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The behavior of leaves, branches and stem in a tree crown under mechanical forces such as snow and wind loads

Research Project

Project/Area Number 04660163
Research Category

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

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionNagoya University

Principal Investigator

MORIOKA Noboru  Nagoya Univ.Fac.of Agri.Prof., 農学部, 教授 (40007943)

Co-Investigator(Kenkyū-buntansha) KONDO Minoru  Nagoya Univ.Fac.of Agri.Assist.Prof., 農学部, 助手 (80153732)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsLive branch / Seasonal change / Flexibility of branch / Snow break / Selective cutting / Tree hang-up / Energy absorbtion / Photographic analysis / 生枝強度 / 非破壊的測定法 / 弾性係数 / 樹冠 / 接触摩擦力 / 非破壊的測定 / 冠雪量 / 風雪害 / 強度の季節変化
Research Abstract

A non-destructive field method was introduced in this research for estimating the Modulus of Elasticity (E) of live branches which is strongly rerated to the tree crown behavior under external loads. This method was very useful in the investigation of the time-dependent factors, such as effect of changes in atmospheric conditions due to the seasons and effect of branch ageing on the flexibility of branches.
The E values of measured three coniferous species all decreased in warm seasons and increased in cold seasons, especially became largest under freezing temeratures in winter. Live branches of Cryptomeria japonica would not fail under loads which they may normally experience in their life time. However, our investigation revealed that the possibility of their branch and stem breakage by snow loads increases when they become stiffend in cold winter. It was also revealed that E values of branches varied with age and species. Variation in the mean annual growth ring width and the specific gravity accounted for changes in the E values of individual branches.
The capacity of live branches to absorb mechanical energy was theoretically and practically investigated. It may contribute to planning and improvement of various tree harvesting operations. Further, the photographic methods were examined for measuring and analyzing the crown shape of standing tree and also branch distribution in the crown.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Onwana-Agyeman,S,Morioka,N,Kitagawa,K.and Kondo,M.: "Estimating the Bending Strength of Branches in a Plantation." Proc.Soc.American Foresters 1992 National Convention,Richmoud,VA,USA. 517-518 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman,S,Morioka,N,Kitagawa,K.and Kondo,M.: "A quicker and non-destructive field method for estimating the strength of living branches in a plantation forest." J.Jpn.For.Soc.76. 321-328 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman,S,Morioka,N,Kondo,M.and Kitagawa,K.: "A theoretical model for estimating the energy-storing potential of coniferous branches." Proceedings of the meeting on advanced technology in forest operations:Applied ecology in action,Portland,OR,USA. 336-343 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 森岡 昇、近藤 稔、オンウォナ アジマン シアウ、今井規子: "かかり木における樹冠の接触抵抗力" 日本林学会大会論文集. 105. 631-632 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 近藤 稔、森岡 昇、オンウォナ アジマン シアウ: "35mmステレオ写真画像によるスギ樹冠部枝張りの解析" 日本林学会大会論文集. 105. 621-622 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 森岡 昇・オンウォナ アジマン シアウ・近藤 稔: "林木生枝の冬季硬化と雪折れの可能性-スギ造林木の場合" 日本林学会中部支部大会論文集. 43. 139-142 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 近藤 稔・オンウォナ アジマン シアウ・松本 武・森岡 昇: "スギ、カラマツの立木樹冠部枝張りの写真解析" 日本林学会中部支部大会論文集. 43. 171-174 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman,S,Morioka,N,Kondo,M.and Kitagawa,K.: "Seasonal changes in the Modulus of Elasticity of living branches of three coniferous species." Ecological Research. (in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman, S., Morioka, N., Kitagawa, K.and Kondo, M.: "Estimating the Bending Strength of Branches in a Plantation." Proc.Soc.American Foresters 1992 National Convention, Richmond, VA,USA. 517-518 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman, S., Morioka, N., Kitagawa, K.and Kondo, M.: "A quicker and non-destructive field method for estimating the strength of living branches in a plantation forest." J.Jpn.For.Soc.76. 