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2010 Fiscal Year Final Research Report

Mechanical properties affecting the within-tree variation of microfibril angle

Research Project

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Project/Area Number 20780132
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Wood science
Research InstitutionForestry and Forest Products Research Institute

Principal Investigator

YAMASHITA Kana  Forestry and Forest Products Research Institute, 木材特性研究領域, 主任研究員 (60353900)

Project Period (FY) 2008 – 2010
Keywords材質 / 物性 / ミクロフィブリル傾角 / 力学的性質 / 樹幹内変動 / 根材
Research Abstract

Microfibri angle (MFA) is large in the juvenile wood within stem, and is different by species and clones within the same species. It suggests that MFA is genetic component, but also it is affected by a factor changing by tree growth such as tree mechanical properties. Tree structure including the root system was examined, and the wood properties were compared between the stem and branch wood formed under gravitation and the root wood formed under gravity-free state, using sugi (Cryptomeria japonica) clones having different MFA and spruce having small MFA. The root systems were different by clones or species having different MFA and strength properties in the stem. The MFA difference between young sugi clones were large in the stem wood, but small in the root wood, which suggested that the large MFA variation in the sugi juvenile wood is observed only above the ground. The root wood was eccentric, didn't form the compression wood and its growth stress distribution was not symmetric about the center.

  • Research Products

    (6 results)

All 2011 2010 2009

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (4 results)

  • [Journal Article] Wood properties of Picea koyamae : within-tree variation of grain angle, tracheid length, microfibril angle2010

    • Author(s)
      Yamashita K, Katsuki T, Akashi K, Kubojima Y
    • Journal Title

      wood density and shrinkage, Bulletin of Forestry and Forest Products Research Institute 9(2)

      Pages: 19-29

    • Peer Reviewed
  • [Journal Article] 絶滅危惧種ヤツガタケトウヒの木材特性の半径方向の変動2010

    • Author(s)
      久保島吉貴、勝木俊雄、明石浩司、山下香菜、鈴木養樹、外崎真理雄
    • Journal Title

      木材学会誌 56(4)

      Pages: 258-264

    • Peer Reviewed
  • [Presentation] ボカスギにおける軸方向の応力解放ひずみの樹幹内分布2011

    • Author(s)
      山下香菜
    • Organizer
      第61回日本木材学会大会
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2011-03-19
  • [Presentation] 応力波伝播速度によるヤツガタケトウヒ生立木の内部腐朽の推定2011

    • Author(s)
      山下香菜、勝木俊雄、藤原健、外崎真理雄、明石浩司
    • Organizer
      第61回日本木材学会大会
    • Place of Presentation
      京都大学(京都市)
    • Year and Date
      2011-03-18
  • [Presentation] Microfibril angle and tracheid length in root wood of Cryptomeria japonica clones2009

    • Author(s)
      Yamashita K
    • Organizer
      7th Pacific Regional Wood Anatomy Conference, Legend hotel
    • Place of Presentation
      Kuala Lumpur
    • Year and Date
      2009-08-05
  • [Presentation] スギ根材の応力解放ひずみ2009

    • Author(s)
      山下香菜
    • Organizer
      第30回根研究集会
    • Place of Presentation
      足寄町銀河ホール(足寄町)
    • Year and Date
      2009-05-09

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Published: 2012-02-13   Modified: 2016-04-21  

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