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

Translated title of the contribution: 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

小林 元, 古賀 信也, 岡野 哲郎, 田代 直明

Research output: Contribution to journalArticle

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.
Translated title of the contributionNon-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
Original languageJapanese
Pages (from-to)119-124
Number of pages6
Journal樹木医学研究
Volume12
Issue number3
Publication statusPublished - Jul 30 2008

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