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Large-scale prediction of organic matter decomposition potential using machine learning and field decomposition data of tea-bag and chotsticks

Research Project

Project/Area Number 19K15879
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40010:Forest science-related
Research InstitutionForest Research and Management Organization

Principal Investigator

Mori Taiki  国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員 等 (90749095)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords有機物分解 / 気候変動 / 機械学習 / ティーバッグ法 / ティーバッグインデックス / 炭素循環 / ティーバッグ / ランダムフォレスト / 割り箸 / マッピング / 広域評価
Outline of Research at the Start

森林において、落葉落枝等の堆積有機物(以下リター)がどれほどの速度で分解するのかについては、これまで十分に明らかにされてこなかった。その理由のひとつに、実験用の均質なリターを大量に準備するのが困難であった事が挙げられる。本研究は、均質な標準物質としてティーバッグ・割り箸を利用することで、大量の分解速度データの取得を可能とする。得られた大量のデータを、近年発達している機械学習を利用して解析し、日本全国のリター分解速度のマップを作成する。

Outline of Final Research Achievements

A prediction model for tea bag decomposition rate was established using the random forest method. Additionally, a modification was proposed to improve the prediction accuracy of the tea bag index (TBI) approach, which is a standard method for assessing litter decomposition. These contributions help to improve the robustness of the impact assessment of soil organic matter decomposition under climate change. Furthermore, we accumulated basic data on the effect of soil water on the decomposition rate of tea bags, revealing that the effect of soil moisture on tea bag decomposition rate is nonlinear. We also demonstrated through field fertilization experiments that carbon addition accelerates tea bag decomposition more than nutrient addition.

Academic Significance and Societal Importance of the Research Achievements

ランダムフォレスト法によるティーバッグ分解速度予測モデルを作成したところ、平均気温、降水量、日射量、相対湿度が上昇するほど、また、標高、傾斜、Topographic Position Indexが低下するほどティーバッグの分解が速くなるという従来の知見と調和的な結果が得られ、機械学習によるリター分解速度予測マップ作成が十分可能であることが明らかになった。これは炭素排出量の算定方法改善に貢献する。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (3 results)

  • [Int'l Joint Research] Environment Agency Austria(オーストリア)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Risk of misinterpreting the Tea Bag Index: Field observations and a random simulation2022

    • Author(s)
      Mori Taiki、Nakamura Ryosuke、Aoyagi Ryota
    • Journal Title

      Ecological Research

      Volume: 37 Issue: 3 Pages: 381-389

    • DOI

      10.1111/1440-1703.12304

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Validation of the Tea Bag Index as a standard approach for assessing organic matter decomposition: a laboratory incubation experiment.2022

    • Author(s)
      MORI Taiki
    • Journal Title

      Ecological Indicators

      Volume: 141 Pages: 109077-109077

    • DOI

      10.1016/j.ecolind.2022.109077

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Can nonwoven tea bags determine the Tea Bag Index?2022

    • Author(s)
      MORI Taiki
    • Journal Title

      Ecologies

      Volume: 3 Issue: 2 Pages: 175-182

    • DOI

      10.3390/ecologies3020014

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Is the Tea Bag Index (TBI) useful for comparing decomposition rates among soils?2022

    • Author(s)
      MORI Taiki
    • Journal Title

      Ecologies

      Volume: 3 Issue: 4 Pages: 521-529

    • DOI

      10.3390/ecologies3040038

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Tea Bags-Standard Materials for Testing Impacts of Nitrogen Addition on Litter Decomposition in Aquatic Ecosystems?2021

    • Author(s)
      Mori Taiki
    • Journal Title

      Nitrogen

      Volume: 2 Issue: 2 Pages: 259-267

    • DOI

      10.3390/nitrogen2020017

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of Water Content and Mesh Size on Tea Bag Decomposition2021

    • Author(s)
      Mori Taiki、Aoyagi Ryota、Taga Hiroki、Sakai Yoshimi
    • Journal Title

      Ecologies

      Volume: 2 Issue: 1 Pages: 175-186

    • DOI

      10.3390/ecologies2010010

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ティーバッグ法による有機物分解速度推定は妥当なのか?2022

    • Author(s)
      森大喜
    • Organizer
      日本森林学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ティバッグの分解にメッシュサイズと土壌含水率が与える影響2021

    • Author(s)
      森大喜、青柳亮太、多賀洋輝、酒井佳美
    • Organizer
      日本森林学会
    • Related Report
      2020 Research-status Report
  • [Presentation] ランダムフォレストとティーバッグを用いた気候変動による有機物分解速度の変化予測2020

    • Author(s)
      森大喜, 酒井佳美, 鳥山淳平, 橋本徹, 伊藤江利子, 梅村光俊, 石塚成宏, 橋本昌司, 山下尚之, 青柳亮太,多賀洋輝
    • Organizer
      日本森林学会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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