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How devastated coniferous plantations negatively affect the environment and how this problem can be remedied?

Research Project

Project/Area Number 19H03088
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 41050:Environmental agriculture-related
Research InstitutionKyushu University

Principal Investigator

OTSUKI KYOICHI  九州大学, 農学研究院, 教授 (80183763)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2021: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords人工林 / 雨水配分 / 樹幹流 / 樹冠通過雨 / 環境 / 災害
Outline of Research at the Start

近年、豪雨の増加に伴い大規模森林災害が多発し、森林管理は多面的機能の発揮促進から災害に強い森づくりへパラダイムシフトする必要性が検討されるようになってきた。森林では、林内雨は樹冠通過雨および樹幹流という形で林床に到達するが、両要素が森林環境に与える影響は林分構造によって変化する。そこで、針葉樹人工林の林分構造と水循環素過程を総合的に観測し、荒廃針葉樹人工林がどのような形で環境に悪影響を及ぼすのかを明らかにするとともに、得られた観測結果から山地災害や森林環境劣化を軽減する針葉樹人工林の森林管理法を提案する。

Outline of Final Research Achievements

This study investigated the environmental influence of unmanaged coniferous plantations and the way of coping with it mainly in the context of rainfall partitioning (RP) into throughfall (TF), stemflow (SF), and interception loss (IL). The results showed that 1) stand density (SD) was the dominant index of stand structure influencing RP, 2) TF ratio almost linearly decreased with increasing SD, 3) SF and IL ratios increased with increasing SD up to about 2500 trees/ha, but in the range more than that, 4) SF ratio increased at a higher rate, but 5) IL ratio took a downward turn, 6) TF ratio was influenced by the situation of dead branches, and 7) stand SF funneling ratio decreased with increasing diameter at breast height (DBH), which implied that forest management such as thinning should control RP of coniferous plantations.

Academic Significance and Societal Importance of the Research Achievements

近年,豪雨の増加に伴って大規模森林災害が多発し,災害に強い森づくりの重要性が高まっている.森林では,過密になるほど遮断損失が増加し,林内雨(樹冠通過雨と樹幹流の和)が減少するため,豪雨を軽減する効果がある.しかし,樹幹流率が増加して局所的な雨水集中が増加し,樹冠通過雨率は減少するものの,滴下雨成分が増加するため林床により強い雨滴衝撃を与える可能性が高い.本研究は,針葉樹人工林の林分構造と雨水配分の関係を観測し,管理放棄された荒廃人工林とその管理が雨水配分にどのような影響を及ぼすかを明らかにし,枝打ち・間伐等の保育作業によって山地災害軽減の可能性があることを示唆した点で学術的・社会的意義がある.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (15 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (10 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 9 results,  Open Access: 3 results) Presentation (3 results) Book (1 results)

  • [Int'l Joint Research] 中国科学院水利部水土保持研究所/西北農林科技大学(中国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Soil pH and divalent cations after clear-cutting on a Japanese cypress plantation2022

    • Author(s)
      Farahnak Moein、Mitsuyasu Keiji、Ide Jun’ichiro、Chiwa Masaaki、Enoki Tsutomu、Jeong Seonghun、Otsuki Kyoichi、Shimizu Kuniyoshi、Kume Atsushi
    • Journal Title

      Journal of Forest Research

      Volume: - Issue: 5 Pages: 1-8

    • DOI

      10.1080/13416979.2022.2048987

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Negligible Response of Transpiration to Late-Summer Nitrogen Fertilization in Japanese Oak (Quercus crispula)2022

    • Author(s)
      Nagano N、Kume T、Utsumi Y、Tashiro N、Otsuki K、Chiwa M
    • Journal Title

      Nitrogen

      Volume: 3 Issue: 1 Pages: 76-89

    • DOI

      10.3390/nitrogen3010006

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distinct transpiration characteristics of black locust plantations acclimated to semiarid and subhumid sites in the Loess Plateau, China2022

    • Author(s)
      Lyu Jinlin、He Qiu-Yue、Chen Qiu-Wen、Cheng Ran-Ran、Li Guoqing、Otsuki Kyoichi、Yamanaka Norikazu、Du Sheng
    • Journal Title

