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| Source apportionment of agricultural nonpoint source pollution in the Hanjiang River Basin |
| Received:December 23, 2017 |
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| KeyWord:Hanjiang River Basin;agricultural nonpoint source pollution;equivalent standard pollution load;spatial distribution |
| Author Name | Affiliation | E-mail | | TANG Xiao-yang | College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China | | | TANG De-shan | College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China | tds808@163.com | | LU Jia-hui | College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China | | | CHANG Wen-qian | College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China | | | TANG Xin-yue | College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| Agricultural nonpoint source pollution is an important type of water pollution. To clarify the agricultural nonpoint source pollution load and its spatial distribution in the Hanjiang River Basin, the total nitrogen (TN) and total phosphorus (TP) pollution loads from agricultural nonpoint source pollution of 13 cities in the Hanjiang River Basin in 2015 were estimated according to the export coefficient model approach. Pollution evaluation was carried out using an equivalent standard pollution load method. The spatial distribution of the agricultural nonpoint source pollution load was drawn via GIS. The types of agricultural nonpoint source pollution in the cities of the Hanjiang River Basin were divided through rapid clustering. The results demonstrated that the TN and TP loads from agricultural nonpoint source pollution in the Hanjiang River Basin in 2015 were 179 127 and 26 975 t, respectively, and the corresponding equivalent standard pollution loads were 2.26×1011 and 1.68×1011 m3. In the Hanjiang River Basin, the pollution source with the largest contribution rate of TN standard pollution load was farmland fertilizer, and the pollution source with the largest contribution rate of TP standard pollution load was livestock and poultry breeding. There was a strong consistency in the spatial distribution of TN and TP standard pollution loads, but differences existed among the pollution loads of different cities. Equivalent standard pollution high load areas were concentrated in the middle of the river basin, with the highest in the city of Nanyang. Based on the rapid clustering method, the Hanjiang River Basin could be divided into six types of pollution. Study on pollution load and spatial distribution of the TN and TP from agricultural nonpoint sources pollutants provide a decision reference for the prevention and treatment of nonpoint source pollution in the Hanjiang River Basin. |
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