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| Simulation and source analysis of nonpoint source nitrogen and phosphorus pollution export in a typical agricultural catchment draining to Chaohu Lake， China |
| Received:March 11, 2022 |
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| KeyWord:export coefficient;eutrophication;agricultural nonpoint source;rainfall;livestock and poultry breeding;domestic sewage;fertilizer;nutrient |
| Author Name | Affiliation | E-mail | | GAO Tiantian | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China
Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | | | XIE Hui | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | hxie@niglas.ac.cn | | WAN Nengsheng | Institute of Lake Ecology and Environment, Chaohu Lake Bureau of Anhui Province, Hefei 238000, China | | | XIONG Zhuyang | Institute of Lake Ecology and Environment, Chaohu Lake Bureau of Anhui Province, Hefei 238000, China | | | HU Zhenghua | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | zhhu@nuist.edu.cn | | LAI Xijun | Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| To investigate the characteristics and sources of nonpoint source（NPS） nitrogen and phosphorus pollution in a typical agricultural catchment draining to Chaohu Lake, the spatial and temporal variations in nitrogen and phosphorus pollution export from the Tongyang River catchment were simulated using an improved export coefficient model based on monitoring data and survey data from 2018 to 2020. Results showed that the average exports of NPS nitrogen and phosphorus pollution in this catchment were（261.33±173.87）t·a-1 and（11.03±9.98）t·a-1 during 2018—2020. The significant inter-annual variation was attributed to radical fluctuations in the hydrologic condition. The headwater sub-catchments were the main contributors to the total NPS nitrogen and phosphorus pollution in the Tongyang River catchment. The annual average export of total nitrogen（TN）was（32.76±21.80）t·a-1 in the Yang River headwater sub-catchment. The average annual export of total phosphorus（TP）in the Tong River headwater sub-catchment was（1.81±1.64）t·a-1, both of which were the highest of all the sub-catchments. The highest exports of TN and TP from domestic sewage and land use were from the Yang River headwater sub-catchment, whereas the highest exports of TN and TP from livestock and poultry breeding were from the Tong River headwater sub-catchment. Croplands contributed 81% and 52% of the NPS nitrogen and phosphorus pollution, respectively. High-intensity fertilizer application was the key issue of NPS pollution in this typical agricultural catchment. The high heterogeneity of the NPS pollution composition indicates the need to focus on critical areas and implement classified measures for controlling NPS pollution in agricultural catchments. |
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