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Increased moisture fluctuation and priming effect: Impact assessment for advancing the prediction of forest soil carbon dynamics

Research Project

Project/Area Number 21H02231
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 40010:Forest science-related
Research InstitutionNiigata University

Principal Investigator

Nagano Hirohiko  新潟大学, 自然科学系, 助教 (40758918)

Co-Investigator(Kenkyū-buntansha) 小嵐 淳  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 原子力基礎工学研究センター, 研究主席 (30421697)
平舘 俊太郎  九州大学, 農学研究院, 教授 (60354099)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2021: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Keywords土壌炭素動態 / 水分変動 / プライミング効果 / 火山灰土壌 / 気候変動 / 土壌有機物分解 / 降水パターン / 気象激甚化
Outline of Research at the Start

地球温暖化は、降水パターンをも変化させ、多量の炭素を貯留する森林土壌の水分変動を大きく増大させる可能性がある。その結果、土壌に隔離されている難分解性有機物の分解を促進するプライミング効果が発現し、土壌のCO2放出が爆発的に増大する可能性がある。一方、プライミング効果により微生物代謝が変化するなどして、CO2放出が減少する可能性もある。本研究では、参画する各研究者が得意とする研究手法を組み合わせつつ、水分変動増大環境を模した培養実験を複数の森林土壌に対し実施する。水分変動増大に伴う土壌CO2放出の変化量評価やプライミング効果のメカニズム解明を通じ、森林土壌における炭素動態予測の改善に貢献する。

Outline of Final Research Achievements

Ten soils collected from forests and grasslands in Japan were incubated under wet-dry cycle conditions (DWC) that simulated increased moisture fluctuations, in an attempt to elucidate the phenomenon of soil CO2 release increase. In all soils, the CO2 release rate in the DWC treatment was greater than that in the control treatment with no moisture fluctuations. However, in high-temperature conditions, the increase in CO2 release due to the DWC was mitigated, and Q10 tended to decrease. The abundance of organo-metal complexes in the soil was suggested as a soil physicochemical property that predicts differences in the increased rate of CO2 release among soils. A decrease in microbial biomass due to increased moisture fluctuations was also suggested. These soil physicochemical properties may be related to the reduction of Q10 for soil organic matter decomposition and the occurrence of the priming effect suggested by this.

Academic Significance and Societal Importance of the Research Achievements

これまで土壌炭素濃度を高める働きがあるとして注目されてきた金属-有機物複合体について、水分変動増大環境に対する脆弱性を示唆できた点において、本研究成果は独自性が高く、森林土壌の炭素動態予測高度化に対しても大きな意義を有している。また、乾湿サイクル条件における有機物分解の温度感受性(Q10)の低下も興味深い。本研究成果により、炭素動態予測モデルやこうしたモデルに基づいた地球環境変化の将来予測に潜む不確実性の低減につながることが期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (16 results)

All 2023 2022

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (15 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results)

  • [Journal Article] Stable C and N isotope abundances in water-extractable organic matter from air-dried soils as potential indices of microbially utilized organic matter2023

    • Author(s)
      Nagano Hirohiko、Atarashi-Andoh Mariko、Tanaka Sota、Yomogida Takumi、Kozai Naofumi、Koarashi Jun
    • Journal Title

      Frontiers in Forests and Global Change

      Volume: 6 Pages: 1228053-1228053

    • DOI

      10.3389/ffgc.2023.1228053

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Moderately elevated nitrogen deposition altering soil carbon dynamics2023

    • Author(s)
      Nagano, Hirohiko; Nakayama, Masataka; Katata, Genki; Fukushima, Keitaro; Yamaguchi, Takashi; Watanabe, Makoto; Atarashi-Andoh, Mariko; Tateno, Ryunosuke; Hiradate, Syuntaro; Koarashi, Jun
    • Organizer
      Acid Rain 2020
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水分変動増大がもたらす表層土壌の二酸化炭素放出増大:火山灰土壌と非火山灰土壌2023

    • Author(s)
      永野 博彦; 鈴木 優里; 平舘 俊太郎; 安藤 麻里子; 小嵐 淳
    • Organizer
      日本土壌肥料学会2023年度愛媛大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Exploring Predictors for Increase in Soil CO2 Release by Dry-Wet Cycles2023

