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| Assessing Risk of Non-point Source Phosphorus Loss and Identifying Critical Source Areas in a Chinese Highland Agricultural Watershed |
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| KeyWord:phosphorus index; phosphorus loss; particulate phosphorus; dissolved phosphorus; critical source areas |
| Author Name | Affiliation | | LI Wen-chao | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LIU Shen | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LEI Qiu-liang | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | ZHAI Li-mei | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | WANG Hong-yuan | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LUO Chun-yan | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LIU Hong-bin | Key Laboratory of Nonpoint Pollution Control, Ministry of Agriculture, Beijing 100081, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | REN Tian-zhi | Institute of Agro-Environmental Protection, Ministry of Agriculture, Tianjin 300191, China |
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| Abstract: |
| Based on Iowa P index model and other P index evaluation systems, a Highland Agricultural Watershed P Index Evaluation System（HAWPES） was developed and used to assess the risk of P loss and identify critical source areas by taking Fengyu River watershed, Yunnan Province as an example. Phosphorus losses in dissolved（runoff） and particulate（erosion） forms were assessed. High risk areas of P loss were located within the extent of 100 meters away from both sides of the river. Dissolved P losses mainly occurred in the farmland areas in middle and lower parts of the river, while particulate P losses happened both in farmland areas in middle and lower parts of the river and in the meadows in the upper part of the river. These results provide a basis for an effective and efficient watershed environmental management plan. The study reveals that this new P index evaluation system could be applied successfully to assessment of P loss risk and identification of critical source areas for watershed best environmental management. |
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