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Quantifying effects of plant root growth on soil thermal properties and developing in-situ plant root density measurement

Research Project

Project/Area Number 21K14940
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 41030:Rural environmental engineering and planning-related
Research InstitutionGifu University

Principal Investigator

Kojima Yuki  岐阜大学, 工学部, 准教授 (70767475)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords植物根 / 土壌構造 / 熱輸送特性 / X線CTスキャン / 土壌特性 / X線CT / 土壌 / 熱輸送 / 画像解析 / 土壌熱輸送特性 / 土壌の熱輸送特性 / サーモTDRセンサ
Outline of Research at the Start

気候変動による土壌環境変化を考える際,土壌の熱輸送特性が重要となる.地表面近傍土壌では植物根の生長により土壌構造が変化し,熱輸送特性が複雑に変化すると考えられる.そこで本研究では根の生長と土壌構造および熱輸送特性の関係について,様々な植物と土壌の組み合わせを用いて評価し,根の生長を考慮した熱輸送モデルを構築する.また,土壌の熱輸送特性センサを用いて,植物根量の原位置測定法を開発する.

Outline of Final Research Achievements

We measured the heat transport properties of root-mixed soil using sensors to elucidate the effects of plant roots on soil structure and heat transport. The impact of different combinations of plants and soils was examined. In addition, we visualized root-mixed soil using X-ray computed tomography. Sensor measurements showed that the growth of plant roots tended to make the soil denser and increase the soil's heat transport properties. In contrast, in kuroboku soil, root growth decreased the soil bulk density and did not change the heat transport properties. In observing root-mixed soil using X-ray CT, we developed a method for extracting plant roots from CT images and successfully analyzed plant roots, soil particles, pore water, and pore air. Important results were obtained to accelerate research on plant roots and soils.

Academic Significance and Societal Importance of the Research Achievements

植物根が土壌に与える影響は多岐にわたり,その中で土壌の熱輸送に与える影響を解明することは,土壌の炭素固定や生態系保全等において重要である.本研究では複数種の植物が複数の土壌の熱輸送特性に与える影響を定量的に評価した.また根混じり土壌のX線CT画像から根を抽出し,土粒子,水,空気の分節化を実現した.これは土壌の熱輸送研究のみでなく,様々な植物根関連研究に展開可能であり,重要な成果が得られた.

Report

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

    (14 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Climate change impacts on soil moisture and temperature in the plain and mountainous regions of Gifu Prefecture, Japan2023

    • Author(s)
      Asano, J, Y. Kojima, C. Kato, K. Kamiya
    • Journal Title

      IOP Conf. Ser.: Earth Environ. Sci.

      Volume: 1165 Issue: 1 Pages: 012045-012045

    • DOI

      10.1088/1755-1315/1165/1/012045

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A four-parameter-based thermo-TDR approach to estimate water and NAPL contents of soil liquid2023

    • Author(s)
      Kojima, Y, K. Okumura, S. Aoki, K. Noborio, K. Kamiya, R. Horton
    • Journal Title

      Geoderma

      Volume: 429 Pages: 116263-116263

    • DOI

      10.1016/j.geoderma.2022.116263

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A dual-probe heat pulse-based sensor that simultaneously determines soil thermal properties, soil water content and soil water matric potential2021

    • Author(s)
      Kojima Yuki、Kawashima Tomoyuki、Noborio Kosuke、Kamiya Kohji、Horton Robert
    • Journal Title

      Computers and Electronics in Agriculture

      Volume: 188 Pages: 106331-106331

    • DOI

      10.1016/j.compag.2021.106331

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Estimating fine bubble concentration in water with a time domain reflectometry2021

    • Author(s)
      谷川原龍之介,小島悠揮,濱本昌一郎,神谷浩二
    • Journal Title

      Journal of the Japanese Society of Soil Physics

      Volume: 149 Issue: 0 Pages: 47-53

    • DOI

      10.34467/jssoilphysics.149.0_47

    • NAID

      130008143232

    • ISSN
      0387-6012, 2435-2497
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Visualizing plant root distribution and its interaction with soil constituents using X-ray computed tomography2023

    • Author(s)
      Toda, T., Y. Kojima, S. Hamamoto, Y. Ohtake, and K. Kamiya
    • Organizer
      JpGU Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 土壌環境の将来予測における土壌水理・熱特性推定法の検討2023

    • Author(s)
      浅野珠里, 小島悠揮, 加藤千尋, 鈴木拓実, 神谷浩二
    • Organizer
      農業農村工学会2023年度大会講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] GCMのバイアス補正が土壌水分量と地温の将来予測に与える影響2023

    • Author(s)
      鈴木拓実, 小島悠揮, 加藤千尋, 浅野珠里, 神谷浩二
    • Organizer
      農業農村工学会2023年度大会講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 地表面アルベド制御による将来的な地温上昇抑制効果の数値解析的評価2023

    • Author(s)
      鈴木拓実, 小島悠揮, 浅野珠里, 坂井勝, 加藤千尋, 神谷浩二, Robert Horton
    • Organizer
      2023年度土壌物理学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 汚染履歴が異なる油汚染土壌の水理特性と土中油分存在形態との関連性評価2023

    • Author(s)
      谷川原龍之介, 小島悠揮, 濱本昌一郎, 大竹豊, 神谷浩二
    • Organizer
      2023年度土壌物理学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Climate change impacts on soil moisture and temperature of plain and mountainous regions in Gifu Prefecture, Japan2022

    • Author(s)
      Juri Asano, Yuki Kojima, Chihiro Kato, Kohji Kamiya
    • Organizer
      The 8th International Conference on Climate Change
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] GCMの選択が岐阜県平野部および山間部の土壌環境将来予測に与える影響2022

    • Author(s)
      浅野珠里, 小島悠揮, 加藤千尋, 鈴木拓実, 神谷浩二
    • Organizer
      農業農村工学会2022年度大会講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Predicting climate change impacts on soil environment in plain and mountainous areas of Gifu Prefecture, Japan2022

    • Author(s)
      Asano, J, Y. Kojima, C. Kato, K. Kamiya
    • Organizer
      JpGU Meeting 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 植物根が土壌の電気特性および熱特性に与える影響の解明2021

    • Author(s)
      小田奈苗,小島悠揮,神谷浩二
    • Organizer
      農業農村工学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Evaluating effects of plant roots on soil thermal properties with a thermo-TDR sensor2021

    • Author(s)
      Oda, N., Kojima, Y., Kamiya, K.
    • Organizer
      Japan Geoscience Union
    • Related Report
      2021 Research-status Report

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

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