Long time series multi-spectral satellite remote sensing,field monitoring and automatic water quality monitoring were used to carry out long-term observation of Potamogeton crispus L.and water quality in Gaoyou Lake from 2019 to 2023 to understand the causes of drastic changes of Potamogeton crispus L.,the domi-nant submerged plant in the lake,and the impact of its spatiotemporal evolution on regional water environment.The results indicated that the growth of Potamogeton crispus L.was closely related to water temperature,turbidi-ty and other environmental factors.Potamogeton crispus L.could purify water quality during its growing period,while it would produce a large amount of pollutants during its declining period.The coverage of Potamogeton cris-pus L.in Gaoyou Lake decreased from 65.5％in 2020 to 5.9％in 2023,adversely affecting regional water quali-ty,biodiversity,and ecological quality index.The disappearance of Potamogeton crispus L.was closely related to the changes in water level,the impact of algae,the number of fish and the changes in dominant fish species.Gaoyou Lake had a tendency of transforming from macrophtic lake to algal lake.
关键词
菹草/时空演变/多光谱遥感/环境因子/浅水湖泊
Key words
Potamogeton crispus L./Spatial-temporal evolution/Multispectral remote sensing/Environ-mental factors/Shallow lake
维普
万方数据