Estimation and Dynamic Variation Analysis of Ecosystem Service Values in Xichuan County
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Abstract:
Xichuan County is located at the headwork of the Middle Route of South-to-North Water Diversion Project, thus its regional economic development and ecological environmental change are affected by the project, and it can also affect the water quality of the project. In this paper, based on the land use/cover maps of year 1995, 2000, 2005, and 2008, the ecosystem service values and their dynamic variation characteristics of Xichuan County were calculated and analyzed for the four years. The results indicated that the highest ecosystem service value of Xichuan County was 3382.51 million RMB in 1995. Due to the effects of human activities, the ecosystem service value of Xichuan County had lost 348.37 million RMB from 1995 to 2008, and the decreasing of cultivated land and water body was the main reason. The ecosystem service values of woodland, cultivated land, and water body accounted for 90% of the total value. The water conservation, waste treatment, and bio-diversity protection were the top three ecological functions and their ecosystem service values accounted for 50% of the total value. The ecosystem service value of Xichuan County lost 736.50 million RMB from 1995 to 2000. With the gradual implementation of the ecological environment construction of the Middle Route of South-to-North Water Diversion Project, the ecosystem service value of Xichuan County began to increase from 2000 and 2008 and reached 3034.13 million RMB in 2008. Moreover, the ratio of ecosystem service value to GDP has decreased since 2000, which indicated the existence of ecological environment protection and economic development in Xichuan County.
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