基于土地利用变化的三峡库区生态服务价值损益分析———以重庆市巫山县为例

在分析巫山县1996到2005年土地利用变化的基础上,采用Costanza等的生态系统服务价值模型和谢高地等的中国陆地生态系统生态服务价值表,测算了巫山县生态服务价值变化和生态敏感指数.研究结果表明,巫山县全县生态服务价值增加了42 515.83万元,年均增长4 723.98万元;全县土地利用变化主要影响因素是三峡工程和生态环境建设,林地和园地大量增加是生态退耕和农业结构调整的结果,其中林地对生态系统服务价值增加量最大;各种土地利用类型生态系统敏感性指数均小于1,表明生态服务价值对价值系数的变化缺乏弹性.

Analysis of the Gains and Losses of the Ecosystem Service Function Values of Three Gorges Reservoir Region Based on Land Use Change——A Case Study of Wushan County in Chongqing

Based on an analysis of land use change in Wushan county of Chongqing from 1996 to 2005,the change in the value of ecosystem services and sensitivity index of the county during this period was calculated,adopting Costanza’s ecosystem service value theory in combination with Xie Gao-di’s table listing the ESV of per unit area in China.The results showed that the ecosystem services value in the study area increased by 42 515.83×104 Yuan,or 4 723.98×104 Yuan per year.The dominant factors,which caused the land use changes,were the Three Gorges Project and ecological environment construction.The increase in the acreage of foresdand and garden land resulted mainly from the implementation of returning cultivated land to forestland and the re-adjustment of agricultural structure.The ecosystem service of forestland made the greatest contribution to the increase in total ESV of this county.The sensitivity index of the ecosystems of various land use types was less than 1,indicating a lack of flexibility in the coefficients of sensitivity(CS) of ecosystem service value.