321-328 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman, S., Morioka, N., Kondo, M.and Kitagawa, K.: "A theoretical model for estimating the energy-storing potential of coniferous branches." Proceedings of the meeting on advanced technology in forest operations : Applied ecology in action, Portland, OR,USA. 336-343 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Morioka, N., Kondo, M., Onwona-Agyeman, S.and Imai, N.: "Resisting forces encountered by a tree falling between the crowns of standing trees. (in Japanese)" Transactions of the Japanese Forestry Society.105. 631-632 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kondo, M., Morioka, N.and Onwona-Agyeman, S.: "Analysis of the orientation of branch axs in a sugi (Cryptomeria japonica) tree crown using 35 mm photographic images. (in Japanese)" Transactions of the Japanese Forestry Society.105. 621-622 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Morioka, N., Onwona-Agyeman, S.and Kondo, M.: "The stiffening of SUGI branches in cold winter and its influence on the possibility of snow break. (in Japanese)" Transactions of the 43rd Annual Meeting of the Chubu Branch of the Japanese Forestry Society.139-142 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kondo, M., Onwona-Agyeman, S., Matsumoto, T.and Morioka, N.: "Photographic analysis of the orientation of branch axs in sugi and karamatsu tree crowns. (in Japanese)" Transactions of the 43rd Annual Meeting of the Chubu Branch of the Japanese Forestry Society.171-174 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman, S., Morioka, N., Kondo, M.and Kitagawa, K.: "Seasonal changes in the Modulus of Elasticity of living branches of three coniferous species." Ecological Research. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Onwona-Agyeman,S.,Morioka,N.,Kitagawa,K.and Kondo,M.: "Estimating the Bending Strength of Branches in a Plantation." Proc.Soc.American Foresters 1992 National Convention,Richmond,VA,USA. 517-518 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] Onwona-Agyeman,S.,Morioka,N.,Kitagawa,K.and Kondo,M.: "A quicker and non-destructive field method for estimating the strength of living branches in a plantation forest." J.Jpn.For.Soc.76. 321-328 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Onwona-Agyeman,S.,Morioka,N.,Kondo,M.and Kitagawa,K.: "A theoretical model for estimating the energy-storing potential of coniferous branches." Proceedings of the meeting on advanced technology in forest operations:Applied ecology in action,Portland,OR,USA. 336-343 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 森岡 昇、近藤 稔、オンウォナ アジマン シアウ、今井規子: "かかり木における樹冠の接触抵抗力" 日本林学会大会論文集. 105. 631-632 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 近藤 稔、森岡 昇、オンウォナ アジマン シアウ: "35mmステレオ写真画像によるスギ樹冠部枝張りの解析" 日本林学会大会論文集. 105. 621-622 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 森岡 昇,オンウォナ アジマン シアウ,近藤 稔: "林木生枝の冬季硬化と雪折れの可能性-スギ造林木の場合" 日本林学会中部支部大会論文集. 43. 139-142 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 近藤 稔,オンウォナ アジマン シアウ,松本 武,森岡 昇: "スギ、カラマツの立木樹冠部枝張りの写真解析" 日本林学会中部支部大会論文集. 43. 171-174 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Onwana-Agyeman,S.,Morioka,N.,Kondo,M.and Kitagawa,K.: "Seasonal changes in the Modulus of Elasticity of living branches of three coniferous species.(in press)" Ecological Research. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Onwona-Agyeman,S.,Morioka,N.,Kitagawa,K.and Kondo,M.: "Estimating the Bending Strength of Branches in a Plantation." Proc.Soc.Americ.Foresters 1992 Nat'l Conv.,Richmond,VA,USA. 517-518 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] Onwona-Agyeman,Siaw: "Estimating the bending stress of branches in a plantation forest" Proc. SAF National Congress 1992.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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