The aquatic ecological health-state assessment and the influencing mechanism of Poyang Lake
Yanhui Zhang
A * , Bing Li B C , Hongyun Zhu A , Guishan Yang B C , Yongjiu Cai B C , Rongrong Wan B C and Xiaolei Wang A
+ Author Affiliations
- Author Affiliations
A Nanjing Xiaozhuang University, Nanjing, 211171, PR China.
B Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, PR China.
C College of Nanjing, University of Chinese Academy of Sciences, Nanjing, 211135, PR China.
Marine and Freshwater Research 74(10) 807-816 https://doi.org/10.1071/MF22154
Submitted: 18 August 2022 Accepted: 9 December 2022 Published: 16 February 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: Freshwater lakes are still facing a series of problems, e.g. a decline in water quality, and a decrease in biodiversity. Thus, assessing the state of aquatic ecological health of the lake has drawn widespread attention from scholars both at home and abroad.
Aims: This study aims to assess the state of aquatic ecological health of Poyang Lake and analyse the influencing factors.
Methods: The long-term (2007–2018) site-monitoring data were analysed on the basis of the extension–evaluation method and correlation-analysis method.
Key results: The results showed that the aquatic ecological health was mainly ‘good’, and remarkable seasonal differences were observed. The seasonal order of relative aquatic ecological health could be expressed as the wet season being better than the dry season, whereas the rising season was similar to the retreating season. And the pollutant discharged into the lake was found to be the key factor, and the hydrological conditions led to seasonal differences in the state of aquatic ecological health of Poyang Lake.
Conclusions: Consequently, scholars and policymakers should focus on both nutrient concentrations and hydrological conditions, which are the key factors influencing the aquatic ecological health of Poyang Lake.
Implications: The results of this study have provided a theoretical and practical basis of the causes of ecological deterioration and should help with ecological-health protection of the large lakes connected with the Yangtze River.
Keywords: aquatic ecological health assessment, extension–evaluation method, eutrophication level, good, hydrological conditions, influencing mechanism, Poyang Lake, seasonal variations.
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