basin studies   (岐阜市) 

    発表年月: 2018年03月

  • 微生物から考えてみた

    吉竹 晋平  [招待有り]

    第64回日本生態学会大会   (東京) 

    発表年月: 2017年03月

  • Soil in the Takayama site –characterization from microbial perspective-

    S. Yoshitake, T. Ohtsuak

    The 1st of International symposium of river basin studies   (岐阜市) 

    発表年月: 2017年03月

  • 陸域生態系における土壌呼吸と土壌微生物群集

    吉竹 晋平  [招待有り]

    日本気象学会2016年度秋季大会   (名古屋) 

    発表年月: 2016年10月

  • 岐阜大学流域圏科学研究センター高山試験地の紹介

    吉竹晋平

    高山市快適環境づくり市民会議平成27年度推進大会   (高山市) 

    発表年月: 2016年03月

  • マングローブ林における有機物分解:潮汐の影響を考慮した堆積物からの無機態炭素放出速度の測定

    吉竹 晋平

    第63回日本生態学会大会   (仙台) 

    発表年月: 2016年03月

  • 草原のリター分解は冬と夏の温暖化にどう応答するのか?

    吉竹 晋平

    第17回高山セミナー   (岐阜) 

    発表年月: 2016年02月

  • 冬と夏の温暖化が草原のリター分解に及ぼす影響

    吉竹 晋平

    2015年度日本生態学会中部地区大会   (高山) 

    発表年月: 2015年10月

  • 冷温帯落葉広葉樹林における窒素無機化速度の時空間変動

    吉竹晋平, 吉竹彩子, 飯村康夫, 大塚俊之

    第62回日本生態学会大会   (鹿児島) 

    発表年月: 2015年03月

  • 落葉広葉樹林(TKYサイト)における窒素無機化速度の時空間変動

    吉竹晋平, 吉竹彩子, 飯村康夫, 大塚俊之

    第16回高山セミナー   (つくば) 

    発表年月: 2015年02月

  • Primary succession of soil microbial community in Ny-Ålesund

    S. Yoshitake, M. Uchida, T. Ohtsuka, T. Nakatsubo

    20th anniversary workshop for terrestrial biological study in Ny-Ålesund, Svalbard   (Tokyo, Japan) 

    発表年月: 2015年02月

  • 高山サイトにおける窒素無機化速度の時空間変動

    吉竹晋平, 吉竹彩子, 飯村康夫, 大塚俊之

    中部山岳地域環境変動研究機構2014年度年次研究報告会   (長野県上伊那郡) 

    発表年月: 2014年12月

  • Spatial distribution of soil microbial characteristics in a cool-temperate deciduous broadleaved forest in Takayama

    S. Yoshitake, A. Yoshitake, Y. Iimura, T. Ohtsuka

    日本地球惑星科学連合2014年大会   (横浜) 

    発表年月: 2014年05月

  • 高緯度北極ニーオルスンの氷河後退域における土壌微生物群集の遷移

    吉竹晋平, 内田雅己, 大塚俊之, 中坪孝之

    第61回日本生態学会大会   (広島) 

    発表年月: 2014年03月

  • 高山サイト冷温帯落葉広葉樹林における土壌微生物特性の空間分布

    吉竹晋平, 吉竹彩子, 飯村康夫, 大塚俊之

    中部山岳地域環境変動研究機構2013年度年次研究報告会   (上田) 

    発表年月: 2013年11月

  • わたしたちの森を支える土の中の生き物たち

    吉竹晋平

    高山サイト20周年記念一般公開講演会   (高山) 

    発表年月: 2013年10月

  • Soil microbial responses to three years of experimental warming in a cool temperate grassland in Takayama, Japan

    S. Yoshitake, N. Tabei, Y. Mizuno, H. Yoshida, Y. Sekine, M. Tatsumura, H. Koizumi

    Synthesis Workshop on the Carbon Budget and Forest Ecosystem in the Asian Monitoring Network -The 20th Anniversary of the Takayama Site-   (Takayama, Japan) 

