【摘要】 在传统的草原生态系统价值估算的基础上,利用遥感技术,以谢高地等人计算出来的各种草地类型单位面积价值量为经济参数,利用2003年MODIS数据估算的中国草原生态系统服务价值约折合US$311.48×108,并从草地类型和省区等角度分别进行区域分析,表明我国草原生态系统服务价值呈现出农牧交错带较高且逐渐向牧区递减的特征,说明牧区草原生态系统退化比较严重,草原生态功能保护意识需要进一步加强。更多还原

【Abstract】 As a natural resource,grassland ecosystem has many services valuation,including both direct and indirect ones. It is very urgent to construct a valuation system to correct the ideology of ignoring the indirect functions of grassland ecosystem for sustainable development of the natural resource.A methodology using MODIS remote sensing data to valuate the services of Chinese grassland ecosystem was developed,which can be used as part of Chinese National Green Accounting System.A new model was proposed for valuation of grassland ecosystem services.The model was improved from the conventional method for the valuation.The economic parameter was based on unit area value of every grassland type which was got by Xie Gao-di et al.However,its parameterization is not from ground scouting but retrieved from MODIS data hence featured with spatiality,which is required for the valuation.Applying the model to MODIS data of the year 2003,the total services of Chinese grassland ecosystem can be valued as 311.48×10~8 US,which is slightly less than the value estimated using conventional method.The preliminary examination indicated that this value is more reliable than the one from conventional estimation because it is based on spatial statistics while the conventional one is on limited ground scouting.Spatial variation of the service value is very obvious,which can be interpreted as the direct result of different conservation policies in various grassland regions.Spatial distribution of the value showed a feature of gradually decreasing from cropping-grazing mixture belt into grazing regions,which indicated that grassland ecosystem is degradated heavily.更多还原