ドイツ製枝払い装置BaumHexeの枝打ち作業への適用試験 (II) : 枝打ち跡の仕上がりと損傷について

Abstract

前報 (I) に引き続き, 装置による被枝打ち木の仕上がり状態について調べた結果を報告する。枝打ち作業が行われた立木から数本の供試木を抽出し, 樹幹の形状と, 枝打ち跡の状況を調べた。枝打ち跡あるいは損傷は節・傷・残枝に分類した。樹幹の細りと節の発生には明確な関係が認められた。樹幹の特定部位に傷が発生しやすい傾向が認められた。樹幹中心軸の曲がりが強いと, 節や傷の損傷の程度が大きくなる可能性が示唆された。

This report is of the investigation of traces of pruned trees which were mentioned in the former report (I) of this series. We selected some sample trees from pruned trees, measured shape of them and checked traces of pruning. We classified damages of pruning as Node, Slash and Twig. Clear relation between stem's narrowing shape and node occurrence is observed. It seems that slash tends to be made on certain stem position. It is implied that the greater the winding of stem axis, the harder the damage of node and slash.