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Assessment of Enhanced Climate Change Resilience through Carbon Sequestration in Tropical Soils

Research Project

Project/Area Number 22K20585
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0602:Agricultural and environmental biology and related fields
Research InstitutionJapan International Research Center for Agricultural Sciences

Principal Investigator

Shinya Iwasaki  国立研究開発法人国際農林水産業研究センター, 農村開発領域, 任期付研究員 (40915261)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords土壌炭素 / 畑土壌肥沃度 / 気候変動レジリエンス / キャッサバ / 土壌炭素貯留 / 長期連用試験 / 土壌肥沃度 / 畑土壌 / 極端気象 / 畑作物
Outline of Research at the Start

応募者の所属する国際農林水産業研究センターではタイ農業局と連携し、タイ国内の6地点で40年を超える長期連用試験を実施し、有機物施用を含む営農管理が土壌炭素貯留と作物収量に与える影響を追跡してきた。本研究では、新たに長期連用試験圃場において土壌を網羅的に採取し、土壌物理・化学・生物性の変化を解析することで、炭素貯留と土壌肥沃度の向上との関係を明らかにするとともに、多変量解析によって作物生育を規定する土壌因子を抽出し、熱帯農地における土壌肥沃度の指標を創出する。そして極端気象下での土壌炭素貯留量と作物収量の関係に注目し解析することで、土壌炭素貯留による気候変動レジリエンスの向上への影響を評価する。

Outline of Final Research Achievements

The objective of this study was to understand soil physico-chemical changes through comprehensive soil analysis and to evaluate the improvement of climate change resilience through carbon sequestration in a long-term continuous use study over 45 years in Thailand. Differences in soil physical properties, such as soil structure and the vertical distribution of soil carbon, were identified among the different management practices. Structural equation modeling was used to visualize the interactions among the effects of different management practices on soil carbon sequestration, soil physicochemical properties, and crop yield. It was found that water and nutrient retention functions derived from soil organic matter were more dominant in sandy soils than in clay soils and that crop yield was relatively enhanced by soil carbon sequestration. The results were reported at domestic and international conferences and submitted as an original paper.

Academic Significance and Societal Importance of the Research Achievements

国際的に炭素排出量の低減がうたわれるなか、土壌炭素貯留への期待も高まっている。しかしながら高温多湿環境により、土壌有機物分解が卓越する湿潤熱帯地域において、温帯や亜寒帯を中心に進んできた炭素動態メカニズムをそのまま適用することはできない。熱帯では最大規模の長期連用試験をもとに炭素貯留量の算定と作物生産への影響を示した本研究の意義は大きい。また、土壌型によって、有機物施用による土壌炭素貯留速度および土壌炭素が肥沃度向上に与える影響が異なることが明らかになったことは、土壌炭素動態モデルの構築に大きく寄与する。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (4 results)

All 2023 Other

All Int'l Joint Research (2 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] タイ農業局(タイ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] タイ農業局(タイ)

    • Related Report
      2022 Research-status Report
  • [Presentation] Four Decades of Organic Matter Application in Sandy Soils: Effects on Carbon Sequestration and Vertical Infiltration in Thailand2023

    • Author(s)
      Somrutai Tancharoen, Shinya Iwasaki*, Takeshi Watanabe , Suphakarn Luanmanee , Wanida Nobuntou, Wanlee Amonpon, Netirat Chumsuwan, Kobkiet Paisancharoen, Saowaree Bumrunge, Naruo Matsumoto
    • Organizer
      Global Conference Sandy Soils
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中央タイのトウモロコシ圃場における耕起方法と肥培管理が土壌炭素および理化学性に与える影響2023

    • Author(s)
      岩崎真也、Somrutai Tancharoe、Suphakarn Luanmanee、Wanida Nobuntou、松本成夫
    • Organizer
      日本土壌肥料学会
    • Related Report
      2023 Annual Research Report

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Published: 2022-09-01   Modified: 2025-01-30  

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