    発表年月: 2013年10月

  • 富士山火山荒原における一次遷移に伴う土壌微生物群集の変化

    吉竹晋平, 藤吉正明, 渡辺憲一, 増沢武弘, 中坪孝之, 小泉博

    日本地球惑星科学連合2013年大会   (千葉) 

    発表年月: 2013年05月

  • 富士山火山荒原の土壌微生物群集に対する基質制限~リン脂質脂肪酸を指標として~

    吉竹晋平

    第60回日本生態学会大会   (静岡) 

    発表年月: 2013年03月

  • 高緯度北極氷河後退域における生産者としての土壌クラストの重要性

    吉竹晋平

    第60回日本生態学会大会   (静岡) 

    発表年月: 2013年03月

  • 冷温帯放牧シバ草原における牛糞の供給と分解、そして土壌圏への影響

    吉竹晋平, 五月女皓海, 小泉博

    中部山岳地域環境変動研究機構2012年度年次研究報告会   (高山) 

    発表年月: 2012年12月

  • Belowground ecosystem responses to three years of experimental warming in a cool temperate grassland

    S. Yoshitake, N. Tabei, Y. Mizuno, H. Yoshida, Y. Sekine, M. Tatsumura, H. Koizumi

    The 59th Annual Meeting of ESJ and the 5th EAFES International Congress   (Otsu, Japan) 

    発表年月: 2012年03月

  • Effects of experimental warming on belowground ecosystem in a cool temperate grassland

    S. Yoshitake, N. Tabei, Y. Mizuno, H. Yoshida, Y. Sekine, M. Tatsumura, H. Koizumi

    14th Takayama Seminar held jointly with JSPS-NRF-NDFC A3 Foresight Program Seminar   (Gifu, Japan) 

    発表年月: 2012年02月

  • Successional changes in soil microbial community along the primary succession on a volcanic desert of Mt. Fuji

    S. Yoshitake, M. Fujiyoshi, K. Watanabe, M. Uchida, T. Masuzawa, T. Nakatsubo, H. Koizumi

    The 33rd Symposium on Polar Biology   (Tokyo japan) 

    発表年月: 2011年11月

  • 荒原生態系における土壌微生物群集の制限要因:富士山火山荒原の土壌微生物に対する炭素・窒素・リン制限

    吉竹晋平, 藤吉正明, 中坪孝之, 増沢武弘, 小泉博

    第58回日本生態学会大会   (札幌) 

    発表年月: 2011年03月

  • 放牧シバ草原において牛糞が土壌および植生に与える影響

    吉竹晋平

    第13回高山セミナー   (岐阜) 

    発表年月: 2011年02月

  • Vegetation development and carbon storage on a glacier foreland in the High Arctic, Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, T. Ohtsuka, H. Kanda, H. Koizumi, T. Nakatsubo

    Second International Symposium on the Arctic Research   (Tokyo, Japan) 

    発表年月: 2010年12月

  • Relationship between vegetation development and carbon storage on a glacier foreland in the High Arctic, Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, T. Ohtsuka, H. Kanda, H. Koizumi, T. Nakatsubo

    32nd Symposium on Polar Biology   (Tokyo, Japan) 

    発表年月: 2010年11月

  • 高緯度北極スヴァールバル諸島ニーオルスンの氷河後退域における一次遷移に伴う植生タイプ別純一次生産量の変化

    吉竹晋平, 内田雅己, 村岡裕由, 小泉博, 中坪孝之

    日本地球惑星科学連合2010年大会   (千葉) 

    発表年月: 2010年05月

  • 炭素源資化性から見た富士山火山荒原の土壌微生物群集

    吉竹晋平, 藤吉正明, 内田雅己, 中坪孝之, 増沢武弘, 小泉博

    第57回日本生態学会大会   (東京) 

