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| Agricultural non-point source pollution discharge characteristic and its control measures of Dongtinghu Lake |
| LU Shao-yong1, ZHANG Ping1,2, PAN Cheng-rong2,3, PENG Shu-chuan2, LIU Xiao-hui1 |
1. Engineering and Technology Center of Lake, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Research Centre of Lake Environment, State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;
3. China Anhui Institute of Environmental Science, Hefei 230009, China |
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Abstract To clarify the spatial characteristics of agricultural non-point source pollution in Dongtinghu Lake. Pollution loads from agricultural nonpoint sources in Dongtinghu Lake were estimated and evaluated according to the approach of export coefficient modeling as well as the equal standard pollution method. In addition, spatial distribution of non-point source pollution load was drew by GIS. The results demonstrated that total nitrogen and total phosphorus loads in Dongtinghu Lake respectively were104556.9t/a, 12719.02t/a; 103643.71t/a and 13032.79t/a in 2010 and 2014. The magnitude order of the contribution to various types of pollutant sources was as following, 1) dry land > paddy field > livestock and poultry breeding > forest land > rural life for total nitrogen load; 2) livestock and poultry breeding > dry land > paddy field > woodland > rural life for total phosphorus load, respectively. Dry land and livestock farming was the main source of agricultural non-point source pollution load. For the spatial regularity, the space TN, TP pollution distribution is consistent, but regional differences between TN and TP in the output load. The priority control areas were Taoyuan county, HanShou, Lixian, Ding cheng, Nanxian, Anhua, Huarong, where the ANP output load was high. With clustering analysis method, the agricultural non-point source pollution was divided into 4types of pollution, and control countermeasures were put forward.
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Received: 18 September 2016
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