    • Author(s)
      Nagano, Hirohiko; Suzuki, Yuri; Hiradate, Syuntaro; Atarashi-Andoh, Mariko; Koarashi, Jun
    • Organizer
      AGU Annual Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Soil Microbial Fluctuation and CO? Release Increase under Dry-Wet Cycles2023

    • Author(s)
      Suzuki, Yuri; Nagano, Hirohiko; Hiradate, Syuntaro; Atarashi-Andoh, Mariko; Abe, Yukiko; Koarashi, Jun; Nakayama, Masataka
    • Organizer
      AGU Annual Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水分変動増大が土壌微生物に及ぼす影響:国内6ヶ所10土壌による検証2023

    • Author(s)
      鈴木 優里; 永野 博彦; 平舘 俊太郎; 安藤 麻里子; 阿部 有希子; 中山 理智; 小嵐 淳
    • Organizer
      日本農業気象学会関東甲信越支部2023年度例会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Input of nitrogen suppresses soil respiration but promotes dissolved organic carbon release in a non-allophanic Andosol.2023

    • Author(s)
      Xiaodong Chen, Eri Yamakita, Yuki Mori, Anna Gunina, Syuntaro Hiradate
    • Organizer
      日本土壌肥料学会講演要旨集第69集, p. 19.
    • Related Report
      2023 Annual Research Report
  • [Presentation] Optimization of soil dissolved organic carbon (DOC) extraction from a non-allophanic Andosol with long-term fertilization.2023

    • Author(s)
      Xiaodong Chen, Eri Yamakita, Yuki Mori, Anna Gunina, Syuntaro Hiradate
    • Organizer
      The 10th EAFES International Congress (2023年東アジア生態学連合(EAFES)), PA8-003 (July 19, 2023). The Best Award (最優秀ポスター発表賞)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 水分変動増大がもたらす表層土壌の二酸化炭素放出増大: 高温環境における鈍化2023

    • Author(s)
      永野 博彦、鈴木 優里、神田 裕貴、平舘 俊太郎、安藤 麻里子、小嵐 淳
    • Organizer
      日本農業気象学会 2023年全国大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 水分変動増大がもたらす表層土壌の二酸化炭素放出増大: 規定因子の探索2023

    • Author(s)
      鈴木 優里、永野 博彦、神田 裕貴、平舘 俊太郎、安藤 麻里子、小嵐 淳
    • Organizer
      日本農業気象学会 2023年全国大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 土壌炭素動態推定手法としての風乾土壌の水抽出有機物2023

    • Author(s)
      永野 博彦、鈴木 優里、平舘 俊太郎、安藤 麻里子、小嵐 淳
    • Organizer
      第70回日本生態学会大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Dry soil rewetting for elucidating soil organic matter decomposition and carbon dynamics2023

    • Author(s)
      Hirohiko Nagano
    • Organizer
      KAAB International Symposium 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Rewetting dried soils for elucidating SOM dynamics in andic soils of a Japanese temperate forest2022

    • Author(s)
      Hirohiko Nagano, Mariko Atarashi-Andoh, Sota Tanaka, Syuntaro Hiradate, Kazumichi Fujii, Jun Koarashi
    • Organizer
      8th International Symposium on Soil Organic Matter: SOM 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stable carbon and nitrogen isotopes in water-extractable organic matter from air-dried soils to elucidate microbial utilization of substrate organic matter in a Japanese temperate forest2022

    • Author(s)
      Hirohiko Nagano, Mariko Atarashi-Andoh, Sota Tanaka, Jun Koarashi
    • Organizer
      Japan Geoscience Union Meeting 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 風乾土壌から水抽出した有機物の安定同位体分析による土壌有機物分解動態の推定2022

    • Author(s)
      永野 博彦、田中 草太、安藤 麻里子、小嵐 淳
    • Organizer
      日本土壌肥料学会 2022年度東京大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 水分変動増大が土壌の二酸化炭素放出に及ぼす影響: 国内6カ所10土壌の培養実験による検証2022

    • Author(s)
      鈴木 優里、永野 博彦、神田 裕貴、平舘 俊太郎、安藤 麻里子、小嵐 淳
    • Organizer
      日本農業気象学会 関東甲信越支部2022年度例会
    • Related Report
      2022 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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