Economic Valuation of the Agricultural Impact on Nitrogen in the Water Environment by a Newly Proposed Replacement Cost Method
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概要
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Agriculture is multifunctional, and the value of each function should be expressed in a form that is easy for anyone to understand. One function, for example, is water purification, and recently much effort has been expended to quantify this function. The author proposed a new replacement cost method for the economic valuation of the nitrogen (N) removal function of paddy fields and of the N effusing function of upland fields, and then economically valuated cultivated lands Japan-wide. The N removal function of cultivated paddy fields and fallow paddy fields was valued at approximately 0.3 JPY m<SUP>-2</SUP> d<SUP>-1</SUP> and 0.6 JPY m<SUP>-2</SUP> d<SUP>-1</SUP>, respectively, when replaced by the sum of maintenance and depreciation costs of water quality improvement facilities. Upland fields have a negative economic value of approximately 0.08 JPY m<SUP>-2</SUP> d<SUP>-1</SUP>. However, paddy fields function effectively in N removal only when the irrigation water is strongly contaminated with N. Consequently, 85% of the area used for paddy fields does not function in N removal. The use of N-contaminated water from upland fields for paddy field irrigation throughout the year might be environmentally and economically effective with respect to the conservation of water quality in agricultural areas.
- 独立行政法人 国際農林水産業研究センターの論文
著者
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TANJI Hajime
Department of Geotechnical and Hydraulic Engineering, National Institute for Rural Engineering
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TANJI Hajime
Department of Rural Technologies, National Institute for Rural Engineering of Japan, National Agriculture and Food Research Organization
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SHIRATANI Eisaku
Department of Rural Technologies, National Institute for Rural Engineering of Japan, National Agriculture and Food Research Organization
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KIRI Hirohide
Department of Rural Technologies, National Institute for Rural Engineering of Japan, National Agriculture and Food Research Organization
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SHIRATANI Eisaku
Department of Hydraulic Engineering, National Institute for Rural Engineering
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KIRI Hirohide
Department of Geotechnical and Hydraulic Engineering, National Institute for Rural Engineering, National Agriculture and Food Research Organization
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