Estimating the Dry Weight of Logging Residues in Thinned Stands of Cryptomeria japonica.

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  • Kunisaki T
    Faculty of Agriculture, Iwate University
  • Mitsuishi U
    Graduate School of Agriculture, Iwate University
  • Ito H
    Faculty of Agriculture, Iwate University Sumitomo Forestry Co., Ltd.
  • Sato K
    Graduate School of Agriculture, Iwate University
  • Sawabe O
    Faculty of Agriculture, Iwate University

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Other Title
  • スギ間伐林における林地残材乾重の推定
  • スギ カンバツリン ニ オケル リンチ ザンザイ カンジュウ ノ スイテイ

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Abstract

We investigated the dry weight of logging residues in thinned stands of Japanese cedar (Cryptomeria japonica) of various ages. The dry weight of the logging residue in each stand was estimated at 13.138.4t•ha-1 from plot inventories. Stepwise multiple regression analysis showed that stand volume, relative density, and thinning ratio significantly affected the ratio of wasted log volume to thinned volume. Furthermore, stand age and time after thinning significantly affected the dry weight of wasted branches and leaves. Analysis of covariance showed that the dry weight of the wasted leaves and secondary branches decreased with time after thinning. In conclusion, the usable dry weight of logging residue can be estimated from stand development stage, stand density management, and the time when logging residues were harvested.

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