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Weed communities and its dynamics in forest plantations of Sugi(Cryptomeria japonica) at various densities

Research Project

Project/Area Number 03660148
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionUniversity of Tokyo

Principal Investigator

SAKURA Tsuguo  University of Tokyo, Faculty of Agriculture, Lecturer, 農学部(林), 講師 (70012078)

Co-Investigator(Kenkyū-buntansha) TANGE Takeshi  University of Tokyo, Faculty of Agriculture, Assistant, 農学部, 助手 (20179922)
SUZUKI Makoto  University of Tokyo, Faculty of Agriculture, Assistant, 農学部(林), 助手 (40012091)
山根 明臣  東京大学, 農学部(林), 教授 (30182588)
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥900,000 (Direct Cost: ¥900,000)
KeywordsSugi plantations / Weed community / Community dynamics / Planting density / Growth of planted trees / Stand structure / Annual change / The southern part of Boso peninsula / 立地環境 / 雑草木群落の動態 / 立木密度 / 植物遷移 / 植生パターン / 状態診断 / 雑草木害 / 造林 / 植生パタ-ン / 育林
Research Abstract

The study was conducted in the forest of Tokyo university in the southern part of the Boso peninsula, to study the weed vegetation and its dynamics in forest plantations of Sugi(Cryptomeria japonica D.DON) at various densities.
Species compositions, structure, etc.of weed vegetation changing with years were investigated mainly in a young plantation of Sugi at various densities.
At the same time, growth status of planted trees, and forest structure were examined.
In a young Sugi-stand with 3 treatment plots(tree density plots of 2,500, 3,906, 6,944 trees per hectare respectively), tall-grass type's Susuki(Miscanthus sinensis ANDERSS) belong to Gramineae has become the most dominant species on 2nd-yr to 5th-yr old stands after planting in each plot.
In both plots of the lowest and the middle densities, the coverage percentages of Susuki plants were judged from an annual changes, decreased markedly on and after 5th-yr-old in both plot stands become into 3m, 45% in the mean height and the mean coverage of Sugi planting trees.
On the other hand, Susuki plants in the highest density plot decreased markedly in the stands on and after 3rd-yr-old stand become into 2m, 30% in the mean height and the mean coverage of Sugi planting trees.
Consequently, in this survey area, when densities of Sugi planting trees were 6,944 trees or over trees per hectare, here showed that Susuki plants have a trend of decreasing markedly in earlier, younger year old stand(on and after 3rd-yr-old stand) after Sugi planting.
From results in these vegetation survey, here could to catching an outline of the actual conditions for dynamics of weed vegetation in relations with tree densities in Sugi forest plantations in the southern part of Boso.

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 佐倉詔夫: "スギ疎密植栽地に侵入し繁茂したススキの動態-植栽後8年間の経過-" 104回日林論. 575-578 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 鈴木誠: "スギ56年生疎密植栽林分の成長状態" 45回日林関東支論. (印刷中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Tsuguo SAKURA: "Thickness conditions of Miscanthus sinensis in young stands of Cryptomeria japonica D.DON at various densities-Process during eight years after planting" Trans.104th Meet.Jpn.For.Soc.575-578 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Makoto SUZUKI: "Growth of planting trees in the 56-year old Sugi(Cryptomeria japonica D.DON) stands with various tree densities" Trans.45th Meet.Kanto Br., Jpn.For.Soc., -Be In The Press. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 佐倉詔夫: "スギ疎密植栽地に侵入し繁茂したススキの動態-植栽後8年間の経過-" 104回日林論. 575-578 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 鈴木誠: "スギ56年生疎密植栽林分の成長状態" 45回日林関東支論. (印刷中). (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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