    発表年月: 2010年03月

  • Project introduction -Carbon sequestration in an Arctic terrestrial ecosystem following rapid glacier retreat: Long-term change and future projection-

    S. Yoshitake

    Japan-Norway Joint Workshop   (ノルウェー・トロムソ) 

    発表年月: 2010年03月

  • 生態系発達の初期過程における土壌微生物群集の変化~荒原生態系の比較から見えてきたこと~

    吉竹晋平

    第12回高山セミナー・日中韓フォーサイト事業セミナー   (岐阜) 

    発表年月: 2010年02月

  • 北極域における炭素循環

    吉竹晋平

    第15回極域研究懇談会   (富山) 

    発表年月: 2010年01月

  • Interactions among plant, soil, and microbes: how microbial diversity and function in soil govern ecosystem processes

    S. Yoshitake  [招待有り]

    個体群生態学会第25回大会   (Kyoto, Japan) 

    発表年月: 2009年10月

  • 高緯度北極ニーオルスンの氷河後退域における炭素循環に対する土壌クラストの影響

    吉竹晋平, 内田雅己, 村岡裕由, 小泉博, 中坪孝之

    日本地球惑星科学連合2009年大会   (千葉) 

    発表年月: 2009年05月

  • 富士山火山荒原における一次遷移に伴う土壌微生物群集の変化:リン脂質脂肪酸を指標として

    吉竹晋平, 藤吉正明, 中坪孝之, 増沢武弘, 小泉博

    第56回日本生態学会大会   (盛岡) 

    発表年月: 2009年03月

  • Photosynthetic characteristics of biological soil crusts and effect of temperature increase in a High Arctic glacier foreland in Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, H. Koizumi, H. Kanda, T. Nakatsubo

    A3 Foresight program Gifu Sminar and 11th Takayama Seminar   (Gifu, Japan) 

    発表年月: 2009年02月

  • Photosynthetic characteristics of biological soil crusts in a High Arctic glacier foreland in Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, H. Koizumi, H. Kanda, T. Nakatsubo

    31st Symposium on Polar Meteorology and Glaciology, Polar Biology   (Tokyo, Japan) 

    発表年月: 2008年12月

  • 荒原生態系における土壌微生物群集の制限要因:海岸砂丘の土壌微生物に対する炭素・窒素制限

    吉竹晋平, 中坪孝之

    第55回日本生態学会大会   (福岡) 

    発表年月: 2008年03月

  • 荒原生態系における土壌微生物に対する制限要因:高緯度北極氷河後退域における炭素・窒素制限

    吉竹晋平, 内田雅己, 中坪孝之, 神田啓史

    日本地球惑星科学連合2007年大会   (千葉) 

    発表年月: 2007年05月

  • 海岸砂丘における植生の発達に伴う土壌微生物群集の変化:リン脂質脂肪酸を指標として

    吉竹晋平, 中坪孝之

    第54回日本生態学会大会   (愛媛) 

    発表年月: 2007年03月

  • Soil respiration in a High Arctic glacier foreland in Ny-Ålesund, Svalbard: Is it limited by low carbon and nitrogen availability?

    S. Yoshitake, M. Uchida, T. Nakatsubo, H. Koizumi, H. Kanda

    7th International Conference on Global Change: Connection to the Arctic (GCCA-7)   (Fairbanks, Alaska) 

    発表年月: 2007年02月

  • 荒原生態系における土壌微生物群集の制限要因:高緯度北極氷河後退域の土壌微生物に対する炭素・窒素制限

    吉竹晋平, 内田雅己, 菅尚子, 中坪孝之

    第53回日本生態学会大会   (新潟) 

    発表年月: 2006年03月

  • Factors limiting soil microbial biomass and respiration rate on a successional glacier foreland in the high Arctic, Ny-Ålesund, Svalbard

