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| Spatio-temporal changes and distribution characteristics of pollutant loads from agricultural non-point sources in Nyingchi, Tibet |
| Received:April 06, 2017 |
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| KeyWord:agricultural non-point source;TN;TP;Nyingchi;distribution characteristics |
| Author Name | Affiliation | | HAO Shou-ning | XiZang Agriculture and Animal Husbandry College, Nyingchi 860000, China | | FU Yi-cheng | China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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| Abstract: |
| This paper is aimed at analyzing the trends and characteristics of agricultural non-point source pollution in Nyingchi,Tibet.The annual emission loads of total nitrogen (TN) and total phosphorus (TP) from the agricultural non-point source pollution were estimated by applying the export coefficient model to the statistical data of agriculture in Nyingchi from 2000-2015.The agricultural non-point source pollution can be caused by rural domestic sewage,application of chemical fertilizers,and livestock and poultry breeding.TN and TP showed a steady upward trend year by year.The loads of agricultural non-point pollution were higher in the Gongbujiangda,Bomi,and Nyingchi counties,whereas that in the Milin county was the highest.The pollution load of TN and TP owing to livestock and poultry breeding showed a significant increasing trend with time among the three nutrient sources.Overall,90% of the agricultural non-point source pollution load resulted from livestock and poultry breeding and the application of chemical fertilizers.Importantly,the situation of the agricultural non-point source pollution in Nyingchi is not optimistic,especially in the developed areas of agriculture and animal husbandry.It is necessary to carry out prevention and control measures for improving the situation of agricultural non-point source pollution in this district. |
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