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| Isotopic tracer analysis of nitrate nitrogen pollution contribution in the Beichengzi River basin， China |
| Received:March 02, 2022 Revised:May 16, 2022 |
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| KeyWord:stable isotope;IsoSource model;nitrate nitrogen;contribution rate |
| Author Name | Affiliation | E-mail | | GAO Yuexiang | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | LI Xiang | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China
College of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 211800, China | | | GAO Tiantian | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | ZHANG Yimin | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China
College of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 211800, China | zym7127@163.com | | CHEN Ting | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | | | ZHANG Zhiwei | Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China | |
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| Abstract: |
| The Beichengzi River basin is the planned area for pollution control of the National South-to-North Water Diversion Project. Traceability analysis of nitrate nitrogen pollution in the basin was conducted to address the inability to stably maintain the standard of water quality in the state-controlled section of Beichengzi River, and to ensure the safety of water quality in the South-to-North Water Diversion Project. Based on the stable isotope technology and the IsoSource model, in this study, we used the NO3-/Cl- and isotope ratios to quantitatively analyze the Beichengzi River basin for four sources of nitrate nitrogen pollution： aquaculture wastewater, domestic sewage, livestock and poultry breeding wastewater, and farmland planting discharge sources. From the perspective of spatial distribution, the main source of nitrate nitrogen pollution in the upper reaches of the Beichengzi River originated from aquaculture, but the nitrate nitrogen content in the water body from upstream to downstream gradually increased owing to the influence of domestic sewage. From the perspective of time distribution, the highest pollution contribution rate, ranging from 26.3% to 73.6%, was from aquaculture in the highwater period. Aquaculture and domestic sewage were the main sources during the flat water period, and their contribution rates were 18.8%-37.2% and 26.0%-35.6%, respectively. In the drought period, the contribution rate of each pollution source was identical. Overall, in the Beichengzi River basin, the highest contribution rate of nitrate nitrogen pollution is from domestic sewage and aquaculture sources, followed by livestock and poultry breeding sources, with the lowest contribution rate is from farmland planting sources. |
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