    S. Yoshitake, M. Uchida, N. Kan, T. Nakatsubo

    The 28th Symposium on Polar Biology   (Tokyo, Japan) 

    発表年月: 2005年12月

  • 北極エルズミア島氷河後退域におけるリン脂質脂肪酸を指標とした土壌微生物相の解析

    吉竹晋平, 内田雅己, 神田啓史, 中坪孝之

    第52回日本生態学会大会   (大阪) 

    発表年月: 2005年03月

  • Characterization of soil microflora on a successional glacier foreland in Ellesmere Island using phospholipid fatty acid analysis

    S. Yoshitake, M. Uchida, T. Nakatsubo, H. Kanda H

    Third international symposium on the arctic research and Seventh Ny-Alesund Scientific Seminar   (Tokyo, Japan) 

    発表年月: 2005年02月

  • 硫気荒原におけるリン脂質脂肪酸を指標とした土壌微生物群集構造の解析

    吉竹晋平, 中坪孝之

    第51回日本生態学会大会   (釧路) 

    発表年月: 2004年08月

  • 硫気荒原における有機物分解と微生物活性

    吉竹晋平, 佐々木晶子, 内田雅己, 船津勇一, 中坪孝之

    第50回日本生態学会大会   (つくば) 

    発表年月: 2003年03月

▼全件表示

共同研究・競争的資金等の研究課題

  • 海藻ブルーカーボンを活用したバイオチャーの作出と炭素隔離機能の検証

    日本学術振興会  科学研究費助成事業

    研究期間:

    2024年04月
    -
    2027年03月
     

    町田 郁子

  • 高緯度北極ツンドラ生態系のレジームシフト:炭素循環研究に基づく機構解明と将来予測

    日本学術振興会  科学研究費補助金(基盤研究B)

    研究期間:

    2022年04月
    -
    2027年03月
     

    中坪孝之

  • マングローブ林におけるベントス巣穴を介した溶存無機炭素流出の機構解明と定量評価

    日本学術振興会  科学研究費助成事業 基盤研究(C)

    研究期間:

    2023年04月
    -
    2026年03月
     

    吉竹晋平, 大塚俊之, 友常満利

  • 森林へのバイオチャー散布による炭素隔離効果:リター分解メカニズムの樹種間比較

    日本学術振興会  科学研究費補助金(基盤研究C)

    研究期間:

    2022年04月
    -
    2026年03月
     

    友常満利

  • 林地へのバイオ炭施用によるCO2放出の削減と生態系サービスの強化に関する研究

    環境再生保全機構  環境研究総合推進費

    研究期間:

    2022年04月
    -
    2025年03月
     

    吉竹晋平

  • バイオチャーが森林生態系の土壌圏と生態系炭素隔離機能に及ぼす中長期的影響の解明

    日本学術振興会  科学研究費補助金(基盤研究B)

    研究期間:

    2019年04月
    -
    2022年03月
     

    吉竹 晋平

  • 大気化学と先進的遺伝子解析の融合による森林生態系の温室効果気体動態評価の高精化

    日本学術振興会  科学研究費補助金(基盤研究B)

    研究期間:

    2018年04月
    -
    2021年03月
     

    村山 昌平

  • バイオチャーが森林生態系の有機物堆積層の構造と機能に与える影響

    日本学術振興会  科学研究費補助金(基盤研究C)

    研究期間:

    2018年04月
    -
    2021年03月
     

    友常 満利

  • 溶存有機炭素フラックスが森林生態系の土壌圏炭素動態と微生物群集に与える影響の解明

    日本学術振興会  科学研究費補助金(基盤研究C)

    研究期間:

    2016年04月
    -
    2019年03月
     

    吉竹 晋平

  • バイオチャーを用いた森林における炭素隔離効果と生態系応答機構の解明

    日本学術振興会  科学研究費補助金(基盤研究A)

    研究期間:

