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| DOI：10.13522/j.cnki.ggps.2017.0349 |
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| Analysis of the Pollutants Discharged from Nonpoint Agricultural Pollution Sources in Nyingchi |
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HAO Shouning, BAI Qingqin, ZHANG Zhiwei , DONG Fei
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1.Tibet Agriculture and Animal Husbandry College, Nyingchi 860000, China; 2.China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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| Abstract: |
| 【Objective】 Environment contamination caused by nonpoint agricultural pollution sources has become a concern and this paper aims to analyse the distribution of contaminants emanating from nonpoint pollution sources in agricultural production, as well as the heavily polluted area in Nyingchi.【Method】 The pollution loads from agricultural nonpoint pollution sources in seven counties in Nyingchi were estimated using the export coefficient model with total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) produced from domestic disposal, fertilizer application and livestock production as the targeted pollutants.【Result】 The COD, TN and TP loads were 72 053.57 t, 4 864.50 t and 765.56 t, respectively, in 2014. The areas with high pollution load included Gongbujiangda, Bom and Milin counties, and the contribution of each sector to the pollution load was ranked in livestock>farmland fertilizer> domestic disposal. 【Conclusion】 The livestock production is the key pollution source in Nyingchi. Gongbo'gyamda and Mainling County are the main controlling areas of nonpoint source pollution. |
| Key words: agricultural nonpoint source pollution; pollution load; export coefficient; Nyingchi |
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