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| Estimation of spatio-temporal variability and health risks of nitrogen emissions from agricultural non-point source pollution: A case study of the Huaihe River Basin, China |
| Received:October 12, 2017 |
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| KeyWord:Huaihe River Basin;non-point source pollution;pollution loading;spatio-temporal variability;risk assessment |
| Author Name | Affiliation | E-mail | | SONG Da-ping | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | ZUO Qiang | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LIU Ben-sheng | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | ZOU Guo-yuan | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LIU Dong-sheng | Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | llslds@163.com |
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| Abstract: |
| For the purposes of protecting the environment, human health of residents, and revealing the watershed agricultural non-point source pollution load distribution over time, this study adopts the inventory method and pollution discharge coefficient. It analyzes three kinds of pollution sources:livestock breeding, rural life and farmland cultivation, and contribution to total nitrogen(TN) emissions and emissions intensity in 35 cities of the Huaihe River Basin. The spatio-temporal variability of non-point pollution sources was presented based on geographic information system analysis. Furthermore, the potential health risks of nitrate/nitrogen in groundwater were estimated according to the health risk assessment model. The results showed that the TN emissions of rural life, farmland cultivation, and livestock breeding were 4.22×105 t, 6.44×106 t, and 2.14×106 t, respectively, in the Huaihe River Basin in 2015. Rural life, farmland cultivation, and livestock breeding measured emissions were correspondingly 3.58%, 72.39%, and 24.03%. Fertilizer use was still the main source of nitrogen pollution. Farmland nitrogen pollution due to field fertilization was the greatest, but livestock and poultry farming also showed greater contributions than that of rural life. Farm field planting mainly contributed to surface water nitrogen pollution loads, but other sources contributed significantly to total loading rates and present significant regional spatial variability. The northwest area of the Huaihe River Basin showed higher nitrogen loading than the southeast. In terms of groundwater, nitrate health risk indexes ranged from 0.49 to 3.18, exceeding the health risk threshold "1", which accounts for 82.86% of the entire Huaihe River Basin. We proposed that it was necessary to pay more attention to the safety of drinking water. |
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