Study On Ecological Water Use In Yanchi County Of Ningxia

Based on the basic ecological theories, research the definition of ecological water use and established the classification system of ecological water use according to the basic constitute of ecosystem. Classified the ecological water use into current ecological water use and future ecological water requirement, and further calssified the ecological water use into ecological water use of plant, ecological water use of animal and ecological water use of inorganic entironment.Based on this and according to the practical congdition of Yanchi County, further classified local ecological water use types. We can get the Yanchi County's ecological water use types and their ecological water use amount. The calculating results are the following: the ecological water use of forest cover is 6.05×10~8m~3/a; the ecological water use of soil and water conservation is 0.19×10~8m~3/a; the ecological water use of meadow cultivating is 8.18×10~8m~3/a; the ecological water use of lake and billabong is 0.0627×10~8 m~3/a; the ecological water use of plantation in town is 0.0031×10~8 m~3/a. Estabished the classification system of ecological zone. First-grade ecological zone is classified as regional physical geography, second-grade ecological zone is classified as county landuse.Through analyzing feature of ecological water use, we research the proportion relationship between ecological water use amount and rainfall amount. We named it ecological water use coefficient. And we named ecological water use modulus, which is the ecological water use amount in a square kilometer per year. The ecological water use coefficient of Yanchi county is 54.29%, and ecological water use modulus is 16.73. Through analyzing rainfall balance, we research the contrasted relationship between ecological water use and water resource. Through analyzing water resource balance, we research the contrasted relationship between ecological water use and country economy's water use.The ecological water requirement of Yanchi county in 2010 are 16.93×10~8m~3/a calculated by the ecological environment construction plan of Yanchi county. In it, the ecological water use of forest cover is 7.19×10~8m~3; the ecological water use of soil and water conservation is 0.33×10~8m~3; ecological water use of meadow cultivating is 9.34×10~8m~3. And other two kinds of ecological water use change little.