Temporal–Spatial Variations in Physicochemical Factors and Assessing Water Quality Condition in River–Lake System of Chaohu Lake Basin, China

Li Wu (), Kai Liu (), Ziqi Wang, Yujie Yang, Rui Sang, Haoyue Zhu, Xitong Wang, Yuqing Pang, Jiangshan Tong, Xiangting Liu, Mingyue Ma, Qianqian Wang, Kaijun Ma and Fan Liu
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Li Wu: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Kai Liu: Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences (CAFS), Wuxi 214081, China
Ziqi Wang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Yujie Yang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Rui Sang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Haoyue Zhu: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Xitong Wang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Yuqing Pang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Jiangshan Tong: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Xiangting Liu: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Mingyue Ma: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Qianqian Wang: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Kaijun Ma: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China
Fan Liu: School of Biological and Food Engineering, Hefei Normal University, Hefei 230061, China

Sustainability, 2025, vol. 17, issue 5, 1-19

Abstract: Eutrophication and algal blooms have frequently occurred in Chaohu Lake. Water parameters interact with eutrophication and algal blooms. However, there are few studies on the spatial–temporal characteristics of water parameters in the Chaohu Lake Basin. To assess the water quality of Chaohu Lake and its seven surrounding rivers, 132 samples from 33 sites were collected seasonally from September 2019 to July 2020, and 14 physicochemical parameters were detected. Our results showed that urban rivers had the highest nutrients, chemical oxygen demand (COD Mn , 6.30 ± 0.80 mg/L), five-day biological oxygen demand (BOD 5 , 4.51 ± 0.42 mg/L), and chlorophyll a concentration (Chl a, 54.88 ± 39.81 μg/L); forested rivers had higher water transparency (137.83 ± 18.52 cm), lowest nutrients, COD Mn (4.02 ± 0.20 mg/L), BOD 5 (1.42 ± 0.14 mg/L), and Chl a (7.18 ± 1.41 μg/L); and agricultural and mixed rivers intermediate. Generally, the water quality was “good” and “light-eutrophic” according to the water quality index and trophic level index. The water quality order from good to worst in the season was spring > autumn and summer > winter. These results implied that urban rivers are still the main source of eutrophic nutrients in Chaohu Lake, and the control of urban pollutants is still the core of water quality management in Chaohu Lake.

Keywords: water quality index; trophic level index; Chaohu Lake; spatiotemporal water quality pattern (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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