Climate Change and Its Impact on Desertization around Qinghai Lake

The climatic variation tendencies and jump phenomena of air temperature, precipitation, evaporation and etc around Qinghai Lake since 1976 are analyzed and verified. The result shows that the four seasons and the annual mean precipitation and air temperature are increasing. Among them, this tendency is more significant in autumn and winter. The annual mean precipitation and precipitation in spring, summer and winter have been decreased since 90s, especially, in the autumn, its linearity variation rate is -7.28 mm/10a; each season and annual evaporation appear to increase, its linearity variation rate of year and summer is 11.7 and 9.39 mm/a respectively. Each season and annual air temperature had a significant warming phenomenon. Although precipitation had a significant increasing and decreasing phenomena, but its increasing was in 1980s, and the decreasing was in 1990s; meanwhile, the evaporation also had a significant increasing and decreasing phenomena, its decreasing was in 1980s while its increasing was in 1990s. When the climatic tendency and jump are happening, it increase desertization expanding around Qinghai Lake, causes grassland degeneration, river flow decreasing and lake level descent; that is, it has a severe impact on ecological environment.