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Investigation of nitrate utilization in a boreal forest ecosystem using nitrogen isotope analysis

Research Project

Project/Area Number 20K06142
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40010:Forest science-related
Research InstitutionShinshu University

Principal Investigator

Oda Ayumi  信州大学, 学術研究院農学系, 助手 (40571609)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords窒素同位体比 / 北方林 / 硝酸態窒素 / 窒素利用 / 樹種特性 / 窒素吸収
Outline of Research at the Start

硝酸態窒素は熱帯や温帯の森林では植物の重要な窒素源の一つだが、低温環境下では生成されにくく、北方林生態系の窒素源として考慮されていなかった。しかし近年、同位体比分析技術の発展により、低温環境下に生育する植物の葉の液胞に土壌由来の硝酸態窒素が存在し利用されていることが確認され、土壌中には見えない硝酸態窒素も植物の窒素源となっている可能性が出てきた。そこで本課題では、現存量の大きい樹木種の葉内に硝酸態窒素が存在するかどうかスクリーニング調査をおこない、同位体分析により北方林生態系における樹木の硝酸態窒素利用実態の解明を試みる。

Outline of Final Research Achievements

In this study, we investigated the role of nitrate as a nitrogen source for trees and the plasticity of their ability to uptake nitrogen, which has not been considered as a nitrogen source for forest trees in boreal forests or in low-temperature environments at high elevations. As a result, the absorptive capacity of nitrate-nitrogen differed among tree species, and even among tree species using nitrate-nitrogen absorption, the amount of nitrate-nitrogen absorbed varied depending on the growth environment, such as elevation. Nitrate requires more energy for assimilation than other forms of nitrogen. This study showed that forest trees in low temperature and oligotrophic environments adjust their ability to use and absorb nitrate according to their growth environment.

Academic Significance and Societal Importance of the Research Achievements

本研究により、これまで土壌中の存在量が少なく、通常の分析では検出が難しかった硝酸態窒素の樹種ごとの利用実態を明らかにし、北方林樹木の生産性に関わる土壌からの窒素吸収モデルを精緻化できる可能性がある。

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

    (7 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] モンゴル国立大学(モンゴル)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Different relationships of fine root traits with root ammonium and nitrate uptake rates in conifer forests2023

    • Author(s)
      Ito, T., Tanaka-Oda, A., Masumoto, T., Akatsuki, M., & Makita, N.
    • Journal Title

      Journal of Forest Research

      Volume: 28 Issue: 1 Pages: 25-32

    • DOI

      10.1080/13416979.2022.2102752

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] 山岳域における樹木細根の窒素吸収機能の全容:標高による変化の解明2022

    • Author(s)
      藤拓生・小田あゆみ・増本泰河・橋本裕生・宮本裕美子・牧田直樹
    • Organizer
      第134回日本森林学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 山岳域の標高に沿った土壌中の無機態窒素濃度と植物根による吸収量の変化2021

    • Author(s)
      小田あゆみ ・ 伊藤拓生 ・ 武居玄 ・ 牧田直樹 ・ 小林元
    • Organizer
      第133回日本森林学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] The relationship of inorganic nitrogen uptake with fine root traits of four conifers in cool temperate forest2021

    • Author(s)
      Takumi Ito, Ayumi Oda, Maiko Akatsuki, Taiga Masumoto, Naoki Makita
    • Organizer
      International Society of Root Research 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 山岳域の樹木細根による無機態窒素吸収は標高差によって変化するのか?2021

    • Author(s)
      伊藤拓生・小田あゆみ・増本泰河・橋本裕生・牧田直樹
    • Organizer
      第133回日本森林学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] モンゴル森林ステップの森林と草原に生育する木本種の炭素および窒素同位体比2020

    • Author(s)
      小田あゆみ・安江恒・城田徹央・Gerelbaatar Sukhbaatar・Soronzonbold Bayarbaatar・Baatarbileg Nachin・山中典和
    • Organizer
      日本森林学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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