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Effects of carbon and nitrogen interactions on terrestrial ecosystems

Research Project

Project/Area Number 09640745
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 生態
Research InstitutionUniversity of Tokyo (1998-2001)
Gunma University (1997)

Principal Investigator

TATENO Masaki  University of Tokyo, Graduate school of Science, Associate Professor, 大学院・理学系研究科, 助教授 (00179730)

Project Period (FY) 1997 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1999: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1998: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsCarbon / Nitrogen / Vegetative growth model / Ecosystem model / Competition / Succession / N_2-fixing / Higher plants / 窒素利用 / 落葉樹 / ヤマグワ / 最大光合成速度 / 物質分配 / 窒素環境適応 / 通導性 / イタドリ / シロザ / ヤシャブシ / 窒素競争 / 窒素利用効率 / 落葉樹林 / 繁殖戦略 / ブナ / モミ / 陸上生態系 / 窒素循環
Research Abstract

We developed a growth model of plants and a ecosystem model with special reference to carbon and nitrogen interactions. Then we tried to test the predictions of the models.
1. Optimal matter partitioning of plants depends on soul fertility, plant shape, and life history. Leaf nitrogen contents (i.e. photosynthetic capacity) predicted by the model are similar to those measured in the fields.
2. Nitrogen-fixing alder does not resorb nitrogen form senescing leaves in autumn. As a result, the alder has growth period extension in autumn. The amount of energy assimilated by the alder in the extended growth period was about six times that required for compensating the nitrogen loss. This surplus energy balance provides an advantage over the non-nitrogen-resorbing trait of nitrogen-fixing deciduous trees.
3. Our nitrogen competition model predicted that natural vegetation in the cool temperate zone must be mixed forest of deciduous trees and evergreen conifers. However, deciduous forests without the conifers are widely distributed in the zone. We measured the elongation growth of understory conifers in the deciduous forests. We showed that the saplings of conifers attain the forest canopy of the deciduous forests within 100 years from their germination. This support the model prediction. Probably, the deciduous forests in the cool temperate zone are secondary forests caused by continual fellings. About 40 year ago, Japanese people changed their energy source from trees to petroleum. Accordingly, the secondary deciduous forests are returning to natural mixed forest.

Report

(5 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 舘野正樹: "窒素をめぐって植物はたたかう"科学. 70. 207-215 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 舘野正樹: "植物の生理生態学"文一総合出版(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaki Tateno: "Nitrogen competition and emergent properties of ecosystems"Kagaku. 70 (in Japanese). 207-215

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaki Tateno: "Ecophysiology of plants"Bunnich Sogo Shuppan (in press) (in Japanese).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 舘野正樹: "窒素をめぐって植物はたたから"科学. 70. 207-215 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 舘野正樹: "窒素をめぐって植物はたたかう-植物の窒素利用様式がもたらす生態現象"科学. 70. 207-215 (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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