    2015年04月
    -
    2019年03月
     

    小泉 博

  • 植生遷移に伴う落葉広葉樹林生態系機能の環境応答特性の変遷とその変動機構の解明

    日本学術振興会  科学研究費補助金(基盤研究B)

    研究期間:

    2015年04月
    -
    2019年03月
     

    斎藤 琢

  • タイ王国トラート川河口マングローブ林における土壌生態学的研究

    日本学術振興会  科学研究費補助金(基盤研究B)

    研究期間:

    2015年04月
    -
    2018年03月
     

    大塚 俊之

  • 草原の落葉分解は冬と夏の温暖化によってどう変化するのか~複合型の野外温暖化操作実験を用いた検証~

    ニッセイ財団  環境問題研究助成

    研究期間:

    2015年10月
    -
    2016年09月
     

    吉竹 晋平

  • 生態系発達の初期過程における生産者・基質・分解者の関係性とその変化

    日本学術振興会  特別研究員奨励費

    研究期間:

    2009年04月
    -
    2012年03月
     

    吉竹晋平

     概要を見る

    昨年度までに火山荒原(富士山)の一次遷移初期および後期から採取した土壌を用いて基質添加実験を行ってきた。この基質添加実験では3種の炭素源(グルコース・セルロース・リグニン)と窒素源およびリン源を用いている。本年度はこの実験によって得られている土壌サンプルに対して、リン脂質脂肪酸分析を行って基質添加後の微生物バイオマスおよび群集構造の変化について調べた。
    その結果、一次遷移初期の土壌においては、炭素源・窒素源・リン源のいずれも単独の添加では変化は見られなかったが、炭素源を窒素源またはリン源と同時に添加することによって微生物バイオマスの増加および群集構造の変化が認められた。一方、遷移後期の土壌においては、易分解性炭素源であるグルコースについてのみ、炭素源の単独添加によっても微生物バイオマスが増加した。また、遷移初期土壌と同様に、炭素源を窒素源およびリン源と組み合わせて添加することにで、より大きなバイオマス増加や群集構造変化が起こることが示された。今回の添加実験で使用した遷移初期および後期のいずれの土壌に関しても、炭素源・窒素源・リン源を全て添加した際のバイオマス増加量は使用した炭素源の種類によって大きく異なっており、土壌微生物に対する基質制限には基質の「量」に加えて基質の「質」の違いが大きく影響することが明らかとなった。
    これまでに得られている火山荒原以外の荒原生態系の結果を合わせて考察すると、生態系発達の初期過程においては炭素源・窒素源・リン源がいずれも不足しており、このことが、遷移後期に比べて遷移初期において微生物バイオマスが少なく群集構造が異なっている一因であると考えられた。一方、遷移後期においては主に易分解性炭素源の不足によって微生物の増殖などが抑制されている可能性が示された。同時に、遷移後期では窒素源やリン源の不足は二次的な制限要因であることが示唆された。

  • 急速な氷河後退に伴う北極陸上生態系の炭素シーケストレーションの 長期変動と将来予測

    日本学術振興会  科学研究費助成事業

    研究期間:

    2008年
    -
    2011年
     

    中坪 孝之, 内田 雅己, 奈佐原 顕郎, 村岡 裕由, 大塚 俊之, 岸本 文紅, 神田 啓史, 本岡 毅, 林 健太郎, 和田 直也, 平尾 章, 佐々木 晶子, 藤吉 正明, 吉竹 晋平, 内田 雅己

     概要を見る

    本研究は、急速な氷河後退が進行している高緯度北極を対象に、炭素循環モデルと衛星リモートセンシング技法とを組み合わせることにより、炭素循環過程、炭素シーケストレーションの時間変化の解明をめざしたものである。スバールバル諸島ニーオルスンの氷河後退域において、土壌炭素の広域分布、過去から現在までの氷河後退過程、氷河後退域への植物の定着に関する調査を行い、それらの結果をふまえ、炭素循環モデルによる炭素循環・炭素シーケストレーションの将来予測を行った。

