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| Nitrogen migration characteristics in farmland in plain river network area based on HYDRUS-1D model |
| Received:May 17, 2021 |
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| KeyWord:HYDRUS-1D;plain river network area;aeration zone;nitrogen migration;groundwater environment |
| Author Name | Affiliation | E-mail | | XU Xueting | Nanjing Institute of Environmental Science, Ministry of Ecological Environment, Nanjing 210042, China | | | BAN Ruxue | Nanjing Institute of Environmental Science, Ministry of Ecological Environment, Nanjing 210042, China
College of Environment, Hohai University, Nanjing 210098, China | | | JIN Youjie | Nanjing Automation Institute of Water Conservancy and Hydrology, Nanjing 210012, China | | | ZHANG Yimin | Nanjing Institute of Environmental Science, Ministry of Ecological Environment, Nanjing 210042, China | zym7127@163.com | | GAO Yuexiang | Nanjing Institute of Environmental Science, Ministry of Ecological Environment, Nanjing 210042, China | | | XU Haojie | Nanjing Institute of Environmental Science, Ministry of Ecological Environment, Nanjing 210042, China
College of Environment, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| Based on the actual situation of the study area, the HYDRUS-1D model was used to simulate the migration characteristics of water and nitrogen in a plain river network area. The model parameters were calibrated and validated by combining field monitoring and indoor leaching experiments; therefore, vertical migration and loss of nitrogen in the research area were simulated using this verified model. The results showed that urea was hydrolyzed largely in the surface soil and was mainly distributed in 0~5 cm depth of the soil layer. Ammonia nitrogen and nitrate nitrogen were mainly distributed in 0~15 cm and 0~35 cm depths of the soil layer, respectively. The concentrations of these two pollutants basically showed the same tendency:both increased first and then decreased with increasing soil depth. It was estimated that when the soil depth increased by 10 cm, the nitrate-nitrogen concentration decreased by 10 mg·L-1, which meant that nitrate-nitrogen entered deep soil easily. Ammonia nitrogen loss owing to irrigation was clearly observed, especially when the irrigation amount was greater than 400 mL; however, nitrogen loss increased exponentially. Meanwhile, the amount of nitrogen entering into the groundwater environment in the plain river network area was much higher than that in the type Ⅲ water quality standard, considering natural rainfall, input of exogenous pollutants, and soil background value. |
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