Causes of wetland area change in Dongting Lake

(1) area becomes smaller (2) precipitation decreases and evaporation increases; Long-term siltation (3) Reclaiming land from lakes; Deforestation in the basin has greatly increased the sediment content of the Yangtze River and its tributaries, and accelerated lake siltation. (4) Maintain biodiversity, store floods, provide abundant agricultural and sideline products, and conduct shipping and sightseeing. (5) The area becomes smaller and the depth becomes shallower, which weakens the ability to adjust the seasonal variation of runoff; Large areas of wetlands are disappearing. (6) Strengthen afforestation, returning farmland to forests, returning farmland to lakes, relocating towns, dredging rivers, etc.