  • 生態系発達の初期過程における土壌微生物群集の成立とその制限要因

    日本学術振興会  特別研究員奨励費

    研究期間:

    2007年04月
    -
    2008年03月
     

    吉竹 晋平

     概要を見る

    本年度は、1.火山噴火後に成立する火山荒原において、一次遷移に伴って土壌微生物のバイオマスや群集構造の変化を明らかにすること、2.高緯度北極氷河後退域に見られる寒地荒原の一次遷移初期において、藻類やコケ、地衣などから成る土壌クラストの光合成特性および生産量と、温暖化がそれらに及ぼす影響を明らかにすることを目的とした。
    1.富士山南東側斜面の一次遷移系列に沿って土壌を採取し、リン脂質脂肪酸を指標として土壌微生物のバイオマスおよび群集構造を解析した。その結果、微生物バイオマスの指標である全リン脂質脂肪酸量は土壌有機物量と非常に高い正の相関を示したことから、土壌微生物バイオマスの増加には基質である土壌有機物の蓄積が重要である可能性が示唆された。一方、土壌微生物の群集構造の指標であるリン脂質脂肪酸組成は、裸地への先駆植物の侵入する段階や草本から木本へと植生タイプが変化する段階で大きく変化していたことから、リターや土壌有機物の質的な変化が微生物群集構造に影響を及ぼしている可能性が示された。
    2.スピッツベルゲン島ニーオルスンの氷河後退域から採取した土壌クラストを用いて、様々研な水分・温度・光条件下での光合成・呼吸速度を測定したところ、土壌クラストの光合成速度は温度上昇に非常に敏感に反応して減少することが明らかとなった。次に上記で求めた関係性からモデルを構築し、実際の野外の気象データから純一次生産量を推定したところ、その値は非常に小さかった。モデルにおいて現在の温度+3℃および+6℃条件での純一次生産量をシミュレーションしたところ、クラストの純一次生産量は温暖化によって激減する可能性が示された。
    本年度で得られた成果は、研究例の少ない荒原生態系において生産者(植生)・基質(土壌有機物)・分解者(土壌微生物群集)のそれぞれの変化を相互に関連付けて考える上で非常に重要であると考えられる。

▼全件表示

Misc

  • 気候変動と高緯度北極陸上生態系 ―炭素循環過程を中心に―

    中坪孝之, 内田雅己, 村岡裕由, 野田響, 吉竹晋平, 内田昌男

    月刊地球   30 ( 5 ) 240 - 250  2008年07月

    記事・総説・解説・論説等(学術雑誌)  

    CiNii

 

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    2023年   月本将太郎

     概要を見る

     沖縄県石垣島の小規模マングローブにおける炭素循環の解明のためには、堆積物中の有機物の分解によって生成・放出される溶存無機炭素(DIC)の生成メカニズムや流出経路を明らかにすることが重要であると考えられた。本研究では当初有機物分解プロセスそのものに焦点を当てて実験を行う予定であったが、現地の堆積物に見られる非常に高い空間的不均一性、すなわち底生生物(ベントス)の造巣行動によって作られる巣穴が多数点在することが、有機物分解の結果生じるDICの河川・海洋への流出に大きな影響を与えると思われた。そのため研究計画を一部変更・発展させ、現地における底生生物による巣穴の基礎的な情報を取得すること、そしてその巣穴内部へのDIC流出過程の解明を試みた。 石垣島のマングローブ林において、樹脂をカニ穴に流し込むことでその型取りを行い、その形状や体積、表面積を解析した。その結果、入り口の直径がわずか2–3 cmの巣穴であっても、地下部には表面積で3,600–4,900 cm2、体積で1,400–2,500 cm3もの空間が広がっていることが明らかとなった。また、生物種によって巣穴の形状は異なっていた。インターバルカメラを用いて地表面に多数存在するこれらの巣穴を注意深く観察したところ、約40%の巣穴では潮位変動に同期して巣穴内部の水面が上下していたが、残りの約60%の巣穴では単純に潮位変動に応じて上下するのではなく、上げ潮時に地表面に満ちてきた海水が巣穴上部から流れ込む様子が見られた。また、巣穴内部の水を経時的に採取してDIC濃度を分析したところ、DIC濃度が時間とともに増加する様子が確認できた。これらの結果から、干潮時においてもベントス巣穴内部に海水が滞留し、そこに巣穴の壁面を介して堆積物中の高濃度DICが巣穴内部の水に放出され、それが満潮時に河川や海洋に流出する可能性が強く示唆された。

