Non-destructive diagnosis of wood decay in larch trees using a stress wave velocity measurement : case studies in the research forests of Kyushu and Shinshu Universities

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Other Title
  • 応力波伝播速度測定によるカラマツ生立木の非破壊腐朽診断—九州大学北海道演習林と信州大学野辺山ステーションにおける調査事例—
  • 応力波伝播速度測定によるカラマツ生立木の非破壊腐朽診断--九州大学北海道演習林と信州大学野辺山ステーションにおける調査事例
  • オウリョクハ デンパ ソクド ソクテイ ニ ヨル カラマツ ナマタチキ ノ ヒハカイ フキュウ シンダン キュウシュウ ダイガク ホッカイドウ エンシュウリン ト シンシュウ ダイガク ノベヤマ ステーション ニ オケル チョウサ ジレイ

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Abstract

Stress-wave velocity of the trunk in the transverse direction was investigated in 50-year old Larix kaempferi stands in the research forests of Kyushu and Shinshu Universities. The frequency distribution of stress-wave velocity classes of sound trees was normally distributed. However, because the stress-wave velocities of decayed trees were lower than those of sound trees, the stress-wave velocity classes exhibited a J-shaped frequency distribution in stands with decayed trees. The slope of the linear regression between the percentage of the decayed portion along the diameter of the trunk and stress-wave velocity (km・s-1) ranged from -0.011 to -0.015. The y-intercept of the linear regression conformed to the average of the stress-wave velocity of sound trees. These findings provide effective information in diagnosing wood decay using stress-wave velocity measurements.

Journal

  • Tree and Forest Health

    Tree and Forest Health 12 (3), 119-124, 2008-07-30

    Tree Health Research Society, Japan

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