Characteristics and significance of nitrogen, phosphorus and oxygen transportation at the sediment-water interface in east Lake Chaohu

被引：4
|
作者：
Li Y. [1 ,2 ]
Kuang S. [3 ]
Wang Z. [4 ]
Shen Q. [2 ,5 ]
Wang Y. [2 ]
Kang D. [1 ,6 ]
机构：
[1] College of Civil Engineering, Fuzhou University, Fuzhou
[2] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing
[3] Wuhan Hanyang Municipal Construction Group Co, Ltd., Wuhan
[4] Institute of Urban and Industrial Water Management, Dresden
[5] Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan
[6] Jinjiang Science and Education Park of Fuzhou University, Jinjiang
来源：
Hupo Kexue/Journal of Lake Sciences | 2020年 / 32卷 / 03期
关键词：
Dissolved oxygen; Lake Chaohu; Nutrients; Sediment; Sediment-water interface;
D O I：
10.18307/2020.0309
中图分类号：
学科分类号：
摘要：
A comprehensive study of transportation features of nitrogen, phosphorous and dissolve oxygen at the sediment-water interface was carried out in near city areas of east Lake Chaohu. Based on the investigation of sediment nutrients analysis and nutrients release incubation experiments, the release potential and release rates of ammonia nitrogen (NH3-N) and soluble reactive phosphorous (SRP) of different sediments were estimated. The distribution characteristics, diffusion fluxes, and consumption rates of dissolved oxygen (DO) at the sediment-water interface of different sediments were studied by using a non-invasive microelectrode analysis system. The results showed the surface sediments in the near city areas of east Lake Chaohu were in severe nitrogen and phosphorous pollution with high total nitrogen (TN) and total phosphorus (TP) loadings. Typical internal releases of NH3-N and SRP were observed from all sediments with the average release rates of 32.44 mg/(m2•d) and 1.25 mg/(m2•d), respectively. The sediments play the role of pollution source rather than the sink for NH3-N and SRP in the study area. Results also showed that all overlying water were at aerobic condition. The average oxygen penetration depth (OPD) and oxygen diffusion flux at sediment-water micro-interfaces reached 5.3 mm and 4.56 mmol/(m2•d) respectively, indicating good DO diffusion ability from the boundary layer to the sediment. The internal release intensity of NH3-N and SRP are influenced by TN/TP contents of the surface sediment as well as the OPD at the sediment-water interface. The release of NH3-N and SRP from sediments could be benefited from the high nitrogen and phosphorous loadings and low OPD and contribute to the eutrophication of the lake. © 2020 by Journal of Lake Sciences.
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页码：688 / 700
页数：12
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