基于多光谱遥感技术的高邮湖菹草时空演变及原因分析

为了解高邮湖优势沉水植物菹草剧烈变化的原因及其时空演变对区域水环境的影响，利用2019—2023年长时序多光谱卫星遥感影像，结合现场和水质自动站监测，对高邮湖菹草与水质开展长期观测。结果显示，菹草的生长与水温、浊度等环境因子密切相关，其在生长期对水质具有净化作用，而在衰退期则会产生大量污染物；高邮湖的菹草盖度由2020年的65.5%下降至2023年的5.9%，对区域水质、生物多样性和生态质量指数产生不利影响；菹草的消失与水位变化、藻类影响、鱼类数量及其优势种变化密切相关，高邮湖存在由草型湖泊向藻型湖泊转化的趋势。

Spatiotemporal Evolution and Cause Analysis of Potamogeton crispus L. in Gaoyou Lake Based on Multispectral Remote Sensing Technology

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 dominant 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，turbidity 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 crispus L. in Gaoyou Lake decreased from 65.5% in 2020 to 5.9% in 2023，adversely affecting regional water quality，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.