Non-destructive diagnosis of the butt heart rot in <i>Chamaecyparis obtusa</i> by the lateral impact vibration method

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  • 横打撃共振法によるヒノキ根株心材腐朽病の非破壊診断
  • ヨコ ダゲキ キョウシンホウ ニ ヨル ヒノキ ネカブ シンザイ フキュウビョウ ノ ヒハカイ シンダン

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Abstract

As a diagnostic method of the butt heart rot in living Chamaecyparis obtusa trees, the lateral impact vibration method that is a simple and non-destructive diagnosis was examined. The index of the diagnosis is the product (D×Fr value) of the resonance frequency (Fr) by lateral impact and the diameter (D) of a tree. D×Fr value of 1481 trees in 16 stands was measured, and the values varied extensively within 13 to 46 cmkHz. In order to show the range of D × Fr values of healthy trees, we cut down 121 trees and investigated on their wood qualities. As a result, the values of 99 healthy trees were distributed within 30 to 42 cmkHz, with the difference among stands or individuals. The relation between the occurrence of hollow or rot and the D × Fr value was examined, using the disks taken from healthy trees or damaged trees. As the hollow or rot area became larger, the D×Fr value decreased. This method could detect the hollow and rot on the disks sensitively.

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