  • 亜熱帯マングローブ林からの海洋への物質流出過程に関する研究

    2022年   伊藤河聞

     概要を見る

    石垣島の小規模マングローブ流域において、河口部での河川断面積の測定と経時的な水位および流量測定を行い、これらをもとに河川流量の算出を試みたが、現場の河口部底質は砂質であったため、地中を通って流出する河川水の定量は困難であることが明らかとなった。そこで本研究課題では、河口部で採取した水試料を分析し、河口から海洋に向けて流出する溶存態有機炭素・無機炭素の濃度情報を取得した。また、域内から堆積物サンプルを採取し、室内実験によって有機物分解速度を測定した。その結果、海水に覆われる冠水条件下でも有機物分解が進行していること、無視できない量の溶存無機炭素が水中に放出されることが明らかとなった。

  • マングローブ林における有機物分解過程の解明

    2021年   伊藤

     概要を見る

    マングローブ林における有機物無機化速度を明らかにするため、林内の堆積物を採取し、一般的物理化学性の分析と、干出時(通気法)および冠水時(水中密閉法)における無機態炭素放出速度の測定を行った。干出時の無機化速度は有機物含量やシルト含量が高い場所で大きく、冠水時における溶存無機炭素(DIC)の生成速度は、有機物含量や含水率が高い川沿いの地点で大きかった。マングローブから沿岸に流出する炭素量を推定するため、河口部でDICと溶存有機炭素(DOC)濃度を測定したところ、いずれも干潮時に大きく増加しており、マングローブ域から多くの溶存炭素が海洋へ輸送されていることが示された。

  • 森林生態系における土壌微生物群集特性の空間的不均一性の解明

    2020年   西貝竜太

     概要を見る

    森林における土壌微生物群集の空間的不均一性の原因の1つには、植物から供給されて微微生物の基質となる有機物の量や質が空間的に不均一であることが挙げられる。本研究では、鉱質土壌に供給される有機物として特に樹幹流等に含まれる溶存有機態炭素(DOC)に着目し、それらが微生物群集に及ぼす影響について調べた。野外で採取した樹幹流等を実験室内で土壌に添加し、微生物呼吸や窒素無機化速度などの応答を調べたところ、樹幹流またはリター滲出液、あるいは樹種によって微生物群集は異なる応答を示したことから、森林内での樹木位置や樹種の違いが、DOC供給を介して土壌微生物群集の空間的不均一性に寄与している可能性が示唆された。

  • 植物根呼吸の日変化とその変動要因の解明

    2019年   今吉健斗

     概要を見る

    根呼吸は採取した根をチャンバーに入れて実験室で測定されることが多いが、この方法では地上部との連携を無視しているという問題があった。本研究では非切断根の連続測定法について検討を行った。まず野外で非切断根の呼吸を測定する方法を検討したが、多くの技術的課題により連続測定を行えるには至らなかった。そこで、実験室環境下でモデル植物の非切断細根の連続測定を試み、光・温度環境への根呼吸の応答性解明を行った。その結果、実験室環境下では非切断細根の連続測定が可能であり、その根呼吸が光強度に対して明瞭に応答することが示された。今後はこのシステムを用いて野外植物の根呼吸の連続測定を実施する予定である。