Poyang Lake is one of the main tributaries in the middle and lower reaches of the Yangtze River, and it is also an important lake with water, throughput and seasonality in the Yangtze River basin. The area of the lake is flat (14m ~15m) 3150 square kilometers, and advanced (20m)4 125 square kilometers. But at the low water level (12m), it is only 500 square kilometers. According to the hydrological data in 2008, when the water level of the lake is 22.59 meters, the lake area is 4070 square kilometers.
Significance of Poyang Lake
Poyang Lake has a certain regulating effect on the water quantity of the Yangtze River. Usually April-September is the flood season, and June-March is the dry season. From April to June, the water level rises with the flood of the Five Rivers, and the high water level is maintained from July to September due to the jacking or backward flow of the Yangtze River flood.
When the water level of the lake is higher than that of the Yangtze River, it can supplement the flow of the Yangtze River and increase the low flow of the Yangtze River by about 8 billion cubic meters. On the contrary, when the river flows backward into the lake, the maximum backward flow reaches 93 1 100 million cubic meters, and the water transfer effect is obvious.
Poyang Lake is an important wetland in the world and an important storage lake in the main stream of the Yangtze River. It has played a great role in storing floods and protecting biodiversity in the Yangtze River Basin of China. It is the largest "kidney of the mainland" in China, one of the top ten ecological function protection zones in China, the only member of the World Life Lake Network in China, and one of the world's important ecological zones designated by WWF, and plays an important role in maintaining regional and national ecological security.