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Clarification of tree strategies for absorbing soil insoluble P through field survey and cultivation experiment

Research Project

Project/Area Number 21K20594
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0603:Forestry and forest products science, applied aquatic science, and related fields
Research InstitutionUniversity of Yamanashi

Principal Investigator

MUKAI Mana  山梨大学, 大学院総合研究部, 助教 (60909159)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords土壌 / リン / 細根 / 滲出物 / 有機酸 / ホスファターゼ / 森林 / 根圏 / 難溶性リン / リン循環 / 細根滲出物 / 元素マッピング
Outline of Research at the Start

本研究の目的は、野外観察と栽培実験を通じて樹木の難溶性リンの獲得様式を探ることである。リンは生物にとって必須元素であり、森林生態系内ではリンは閉鎖的に循環する。リンは時間経過に伴い形態が変化し、植物が利用可能なリンと、利用しにくい難溶性リンおよび、利用不可能な吸蔵態リンの大きく3つに分けられる。中でも中間の形態をとる難溶性リンが土壌内でも多く存在し、森林生態系のリン循環に貢献すると考えられるが、それらの獲得様式は未解明な部分が多い。本研究では、土壌中の難溶性リンの中でも、特に有機態リンと非吸蔵態リンに着目し、それらの森林生態系における樹木の獲得様式を明らかにする。

Outline of Final Research Achievements

There are several forms of phosphorus (P) in forest soils. Plant available P are soluble in soils and easy to get for trees, while insoluble P are existing as organic forms and/or as non-occluded P which are bound to non-crystalline minerals. However, it is not clarified how trees get these insoluble P from their roots.
The purpose of this study was to clarify tree strategies for capturing soil insoluble P through field survey and cultivation experiment. I studied the relationship between root traits such as phosphatase activities and the flux rates of exudates and rhizosphere soil P fractions. This study showed that trees would change the flux rates of root exudates and root phosphatase activities along soil P fraction concentrations (non-occluded P and organic P).

Academic Significance and Societal Importance of the Research Achievements

野外では複数の環境要因が複数相互に影響し合っているため、野外で樹木のリン獲得の様子を知ることは非常に難しいが、本研究の多地点での比較研究を通して森林生態系のリン循環の様子が明らかになってきた。また、栽培実験も組み合わせることで、樹木の環境変動に応じた順応という点からの知見が得られたと考えられる。本研究成果は森林生態系でのリン循環や、将来的に火山活動などの地球環境改変イベントなどによりリン環境が変化した際の生物地球化学的な影響に関する将来的な予測のための知見を得られたという点で大きな波及効果があると期待できる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (10 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (5 results)

  • [Journal Article] Nutrient-addition effects of volcanic-ash deposition in forest ecosystems:2022

    • Author(s)
      高木真由, 向井真那, 吉田智弘, 佐々木真優, 水上知佳, 北山兼弘
    • Journal Title

      Japanese Journal of Forest Environment

      Volume: 64 Issue: 2 Pages: 65-76

    • DOI

      10.18922/jjfe.64.2_65

    • ISSN
      0388-8673, 2189-6275
    • Year and Date
      2022-12-25
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dysbiosis of the rhizosphere microbiome caused by γ-irradiation alters the composition of root exudates and reduces phosphorus uptake by rice in flooded soils2022

    • Author(s)
      Mukai Mana、Hiruma Kei、Nishigaki Tomohiro、Utami Yuniar Devi、Otaka Junnosuke、Yoshihashi Tadashi、Sarr Papa Saliou、Oo Aung Zaw、Takai Toshiyuki、Tujimoto Yasuhiro
    • Journal Title

      Plant and Soil

      Volume: . Issue: 1-2 Pages: 1-17

    • DOI

      10.1007/s11104-022-05726-5

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Demography and selection analysis of the incipient adaptive radiation of a Hawaiian woody species2022

    • Author(s)
      Ayako Izuno ,Yusuke Onoda,Gaku Amada,Keito Kobayashi,Mana Mukai,Yuji Isagi,Kentaro K. Shimizu
    • Journal Title

      PLOS Genetics

      Volume: 18 Issue: 1 Pages: e1009987-e1009987

    • DOI

      10.1371/journal.pgen.1009987

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effects of tree-root exudates on the solubilization of phosphorus adsorbed to non-crystalline minerals in the rhizosphere volcanic soils on Yakushima Island, Japan2021

    • Author(s)
      Mukai M, Aiba S, Kitayama K
    • Journal Title

      Trees

      Volume: 35 Issue: 6 Pages: 2031-2041

    • DOI

      10.1007/s00468-021-02170-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Synergy between a shallow root system with a DRO1 homologue and localized P application improves P uptake of lowland rice2021

    • Author(s)
      Aung Zaw Oo , Yasuhiro Tsujimoto , Mana Mukai , Tomohiro Nishigaki , Toshiyuki Takai , Yusaku Uga
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 9484-9484

    • DOI

      10.1038/s41598-021-89129-z

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 幅広い土壌リン濃度に生育するコナラの細根滲出物の種内変異と根圏土壌への影響2023

    • Author(s)
      向井真那, 水上知佳, 北原廉也, 北山兼弘
    • Organizer
      第70回日本生態学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 土壌リン濃度の異なるコナラ林における土壌リンの空間分布と細根分布の関係2023

    • Author(s)
      北原廉也, 向井真那
    • Organizer
      第70回日本生態学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 土壌深度による土壌リン形態変化が樹木細根の滲出物と酵素活性に及ぼす影響2023

    • Author(s)
      西山敦貴, 向井真那
    • Organizer
      第70回日本生態学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fine-root phosphatase activities in Quercus serrata and its determinants on a wide gradient of soil-phosphorus availability2023

    • Author(s)
      Chika MIZUKAMI, Mana MUKAI, Rota WAGAI, Tatsuhiro EZAWA, Kanehiro KITAYAMA
    • Organizer
      ESJ70
    • Related Report
      2022 Annual Research Report
  • [Presentation] 土壌リン可給性の異なるコナラ林での細根滲出物の種内変異と根圏土壌に及ぼす影響2021

    • Author(s)
      向井真那, 水上知佳, 澤田佳美, 北山兼弘
    • Organizer
      第69回日本生態学会
    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2024-01-30  

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