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Belowground carbon dynamics in permafrost forests with different active layer depths

Research Project

Project/Area Number 16H05790
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Forest science
Research InstitutionForest Research and Management Organization

Principal Investigator

Noguchi Kyotaro  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 (70353802)

Co-Investigator(Kenkyū-buntansha) 森下 智陽  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 (90391185)
Project Period (FY) 2016-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2016: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords細根成長 / クロトウヒ / 下層植生 / 斜面位置 / 活動層 / 林床蘚類 / 細根成長量 / 細根形質 / フェザーモス / ミズゴケ / 炭素動態 / 森林 / 生態学 / 土壌学 / 環境 / 地上部現存量 / 細根現存量 / 凍土融解深 / リターフォール / 細根生産量 / 温度 / 含水率 / 土壌呼吸速度 / 林床植生 / イングロースコア
Outline of Final Research Achievements

In permafrost black spruce stands on a north facing slope in Interior Alaska, litterfall production rates and fine root growth rates were examined. Our results showed that litterfall production rates were greater at upper slope, where active layer depth was greater than at lower slope. On the other hand, fine root growth rates were similar among the plots across the slope positions, suggesting that allocation to fine roots was greater at lower slope than at upper slope. Fine root growth rates of black spruce trees were greater at upper slope than at lower slope, whereas those of understory plants were greater at lower slope in contrast. These results indicated that contribution of understory plants to fine root growth was greater than that of black spruce trees at lower slope, where active layer depths were shallower. Taken together, this study suggest that understory plants play a key role in belowground carbon dynamics at environments with shallower active layer depths.

Academic Significance and Societal Importance of the Research Achievements

永久凍土林は凍結した土壌に莫大な量の炭素を蓄積しており、地球の炭素動態を理解する上で極めて重要な生態系だが、永久凍土林の炭素動態については不明な点が多い。本研究では、夏季に融解する凍土の深さが小さいほど、地下部への同化産物分配が大きくなることを明らかにした。また、凍土の融解が小さい林分ではツツジ科低木などの下層植生の細根成長量が大きく、地下部への炭素供給において重要な役割を担うと考えられた。これらの結果は、今後、緯度や地形により異なる、あるいは温暖化などの影響により変化する永久凍土上の森林の炭素動態を評価する上で、重要な知見と言える。

Report

(6 results)
  • 2022 Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (11 results)

All 2021 2020 2018 2017 Other

All Int'l Joint Research (5 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

  • [Int'l Joint Research] アラスカ大学国際北極圏研究センター(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] アラスカ大学フェアバンクス校国際北極圏研究センター(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] アラスカ大学(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] アラスカ大学(米国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] アラスカ大学(米国)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Fine Root Growth of Black Spruce Trees and Understory Plants in a Permafrost Forest Along a North-Facing Slope in Interior Alaska2021

    • Author(s)
      Kyotaro Noguchi, Yojiro Matsuura, Tomoaki Morishita, Jumpei Toriyama, Yongwon Kim
    • Journal Title

      Frontiers in Plant Science

      Volume: 12 Pages: 769710-769710

    • DOI

      10.3389/fpls.2021.769710

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] アラスカ内陸部の永久凍土クロトウヒ林におけるクロトウヒと下層植生の細根成長2021

    • Author(s)
      野口享太郎、松浦陽次郎、森下智陽、鳥山淳平、Kim Yongwon
    • Organizer
      第54回根研究集会
    • Related Report
      2020 Annual Research Report
  • [Presentation] アラスカ内陸部の斜面位置の異なるクロトウヒ林における細根動態2020

    • Author(s)
      野口享太郎、松浦陽次郎、森下智陽、鳥山淳平、Kim Yongwon
    • Organizer
      第131回日本森林学会大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] アラスカ内陸部の永久凍土林におけるクロトウヒ および下層植生の細根生産量2018

    • Author(s)
      野口享太郎、松浦陽次郎、森下智陽、鳥山淳平、Yongwon Kim
    • Organizer
      第129回日本森林学会大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Fine root production rates in a black spruce stand in interior Alaska underlain with permafrost2017

    • Author(s)
      Kyotaro Noguchi, Yojiro Matsuura, Tomoaki Morishita, Yongwon Kim, Junpei Toriyama
    • Organizer
      7th International Symposium on Physiological Processes in Roots of Woody Plants
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 凍土融解深の異なる永久凍土林における地下部炭素動態の定量評価と制御要因の解明

    • URL

      https://www.ffpri.affrc.go.jp/ipo/jointresearch/tansodotai/index.html

    • Related Report
      2020 Annual Research Report

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Published: 2016-04-21   Modified: 2024-01-30  

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