短 報 (Note

小径木の根株強度について

上村巧・伊藤崇之・広部伸二・田中良明・毛綱昌弘・飯田富士雄


Stump Holding Power of Small Trees

UEMURA Takumi, ITOU Takayuki, HIROBE Shinji, TANAKA Yoshiaki, MOZUNA Masahiro and IIDA Fujio

Abstrast
  Usage of young trees as anchors of yarding operations was discussed. Maximum stump holding power of three species (Larix kaempferi, Cryptomeria japonica and Chamaecyparis obtusa) were measured in Yamanashi prefecture, and the relationships between the inclining angles of the stumps and pulling power were analyzed by a 3D motion analyzer. The stump holding power correlated closely with square of the stump diameters. The inclination with which the stumps show the maximum holding power ware ranged 4 6 degrees. It was concluded that the stumps have lost the function as an anchor when the inclinations were so large that they could be observed.

Key words : stump anchor, stump holding power, inclining angles of stumps

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