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Invasive plants alter water resources and soil conservation functions in Hawaii forested watersheds

Research Project

Project/Area Number 20KK0140
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 40:Forestry and forest products science, applied aquatic science, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Kumagai Tomo'omi  東京大学, 大学院農学生命科学研究科(農学部), 教授 (50304770)

Co-Investigator(Kenkyū-buntansha) 堀田 紀文  東京大学, 大学院農学生命科学研究科(農学部), 准教授 (00323478)
宮沢 良行  九州大学, キャンパス計画室, 学術推進専門員 (80467943)
江草 智弘  静岡大学, 農学部, 助教 (90829897)
Project Period (FY) 2020-10-27 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2022: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2021: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords水源涵養機能 / 森林 / 水循環 / 侵略的外来植物
Outline of Research at the Start

最終目的は「ハワイ諸島において、侵略的外来植物キバンジロウの逸出により劣化した森
林流域の水源涵養機能を取り戻す方策に貢献する」である。本研究課題における研究目的は、その最終目的に到達するための目標として基礎研究「外来植物が在来植物を駆逐していく中で原植生が持っていた水源涵養機能が劣化していく過程のメカニズムを解明する」を遂行し、ハワイ諸島だけでなく世界中で進行する侵略的外来種問題・生態系サービス低下問題の対策のための基礎情報を提供することである。

Outline of Final Research Achievements

The original plan was to conduct synthesized analyses on forest water resources impacted by invasive exotic plants with several experimental forested watersheds over the Hawaii Islands. However, it was impossible to conduct observations and data analysis of Hawaiian forest water resources because of the worldwide COVID situation. Under such a situation, we (1) were successful in developing a brilliant forest water cycling simulator, BLADE, (2) conducted fine time and space resolution data of soil moisture, bedrock structure, and canopy structure to validate the BLADE, (3) suggested that the BLADE can evaluate the forest function of stable water resources, especially, at low flow periods with high quality.

Academic Significance and Societal Importance of the Research Achievements

植生変化、気候変動など、森林の水源涵養機能を変え得る要因は、様々であるが、その定量的評価は全く不十分である。その原因は、森林流域の水文特性を精緻に記述できる機構論的モデルの欠如と、たとえ、それが完成したとしても、その正当性確認ができるほどの高時空間解像度観測を入手することの困難性にあった。本研究では、新機軸で開発された森林水循環シミュレータBLADEと、これまで長きに渡り水文観測が行われてきた水文試験地に高度観測システムを投入することで、これまでにないレベルでの森林水源涵養機能の評価が可能となった。このことは、社会的には、森林の公益的機能を理論的に世に示すことに寄与するものである。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2023 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 9 results)

  • [Int'l Joint Research] ハワイ大学(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Forest canopy interception can reduce flood discharge: Inferences from model assumption analysis.2023

    • Author(s)
      Momiyama, H., Kumagai, T., Fujime, N., Egusa, T. and Shimizu, T.
    • Journal Title

      Journal of Hydrology

      Volume: 623 Pages: 129843-129843

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Implications of seasonal changes in photosynthetic traits and leaf area index for canopy CO2 and H2O fluxes in a Japanese cedar (Cryptomeria japonica D. Don) plantation2023

    • Author(s)
      Hata, Y., Kumagai, T., Shimizu, T. and Miyazawa, Y.
    • Journal Title

      Ecological Modelling

      Volume: 477 Pages: 110271-110271

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of bedrock groundwater discharge on spatial variability of dissolved carbon, nitrogen, and phosphorous concentrations in stream water within a forest headwater catchment2021

    • Author(s)
      Egusa, T., Kumagai, T., Oda, T. and Ohte, N.
    • Journal Title

      Hydrological Processes

      Volume: 35

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Estimation of sub-annual inter-catchment groundwater flow using short-term water balance method2021

    • Author(s)
      Egusa, T., Oda, T., Sato, T. and Kumagai, T.
    • Journal Title

      Hydrological Processes

      Volume: 35

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Importance of calibration in determining forest stand transpiration using the thermal dissipation method2021

    • Author(s)
      Fujime, N., Kumagai, T., Egusa, T., Momiyama, H. and Uchiyama, Y.
    • Journal Title

      Agricultural and Forest Meteorology

      Volume: 301-302 Pages: 108356-108356

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Model analysis of forest thinning impacts on the water resources during hydrological drought periods2021

    • Author(s)
      Momiyama, H., Kumagai, T. and Egusa, T.
    • Journal Title

      Forest Ecology and Management

      Volume: 499 Pages: 119593-119593

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of bedrock groundwater discharge on spatial variability of dissolved carbon, nitrogen, and phosphorous concentrations in stream water within a forest headwater catchment.2021

    • Author(s)
      Egusa, T., Kumagai, T., Oda, T. and Ohte, N.
    • Journal Title

      Hydrological Processes

      Volume: 35

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Importance of calibration in determining forest stand transpiration using the thermal dissipation method.2021

    • Author(s)
      Fujime, N., Kumagai, T., Egusa, T., Momiyama, H. and Uchiyama, Y.
    • Journal Title

      Agricultural and Forest Meteorology

      Volume: 301-302 Pages: 108356-108356

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Homogenization of the terrestrial water cycle.2020

    • Author(s)
      Levia, D. F., Creed, I....., Kumagai, T., .... and Bruen, M.
    • Journal Title

      Nature Geoscience

      Volume: 13 Pages: 656-658

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research

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Published: 2020-10-29   Modified: 2025-01-30  

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