土地利用变化对艾比湖流域生态系统服务价值的影响

基于遥感与GIS技术,运用生态系统服务价值系数分析了1970-2009年艾比湖流域生态系统服务价值的变化,探讨了干旱区典型内陆湖流域生态系统服务变化对土地利用/覆被变化(LUCC)的响应.结果表明,近40 a艾比湖流域土地利用状况变化显著,耕地和建设用地的面积增加,其他土地利用类型的面积减少；流域生态系统服务价值整体变化较小,总价值先增后减,林地、水域和草地面积的减少是总服务价值减少的主要原因,耕地面积的增加补偿了总价值的部分损失,但损失略大于收益；各项生态功能的服务价值对总生态系统服务价值贡献大小的等级基本稳定,其中,水源涵养、土壤形成保护和废物处理能力的贡献率最大；敏感性分析表明,研究区生态系统服务价值对于生态价值系数是缺乏弹性的,各土地利用类型生态系统服务价值敏感性指数都小于1,研究结果是可信的.

Impacts of Land Use Change on Ecosystem Services Value in the Ebinur Lake Basin

By using RS and GIS technologies,the changes of ecosystem services value in Ebinur Lake basinfrom 1970to 2009were analyzed,and the responses of ecosystem services value change to land use/coverchange(LUCC)in typical arid inland lake basin were discussed based on the theory of ecosystem servicesvalue coefficient.Results showed that the land use change was significant in the basin from 1970to 2009.The areas of cultivation land and construction land increased,but the areas of other land uses decreased.Theecosystem services value in the basin changed slightly in the period and the total ecosystem services valuedecreased after an initial increase,because the areas of woodland,water body and grassland decreased.Theincrease of cultivation land area partially offset the loss of the total value,but the loss was still greater thanthe gain.The contribution of each ecosystem service value to the total ecosystem services value had a lesschange,and the service value from water conservation,soil formation and protection together with wastetreatment contributed most.Sensitivity analysis indicated that the estimated total ecosystem services value inthe study area was inelastic to the services value coefficient,the sensitivity index of ecosystem services valuefor each land use type was less than 1and therefore,the results are credible.