Estimating the Economic Effect of Heavy Thinning on the Water Resource Storage Function of Dense Japanese Cypress Plantations

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  • NANKO Kazuki
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • ONDA Yuichi
    Graduate School of Life and Environmental Sciences, University of Tsukuba
  • FUKADA Keisaku
    Agriculture, Forestry and Fisheries Department, Yamaguchi Prefecture
  • NONODA Toshiro
    Forestry Research Institute, Mie Prefecture
  • YAMAMOTO Kazukiyo
    Graduate School of Bioagricultural Sciences and School of Agricultural Sciences, Nagoya University
  • TAKENAKA Chisato
    Graduate School of Bioagricultural Sciences and School of Agricultural Sciences, Nagoya University
  • HIRAOKA Marino
    Graduate School of Life and Environmental Sciences, University of Tsukuba

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Other Title
  • 荒廃ヒノキ人工林の強度間伐が森林水源涵養機能に与える経済効果の試算
  • コウハイ ヒノキ ジンコウリン ノ キョウド カンバツ ガ シンリン スイゲンカンヨウキノウ ニ アタエル ケイザイ コウカ ノ シサン

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 To investigate the effects of heavy thinning in dense Japanese cypress plantations, this study estimated the economic effect of recovery of the water resource storage function and water quality sanitization function of a forest. The two functions were quantified by the water resource storage rate before and after heavy thinning; the rate was calculated by the infiltration rate measured in the field using an oscillating nozzle rainfall simulator and meteorological data. Water storage increased after thinning; this increase was converted to a monetary value using the substitute method. The following thinning was assumed: tree density decreased from 3,500 to 1,850 trees per ha; surface vegetation cover changed from 0 to 100 % in 3 years, with 100 % vegetation cover continuing another 7 years; and the final maximum infiltration rate increased from 20.7 to 179.8 mm/h. The resulting water resource storage rate changed from 0.332 before thinning to 0.471 after thinning. The economic effects in the 10 years after heavy thinning were estimated to be 78.4 million yen/km2 for the water resource storage function and 136 million yen/km2 for the water quality sanitization function. Although the values should be verified using future long-term hydrological monitoring data, the study suggests a relatively simple method, involving field-measured infiltration rates, to estimate the economic effect of thinning on the water cultivation function of a forest.

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