RESEARCH ON ECOLOGICAL SERVICES MEASUREMENT AND SPACE - TIME EVOLUTION OF THE UPPER REACHES OF YANGZTE RIVER BASIN, CHINA

摘要

With data collected from remote sensing (RS) taken by Landsat TM5/TM8, the hydrological report of the upper reaches of Yangtze River Basin and the local statistical yearbook, 4 periods of vegetation coverage change was analysed. The spatial heterogeneity in functions of ecological services was estimated by differences in the conditions of natural factors and social functions. The results show: (1) The land use change type is mainly forest land, accounting for 53.15% of the total area of the study area; the area of cultivated land and other land decreased by 29 800 and 4 780 km(2), respectively; (2) The ecological service value of the study area during these four periods are RMB 9.80 billion, RMB 10.25 billion, 10.61 billion, and RMB 11.04 billion, respectively, while the ecological service value of the six tributaries are increasing; (3) Based on the GM (1, 1), the expected ecological service value of the study area are RMB 11.49 billion in 2016, RMB 11.96 billion in 2020, RMB 12.46 billion in 2025 and RMB 12.97 billion in 2030. In addition, ecological service values are on the rise, and the relative error is 4.79%. The results can better assist decision making regarding ecological compensation.