Characteristic dynamics when removing a hung-up tree by skidding at its butt end in a steep Chamaecyparis obtusa stand(<SPECIAL ISSUE>Safety of newcomers in forestry)

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  • 傾斜地のヒノキ林分において発生したかかり木の元口移動時の力学的特性(<特集>「新規参入者の安全を考える」)
  • 傾斜地のヒノキ林分において発生したかかり木の元口移動時の力学的特性
  • ケイシャチ ノ ヒノキリン ブン ニ オイテ ハッセイ シタ カカリ キ ノ モトグチ イドウジ ノ リキガクテキ トクセイ

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Abstract

The traction for removing hung-up trees by skidding at their butt end was measured in a steep Chamaecyparis obtusa stand. The average maximum traction for removing was 2.29kN (upward felling) and 4.08kN (downward felling). The removing traction in the case of upward felling was significantly smaller than that of downward felling (p<0.05). In comparison with the traction of hung-up trees being passed through the crowns of remaining trees in the preceding study, the traction of upward felling in this study was significantly smaler (p<0.05). However, in the case of downward felling, a significant difference of traction was not shown. The average work for removing was 1.56kJ (upward felling) and 6.70kJ (downward felling), the work of upward felling was significantly smaller (p<0.1). In comparison with the estimated work of hung-up trees being passed through the crowns of remaining trees in the preceding study, the advantage of the method of skidding at the butt end was not shown.

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