Effects of logging systems and bucking strategies on profits from sugi (<i>Cryptomeria japonica</i>) plantations

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  • Suzuki Komei
    Graduate School of Agricultural and Life Sciences, the University of Tokyo Mombetsu Forestry Office, Forestry Department, Sumitomo Forestry Co. Ltd.
  • Tatsuhara Satoshi
    Graduate School of Agricultural and Life Sciences, the University of Tokyo
  • Nakajima Tohru
    Graduate School of Agricultural and Life Sciences, the University of Tokyo
  • Kanomata Hidesato
    Forestry and Forest Products Research Institute, Forest Research and Management Organization
  • Oka Masaru
    University Forests, Faculty of Agriculture, Kagoshima University

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Other Title
  • 作業システムと採材方針がスギ人工林の収益に与える影響
  • 作業システムと採材方針がスギ人工林の収益に与える影響 : 山形県鶴岡市温海地区民有林の事例
  • サギョウ システム ト サイザイ ホウシン ガ スギ ジンコウリン ノ シュウエキ ニ アタエル エイキョウ : ヤマガタケン ツルオカシオンカイ チク ミンユウリン ノ ジレイ
  • －山形県鶴岡市温海地区民有林の事例－
  • Case studies of private forests in Atsumi District, Tsuruoka City, Yamagata Prefecture

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Abstract

<p>To assess potential increases in profitability of privately owned sugi (Cryptomeria japonica) plantations in Atsumi District, Tsuruoka City, Yamagata Prefecture, Japan, we simulated effects of two strategies. One was a traditional strategy involving use of a logging system with cable yarders to intend to produce high-price logs, and the other was an efficient strategy involving use of a logging system with high-performance forestry machines to mass-produce regular logs. We calculated forest rent per ha per year for each strategy by site class and cutting age, changing the maximal height where A-grade logs could be bucked and the ratio of numbers of crooked trees to total trees. The efficient strategy resulted in higher forest rents per year than the traditional strategy in almost all cases, showing that it was usually more profitable,despite standardizing the bucking to produce regular A-grade logs. The findings suggest that changing from a traditional management strategy to an efficient strategy with a high-density forest road network and highperformance forestry machines should increase the profitability of sugi plantations at hypothetical stand level.</p>

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