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| Dynamics of endogenous nitrogen release and sedimentation in small water bodies of the Taihu Lake Plain |
| Received:January 06, 2024 |
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| KeyWord:small water body;endogenous pollution;sediment-water interface;endogenous nitrogen release |
| Author Name | Affiliation | E-mail | | ZHANG Shengquan | College of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Institute of Soil Science, Chinese Academy of Sciences, Changshu National Agro-Ecosystem Observation and Research Station, Nanjing 210008, China | | | LIN Han | Institute of Soil Science, Chinese Academy of Sciences, Changshu National Agro-Ecosystem Observation and Research Station, Nanjing 210008, China
College of Agricultural Science and Engineering, Hohai University, Nanjing 211100, China | | | ZHU Yi | Institute of Soil Science, Chinese Academy of Sciences, Changshu National Agro-Ecosystem Observation and Research Station, Nanjing 210008, China
College of Agricultural Science and Engineering, Hohai University, Nanjing 211100, China | | | LIU Xuemei | College of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China | 475483235@qq.com | | XIA Yongqiu | Institute of Soil Science, Chinese Academy of Sciences, Changshu National Agro-Ecosystem Observation and Research Station, Nanjing 210008, China
University of Chinese Academy of Sciences, Nanjing 211135, China | yqxia@issas.ac.cn |
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| Abstract: |
| To investigate the dynamics of endogenous nitrogen release and sedimentation in small water bodies, we conducted continuous monitoring of five such representative water bodies, including ditches, ponds, and streams, of the Taihu Lake Plain water network area from January to November 2023. Samples of the overlying water, sediment, and settling particulate matter were collected monthly, and the nitrogen concentrations and physicochemical factors were determined synchronously. The diffusion fluxes of NH4+ and NO3- at the sedimentwater interface, as well as their sedimentation and endogenous release fluxes, were calculated on the basis of the pore water diffusion model. The results indicated that the endogenous nitrogen released in small water bodies of this water network area was predominantly in the form of NH+4, with the total amount released ranging from 224 to 9 631 kg·km-2·a-1 and the diffusion fluxes ranging from 50 to 312 kg· km-2·a-1, contributing 2.2% to 15.1% to the nitrogen concentration of the water body. Compared with the proportion of endogenous nitrogen contribution from large water bodies, such as rivers and lakes, that from small water bodies was relatively low. Further analysis revealed that the concentration difference between the overlying water and sediment, as well as the flow velocity, were key factors affecting endogenous nitrogen release in small water bodies. Endogenous nitrogen pollution in small water bodies was severe. To effectively reduce such pollution, steps should be taken to strengthen sediment management, strictly control the input of exogenous pollutants, actively enhance the natural purification capacity of water bodies, reasonably regulate the water flow velocity, and establish a complete monitoring and early warning system. |
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