The third level aquatic ecological function regionalization and ecological function assessment in typical watersheds of northern Liaoning province

Aquatic ecological regionalization of watershed is an important foundation for integrated management of water ecology and water resource protection. According to investigation results of natural environment,hydrological data and GIS data in the typical Liaohe river watershed of northern Liaoning province,division indexes of the third level were determined by results of the first and second levels,and the third ecological regionalization was obtained in Qinghe and Fanhe river basins. The results indicate that it can be divided into seven and four aquatic ecological regionalizations of the third level in Qinghe and in Fanhe river basins. Ecological service function can be divided into five categories,namely,maintaince of biodiversity and habitat safety,product supply and agricultural production,water conservation and regulation,human settlements protection and urban development,soil conservation and ecological restoration. The results of third level aquatic ecological regionalization could provide scientific references for comprehensive prevention of water pollution and the integrated management of aquatic ecological regionalization.