Natural Drying of Logging Residue Stems along a Forest Road and on a Paved Landing.

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  • Miyata D.
    Graduate School of Agriculture, Kochi University
  • Suzuki Y.
    Faculty of Agriculture, Kochi University
  • Gotou J.
    Faculty of Agriculture, Kochi University

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  • 林道端と舗装土場における林地残材の自然乾燥
  • リンドウバタ ト ホソウ ドバ ニ オケル リンチザンザイ ノ シゼン カンソウ

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Abstract

An experiment on the natural drying of Chamaecyparis obtusa logging residue stems was carried out to determine the potential for use of this material as woody biomass (e.g. wood chip bio-fuel). The experimental residue logs, i.e., unused stems left after logging, were placed along a forest road at high altitude and on a paved landing at low altitude. At each site, half the material was naturally dried in the sun and the other half in the shade for about three months. Moisture content of the logs (MCL; dry basis) was almost constant at the forest road site, while it decreased from 82% to 38% within three months at the paved landing site. There was no significant difference between MCL dried in the sun and in the shade, whereas the MCL placed directly on the ground was about 10% higher than the MC of elevated logs. Average air temperature at the forest road site and at the paved site differed by 7 degrees (higher at the paved site) and average humidity was also 20% higher there. There was no significant effect of substrate type, i.e. soil vs. pavement, as determined by ANOVA. Thus, differences in air temperature and humidity between the sites were the main determinants in natural drying of logging residue stems.

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