      Agricultural Water Management

      Volume: 262 Pages: 107402-107402

    • DOI

      10.1016/j.agwat.2021.107402

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Effects of tree mortality on the estimation of stemflow yield in a self‐thinning coniferous plantation2021

    • Author(s)
      Jeong Seonghun、Otsuki Kyoichi
    • Journal Title

      Ecohydrology

      Volume: 14 Issue: 7

    • DOI

      10.1002/eco.2327

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stemflow estimation models for Japanese cedar and cypress plantations using common forest inventory data2020

    • Author(s)
      Jeong Seonghun、Otsuki Kyoichi、Shinohara Yoshinori、Inoue Akio、Ichihashi Ryuji
    • Journal Title

      Agricultural and Forest Meteorology

      Volume: 290 Pages: 107997-107997

    • DOI

      10.1016/j.agrformet.2020.107997

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Sap flow changes and climatic responses over multiple-year treatment of rainfall exclusion in a sub-humid black locust plantation2020

    • Author(s)
      He Qiu-Yue、Yan Mei-Jie、Miyazawa Yoshiyuki、Chen Qiu-Wen、Cheng Ran-Ran、Otsuki Kyoichi、Yamanaka Norikazu、Du Sheng
    • Journal Title

      Forest Ecology and Management

      Volume: 457 Pages: 117730-117730

    • DOI

      10.1016/j.foreco.2019.117730

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effects of thinning on canopy transpiration of a dense Moso bamboo stand in Western Japan2019

    • Author(s)
      Ichihashi Ryuji、Komatsu Hikaru、Kume Tomonori、Shinohara Yoshinori、Tsuruta Kenji、Otsuki Kyoichi
    • Journal Title

      Journal of Forest Research

      Volume: 24 Issue: 5 Pages: 285-291

    • DOI

      10.1080/13416979.2019.1647592

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of thinning on canopy transpiration of a dense Moso bamboo stand in Western Japan,2019

    • Author(s)
      Moein Farahnak, Keiji Mitsuyasu, Kyoichi Otsuki, Kuniyoshi Shimizu, Atsushi Kume
    • Journal Title

      Journal of Forest Research

      Volume: 24(5) Issue: 9 Pages: 730-730

    • DOI

      10.3390/f10090730

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration2019

    • Author(s)
      Kenji Tsuruta, Hikaru Komatsu, Tomonori Kume, Kyoichi Otsuki, Yoshiko Kosugi, Ken'ichiro Kosugi
    • Journal Title

      Ecohydrolog

      Volume: 12(5) Issue: 5 Pages: 1-15

    • DOI

      10.1002/eco.2097

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Relationship between stand structures and rainfall partitioning in dense unmanaged Japanese cypress plantations2019

    • Author(s)
      Seonghun Jeong, Kyoichi Otsuki, Moein Farahnak
    • Journal Title

      Journal of Agricultural Meteorology

      Volume: 75 Issue: 2 Pages: 92-102

    • DOI

      10.2480/agrmet.D-18-00030

    • NAID

      130007630086

    • ISSN
      0021-8588, 1881-0136
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ヒノキ人工林における間伐が樹冠通過雨の雨滴衝撃エネルギーに与える影響2022

    • Author(s)
      李昱竺・上谷梨咲・鄭聖勲・智和正明・大槻恭一
    • Organizer
      第133回日本森林学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 老齢高密度非管理ヒノキ人工林における雨水配分2022

    • Author(s)
      上谷梨咲・李昱竺・鄭聖勲・大槻恭一
    • Organizer
      第133回日本森林学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 過密非管理ヒノ構造キ人工林における林分と雨水配分に関する研究2019

    • Author(s)
      鄭 聖勳, 大槻 恭一, Farahnak Moein
    • Organizer
      水文・水資源学会2019年度研究発表会
    • Related Report
      2019 Annual Research Report
  • [Book] 水資源対策としての森林管理2021

    • Author(s)
      大槻 恭一(編集:恩田 裕一、五味 高志)
    • Total Pages
      260
    • Publisher
      東京大学出版会
    • ISBN
      9784130711074
    • Related Report
      2021 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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