Evaluation of pollution statues and the influencing factors in sediment in Bao’an Lake, Hubei Province
LIU Jiahao，LI Yan*，SHEN Dongfang，MA Shuonan，QIAO Ruiting，MAO Hui
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1.College of Fisheries and Life Science，Dalian Ocean University，Dalian 116023，China；2.State Key Laboratory of Freshwater Ecology and Biotechnology，Institute of Hydrobiology，Chinese Academy of Sciences，Wuhan 430072，China；3.University of Chinese Academy of Sciences，Beijing 100049，China；4.School of Marine Sciences，Ningbo University，Ningbo 315211，China；5.Bao’an Lake National Wetland Park Management Committee，Huangshi 435112，China
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Published
2023-11-06
Issue Date
2023-11-06
Abstract
In order to understand the situation of sediment pollution in Bao’an Lake, single-factor pollution index, comprehensive pollution index, and organic pollution index were used to analyze the pollution status of total nitrogen (TN), total phosphorus (TP) and organic matter (OM) based on the seasonal investigation of sediments in 12 sampling sites in Bao’an Lake from July 2020 to April 2021. The results showed that there was content of (3.56±0.79)g/kg in TN, (0.57±0.20)g/kg in TP, and (59.66±16.27)g/kg in OM in the surface sediment of Bao’an Lake, with the maximal levels of TN, TP, and OM in winter, and lower in summer in the four lake areas. Such seasonal differences in sediment nutrients were primarily involved in changes in water temperature, phytoplankton, aquatic plants, microbial activity, dissolved oxygen, and external organic matter input in different seasons, with the maximal levels of both TN and OM in Biandantang located in the north Bao’an Lake and the minimal levels in the main Lake located in the south of Bao’an Lake. The maximal level of TP was observed in Xiaosihai located in the north Bao’an Lake, while the minimal in Biandantang. Aquaculture effluent from the surrounding intensive fish ponds and domestic sewage from the surrounding towns were the main factors resulting in the higher nutrients content of sediments in northern Bao’an Lake. The single-factor pollution index and the comprehensive pollution index showed that Bao’an Lake was heavily polluted, and the organic pollution index revealed an organic pollution problem. The findings indicated that the pollution status of Bao’an Lake was heavy, and maybe heavier in the future if external pollution persists. Therefore, it is urgent to carry out a series of measurements such as nutrient reduction and ecological restoration to control the eutrophication of Bao’an Lake.
LIU Jiahao, LI Yan, SHEN Dongfang, MA Shuonan, QIAO Ruiting, MAO Hui.
Evaluation of pollution statues and the influencing factors in sediment in Bao’an Lake, Hubei Province[J]. Journal of Dalian Fisheries University, 2023, 38(4): 680-688 https://doi.org/10.16535/j.cnki.dlhyxb.2022-337
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