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[Evaluation of eutrophication level changes in Baiyangdian Lake based on multiple biological groups]
Dai-Kui Li1,2, Ping He1,2, Cun-Qi Liu3
1Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|December 24, 2021
Summary
Water quality in Baiyangdian Lake significantly improved after ecological water replenishment and pollution control. Key indicators like total phosphorus and nitrogen decreased, enhancing the lake
Area of Science:
- Environmental Science
- Limnology
- Ecology
Background:
- Baiyangdian Lake faced severe eutrophication and declining water levels due to reduced upstream water and sewage discharge.
- Establishment of Xiong'an New Area highlighted the need for environmental governance and protection of Baiyangdian Lake.
Purpose of the Study:
- To assess the current water quality of Baiyangdian Lake in August 2019.
- To evaluate the effectiveness of ecological water replenishment and pollution control projects implemented since 2017.
Main Methods:
- Investigated water physicochemical variables and aquatic organisms (phytoplankton, zooplankton, macrozoobenthos).
- Compared 2019 data with 2010 survey data for water quality assessment.
- Utilized submerged macrophytes to evaluate the water ecological status.
Main Results:
- Significant improvements in water quality observed: total phosphorus decreased by 88.6%, total nitrogen by 83.9%, chlorophyll a by 47.8%, and Secchi depth increased by 43.4%.
- Increased diversity of zooplankton and macrozoobenthos, reduced phytoplankton density, and a shift in phytoplankton community from highly eutrophic to eutrophic type.
- Submerged macrophytes and zooplankton diversity were found unsuitable for water quality evaluation in this specific context.
Conclusions:
- Ecological water replenishment and pollution control projects have greatly improved Baiyangdian Lake's water quality.
- Hydrodynamic conditions have changed, leading to a homogenization of water quality across the lake, particularly in the west following pollution control efforts.
