• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Carbon and nitrogen relationship in soil N Transformation of a forest ecosystem

Research Project

Project/Area Number 08660188
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TOKUCHI Naoko  Kyoto University, Graduate School of Agriculture Instructer, 農学研究科, 助手 (60237071)

Co-Investigator(Kenkyū-buntansha) NAKANISHI Asami  Kyoto University University Forest Instructer, 農学部・附属演習林, 助手 (60273497)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordsforest ecosystem / forest soil / N cycling / N transformation / nilrification / energy source / 窒素無機化能 / 可水溶性有機物 / 腐植 / 窒素無機化過程 / 無機態窒素 / 可水溶性炭素 / 微生物
Research Abstract

The objectives of this study are to describe the relationship between the form of inorganic N and C and to evaluate the importance of C as energy source for N cycling. We studied the transect along a slope under the same aged Cryptomeria plantation in Mt. Ryuoh, Shiga prefecture.
1. Topographical variation of soil N transformation ; Although there was no significant difference in N mineralization rate, nitrification rate was different between the positions of the slope. Nitrification ratio to mineralization was almost 100% at the lower slope, while no nitrification occurred at the upper part of the slope. At the middle part of the slope, patchy distribution of high nitrification and low nitrification was shown.
2. Controlling factor of net soil N transformation ; Soil moisture content, total C and N, water extractable organic C and N (ex. C and N) and pH were investigated along the transect. The principle analysis showed nitrification was the function of ex. C, ex. N and moisture content, while mineralization was the function of total C and N.it indicated that nitrification was controlled by available substrate, mineralization was regulated by total substrate.
3. Controlling factor of gross soil N transformation ; Gross soil N transformation was investigated by using 15N dilution method. The high gross N mineralization and nitrification were shown at the lower part of the slope, It was consistent with the low soil C/N.At the upper part of the slope, low mineralization, low nitrification and high soil C/N was shown, It suggests that C is limiting under low C/N at the lower part of the slope and autotrophic nitrification dominated.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 徳地直子: "竜王山森林試験地の斜面上の異なる位置における窒素循環機構" 京都大学農学部演習林報告. 68. 9-25 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 中西麻美: "森林表層土壌における無機能窒素の動態とカチオン濃度の対応" 京都大学農学部演習林報告. 69. 14-25 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tokuchi, N.: "Gross N transformation in a coniferous forest in Japan" Environmental Forest Science. 54. 239-244 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hiroba, M.: "Spatial variability of soil N transformation patterns" European Journal of Soil Science. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tokuchi, N.: "N cycling mechanisms at the different positions of a slope in Mt.Ryuoh." Bull.Kyoto Univ.Forests. 68,17. 9-25 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Nakanishi, A.: "Dynamics of inorganic nitrogen and accompanying cation in a surface layer of forest soils." Bull.Kyoto Univ.Forests. 69,11. 14-25 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Tokuchi, N.: "Gross N transformation in a coniferous forest in Japan" Environmental Forest Science. 54,5. 239-244 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hirobe, M.: "Spatial variability of soil N transformation pattern." Journal of European Soil Science. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 中西麻美: "森林表層土壌における無機態窒素の動態とカチオン濃度の対応" 京都大学農学部演習林報告. 69. 14-25 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Tokuchi,N.: "Gross N Transformation in a coniferous forest in Japan" Environmental Forest Science. 54. 239-244 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hirobe,M.: "Spatial variability of soil N transformation Patterns" European Journal of Soil Science. in press.

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi