Study on the Identification Method of Ecological Source in Fujiang River Basin

Abstract

Qualitative methods (direct identification of forest lands and nature reserves) and quantitative method (identification based on the evaluation of the importance of ecosystem services) were used to identify ecological sources.The results show: (1) The ecological source area identified based on the importance evaluation of ecosystem services is 7638.88 km², accounting for 19.34% of the total area of the Fujiang River Basin, which is mainly distributed in the eastern margin of the Qinghai-Tibet Plateau and the parallel mountains in eastern Sichuan. (2) Ecological sources were identified based on the importance evaluation of ecosystem services, the overlapping area of ecological sources and forest lands reached 87.76 % of the total area of ecological sources, and the overlapping area of ecological sources and nature reserves accounted for 51.61% of the total area of nature reserves. (3) Forest lands have multiple functions such as water conservation, soil and water conservation, and habitat quality maintenance. Therefore, most of the ecological sources extracted by ecosystem service indicators are forest lands. Due to the differences in classification criteria and consideration perspectives, approximately half of the areas in nature reserves are not within the ecological sources identified based on the evaluation of the importance of ecosystem services.