Release characteristics of inorganic nitrogen in different water layers and its impact on overlying water from Liaohe Ri
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Release characteristics of inorganic nitrogen in different water layers and its impact on overlying water from Liaohe River, China Chen Qiuying1,2 Wang Qi2 Li Zhidong2 Zhang Mingwei2 Sun Manzhong2 ●
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Accepted: 15 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Migration and release of sediment pollutants has become one of the important causes of water pollution, but the contribution of different forms of nitrogen in different water layers to the water quality of the overlying water is unclear. In this study, the main stream of Liaohe River with heavy nitrogen pollution was taken as an example. The static simulation method and related analysis techniques were used to explore the release characteristics of different forms of inorganic nitrogen and its effect on TN and Chla in overlying water from the different water layers. The results showed that the release rates of TN, NH4+-N and NO3−-N from upstream, midstream and downstream sections were different, but the release characteristics of them in different water layers were the same basically. Generally, the inorganic nitrogen in the pore water of the sediment was released to the water body rapidly in the early 0–8 days. The contribution rate of NH4+-N and NO3−-N to the change of TNo was 76.85% for the upstream section, and the contribution rate of NO3−-N to the change of TNo was 65.02% for the midstream section. NH4+-N and NO3−-N in the different water layers from downstream did not showed a significant correlation with TN of overlying water. NO3−-N in sediments was the main contributor of TN and Chla changes in the overlying water and its content can reflect the nitrogen pollution trend of the water body to a certain extent. When the water retention time was 4–16 days, the TLI in the water body was relatively high. After effective control of exogenous pollution, the release of endogenous nutrients in Liaohe River should be paid more attention. Keywords Liaohe River nitrogen release overlying water Chla TLI ●
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Introduction With the application of artificial nitrogen fertilizers (Galloway et al. 2008), industrial wastewater discharge (Gibson et al. 2012) and the increase of specific domestic water (Braga et al. 2000), a large amount of nitrogen is released into the natural water system (Zhu et al. 2019). Ncontaining compounds are essential nutrients for all life forms, but when too much N nutrients enter the aquatic environment, it will cause a series of ecological problems, such as eutrophication, hypoxia events, acidification of
* Chen Qiuying [email protected] 1
Zhuhai Branch of State Key Laboratory of Earth Surface Processes and Resource Ecology, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, 519087 Beijing, China
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College of Life Science, Shenyang Normal University, Shenyang 110034, China
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freshwater ecosystems, and poisoning of benthic organisms and fish etc. (Camargo and Alonso 2006; Bhatnagar and Sillanpää 2011). Eutrophication is usually
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