Reasons for the decrease of Caohai area in Guizhou

1. Caohai, Guizhou is the largest karst tectonic lake in China, but in recent years, the continuous sunny and hot weather has led to a decrease in precipitation, which is less than normal 10-70%. This led to a sharp decline in the water area of Caohai, even less than 15 square kilometers.

2. The decrease of Caohai water area is also related to artificial drainage, farmland reclamation and other activities. These activities directly led to the reduction of Caohai water area by more than 20 square kilometers.