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Elucidation of the process of change in nutrient use by trees due to excess nitrogen

Research Project

Project/Area Number 17K07866
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Forest science
Research InstitutionForest Research and Management Organization

Principal Investigator

Nagakura Junko  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 (70353787)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords施肥 / 養分バランス / 土壌酸性化 / 窒素源 / 水ストレス / 葉分析 / 窒素付加 / 連年施肥 / 交換性アルミニウム / 交換性塩基 / 葉の養分含有量 / 林学
Outline of Final Research Achievements

The effect of excess nitrogen (N) on the nutrient status of trees and soil and the annual change in this status was studied in stands of Monarch birch and Todo fir that have been fertilized continuously for more than 40 years. In the fertilized (F) plots, leaf concentrations of N, P, and K increased in the 2nd year of fertilization; however, such increases were less obvious after the 5th year of fertilization. Leaf Mg concentration in the F plots exhibited a decreasing trend from the 5th year, whereas leaf Al and Mn concentrations increased from the 2nd year. In the F plots, the exchangeable content of Ca and Mg in the surface soil was lower and the exchangeable Al content higher than was the case in the non-F plot. Though excess N changed the nutrient status of both the trees and the soil, it did not reduce tree growth. Analysis of leaf N stable isotope ratios indicated that birch and fir differed in their nitrogen utilization, with fir being more dependent on fertilizer.

Academic Significance and Societal Importance of the Research Achievements

人間活動により森林に付加される窒素量が増加し続けた場合、ウダイカンバやトドマツにおいて初期には葉の窒素濃度が高まり乾物生産が促進されるが、長期化すると土壌が酸性化し、樹木の生育に悪影響を及ぼす可能性があることを明らかにした。外部から付加される窒素の利用しやすさが樹種によって異なることや、懸念されていた水ストレスの助長はほとんど見られないという知見が炭素安定同位体比の利用により得られたことの学術的な意義は大きい。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2021 2019 2018

All Journal Article (3 results) (of which Peer Reviewed: 2 results) Presentation (3 results)

  • [Journal Article] 連年施肥40年目のウダイカンバ林とトドマツ林の土壌養分状態2021

    • Author(s)
      長倉淳子、古澤仁美、伊藤江利子、橋本徹、梅村光俊
    • Journal Title

      関東森林研究

      Volume: 72

    • Related Report
      2020 Annual Research Report
  • [Journal Article] 施肥開始から18年間のトドマツ針葉とウダイカンバ落葉の養分濃度変化2019

    • Author(s)
      長倉 淳子,古澤 仁美,相澤 州平,伊藤 江利子,橋本 徹
    • Journal Title

      関東森林研究

      Volume: 70 Pages: 73-76

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of repeated fertilization and liming on soil microbial biomass in Betula maximowicziana Regel and Abies sachalinensis Fr. Schmidt stands in Japan2018

    • Author(s)
      FURUSAWA Hitomi, NAGAKURA Junko, AIZAWA Shuhei, ITO Eriko
    • Journal Title

      Landscape and Ecological Engineering

      Volume: 15 Issue: 1 Pages: 101-111

    • DOI

      10.1007/s11355-018-0366-x

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 連年施肥がウダイカンバとトドマツの葉の窒素安定同位体比におよぼす影響2021

    • Author(s)
      長倉淳子、古澤仁美、伊藤江利子、橋本徹、中下留美子
    • Organizer
      日本森林学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 施肥開始から18年間のトドマツ針葉とウダイカンバ落葉の養分濃度変化2018

    • Author(s)
      長倉淳子、古澤仁美、相澤州平、伊藤江利子、橋本徹
    • Organizer
      関東森林学会
    • Related Report
      2018 Research-status Report
  • [Presentation] ウダイカンバ連年施肥林の落葉の養分濃度 -施肥開始から17年間の変化-2018

    • Author(s)
      長倉淳子、古澤仁美、伊藤江利子、橋本徹、相澤州平
    • Organizer
      第129回日本森林学会大会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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