Economic Valuation of the Agricultural Impact on Nitrogen in the Water Environment by a Newly Proposed Replacement Cost Method
ISSN | 00213551 |
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書誌レコードID(総合目録DB) | AA0068709X |
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-2 d-1 and 0.6 JPY m-2 d-1, 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-2 d-1. 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.
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作成者 | SHIRATANI Eisaku KIRI Hirohide TANJI Hajime |
著者キーワード |
Japanese yen paddy field upland field wetland |
公開者 | Japan International Research Center for Agricultural Sciences |
オンライン掲載日 | |
国立情報学研究所メタデータ主題語彙集(資源タイプ) | Journal Article |
巻 | 42 |
号 | 4 |
開始ページ | 285 |
終了ページ | 289 |
DOI | 10.6090/jarq.42.285 |
権利 | Japan International Research Center for Agricultural Sciences |
言語 | eng |