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| Estimating Contribution of Agricultural Sources to Aquatic Nitrogen Load in Taihu Lake Region:A Case Study of Yili River Catchment |
| Received:July 01, 2015 |
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| KeyWord:Yili River catchment;agricultural source pollution;aquatic N load |
| Author Name | Affiliation | E-mail | | LUO Yong-xia | College of Resources and Environment Science, Nanjing Agricultural University, Nanjing 210095, China
State Key Laboratory of Soil and Sustainable Agricultural, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | GAO Bo | College of Resources and Environment Science, Nanjing Agricultural University, Nanjing 210095, China
State Key Laboratory of Soil and Sustainable Agricultural, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YAN Xiao-yuan | State Key Laboratory of Soil and Sustainable Agricultural, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | JIANG Xiao-san | College of Resources and Environment Science, Nanjing Agricultural University, Nanjing 210095, China | gis@njau.edu.cn | | TI Chao-pu | State Key Laboratory of Soil and Sustainable Agricultural, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | cpti@issas.ac.cn |
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| Abstract: |
| Taihu Lake region is densely populated, along with developed industry and intensive agriculture. The surface water pollution, especially eutrophication, has seriously affected both water supply and economic development in this region in recent years. Nitrogen(N) is a major pollutant in the surface water in this region. The Yili River catchment is a main upper catchment of the Taihu Lake. Hence, identifying the sources of N loads would help manage N fertilizers and water resources and reduce surface water pollution effectively. In this study, three main sources of agricultural source pollution including cropland, livestock and poultry husbandry, and aquaculture were analyzed through survey, monitoring, remote sensing, and use of statistical data and GIS technologies. Results showed that the total N load in this catchment was 6861 t in 2013, with an average of 22.2 kg·hm-2. Cropland, livestock and poultry husbandry were the main sources of N pollution in this catchment, which was 3832 t and 2358 t, accounting for 56% and 34% of the total agricultural N loads, respectively. The N load from aquaculture was only 9.8% of the total agricultural N loads.Vegetable land was one of the major N pollution sources of cropland, amounting to 18.7% of the total agricultural N. Therefore, policies and managements of water N pollution control should be focused on vegetable systems in this area. |
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