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Dynamics of ecosystem services value in Aksu River watershed in 1960-2008.

1960—2008年阿克苏河流域生态系统服务价值动态


基于遥感与GIS技术,运用中国陆地生态系统服务价值当量表,结合当地粮食产量与粮食平均收购价格,分析了1960—2008年阿克苏河流域生态系统服务价值的变化,探讨了干旱区跨境河流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:研究期间,阿克苏河流域生态系统服务价值整体变化较小,总价值先减后增,沼泽、林地、草地面积的减少是总服务价值减少的主要原因,耕地和水域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,土壤形成与保护和废物处理功能的贡献率最大;研究区生态系统服务价值大小及变化的空间差异较大,以流域下游的变化最频繁.敏感性分析表明,研究区内生态系统服务价值对服务价值指数缺乏弹性,研究结果具有稳健性.

By using GIS-RS techniques and the table ‘Equivalent weight of China terrestrial ecosystems services value’, in combining with the local grain yield and grain purchasing price, this paper analyzed the changes of  osystem services value in Aksu River watershed in 1960-2008, and explored the responses of ecosystem services value change in arid trans-boundary river watershed to land use/cover change. Overall, the ecosystem services value in Aksu River watershed in 1960-2008 changed slightly, with the total value increased after an initial decrease. The main cause of the initial decrease was the area decrease of wetland, woodland, and grassland. The area increase of cropland and water body partly offset the loss of the total value, but the loss was still larger than the gain. The contribution of each ecosystem service value to the total ecosystem services value had less change, and the service value from soil formation and protection together with waste treatment contributed most. There was a significant spatial heterogeneity in the magnitude and the variation of cosystem services value, with the downstream of the watershed changed significantly. Sensitivity analysis indicated that the estimated total ecosystem services value in the study area was inelastic to the services value coefficients, and the results shown in this paper were robust.