重庆市土地利用变化对生态系统服务价值的影响

本文以详细的土地利用统计资料为数据源,分析了重庆市1997~2007年的土地利用变化情况,根据谢高地的生态服务价值系数对研究区土地利用变化引起的生态系统服务价值变化进行评估,并进行了敏感性指数(CS)分析。结果表明:研究区在1997~2007年间,耕地、牧草地、湿地和未利用地均减少,林地、水域和建设用地均增加;重庆市2007年的生态系统服务价值比1997年增加了58.95×108元,达到1002.25×108元,这主要是生态价值系数较高的林地面积增加所至;在生态系统单项服务功能变化中,只有食物生产有所减少,其余均有所增加;敏感性系数分析表明,ESV对生态价值系数(Value Coefficient,VC)缺乏弹性,研究结果可信。

Effects of land use variations on ecosystem services value in Chongqing city

Changes of land use quantities and structures in Chongqing city during the years from 1997 to 2007 were analyzed.Ecosystem service coefficients of different land use types in the study area were estimated and the ecosystem services sensitivity analysis was conducted to determine whether these coefficients can be used in the study area or not.The following results and conclusions could be obtained: From 1997 to 2007,the area of cultivated land,grassland,wetland and unutilized land decreased,while woodland,water area and build-upland increased; The total value of ecosystem services in Chongqing city in 2007 increased by 58.95×108 Yuan higher than that in 1997 for the increase of forest land area and its high ecosystem services coefficients; The contribution of various ecosystem functions to the overall value of the ecosystem services comes from the decrease in food production,while the rest had an increase effect.The sensitivity analysis suggested that these estimates were relatively robust.