Abstract
Poyang Lake is an internationally important wetland, the largest migratory bird habitat in Asia, and the largest freshwater lake in China. Its ecological environment has a wide range of international attention and influence. The dish-shaped lake is a seasonal sub-lake exposed on the beach during the dry season of Poyang Lake. Its special hydrological and geomorphic characteristics provide a good habitat for more than 80% of the lake’s wintering migratory birds. On the other hand, the widely distributed dish-shaped lakes with varying heights effectively alleviated the impact of drought and flood disasters on the Poyang Lake wetland ecosystem, and is of great significance to maintaining the stability of the Poyang Lake basin ecosystem and biodiversity. Compared with the breadth and depth of research on the water ecosystem of the main lake area of Poyang Lake, the dish-shaped lake has received less attention. This study takes Poyang Lake's dish-shaped lake as the research object, based on long time series remote sensing data, it analyzes the water area, water-sediment, and the spatio-temporal dynamic characteristics of vegetation from different time scales (month, quarter, and year); combined with nature and social economy Data analysis of the driving factors of its changes. On this basis, the ecological effects brought by the dynamic changes of the dish-shaped lake water area were discussed from the aspects of migratory bird habitat changes and agricultural production, in order to lay a foundation for the protection of wintering migratory birds and their habitats in the region, and to maintain the Poyang Lake ecosystem Provide guidance on safety and biodiversity.
Highlights
The dish-shaped lake is a shallow dished depression formed in the process of uneven deposition due to the interaction of current and sediment in the estuary Delta [1]
With the change of water area in the lake area, the saucer lake appears seasonally: in the wet season, the saucer lake is connected with the main lake area; in the dry season, the saucer lake is separated from the main lake
233.76 311.53 344.12 704.51 678.84 734.52 753.70 751.53 752.85 746.16 581.85 fluctuation 88.46 179.78. It can be seen from table 1 that during the whole study period, the monthly average water area of saucer Lake area fluctuated between 170 km2~ 640km2, the maximum values were all more than km2, and the minimum values were all lower than 300 km2
Summary
The dish-shaped lake is a shallow dished depression formed in the process of uneven deposition due to the interaction of current and sediment in the estuary Delta [1]. The dish shaped lakes of Poyang Lake are densely distributed around the lake basin, and the total area accounts for 22.25% of the total area of Poyang Lake [3]. This area is the location of Poyang Lake National Nature Reserve [4]. With the change of water area in the lake area, the saucer lake appears seasonally: in the wet season, the saucer lake is connected with the main lake area; in the dry season, the saucer lake is separated from the main lake. Dish shaped lakes vary in size and shape, surrounded by artificial high lake levees separated from the river water area [5]. The hydrological and geological processes are affected by the main lake area, and by the rivers entering the lake, creating complex and diverse freshwater biological communities, and reflecting the historical process of hydrological situation and geomorphic evolution to a certain extent
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