本研究拟采用遥感、GIS、野外实验和风洞实验相结合的研究手段，在区域尺度上评估1992-2014年锡林郭勒典型草原退化过程对区域防风固沙量的影响。通过耦合小波分析和变化向量分析法，监测区域1992-2014年草原退化的区域、类型和强度；基于野外实验和室内风洞实验，率定风蚀输沙率模型参数，建立并筛选输沙率半经验模型，在区域尺度上应用该模型，模拟不同时间尺度的防风固沙量的空间格局。最后，采用奇异值分解方法，诊断典型草原退化过程与防风固沙量动态之间的关系，识别防风固沙生态系统服务变化对草原退化敏感的热点区域。本研究将在区域尺度上定量揭示草原退化过程对防风固沙生态系统服务影响的空间特征和规律，成果有助于增进典型草原退化过程及其对防风固沙服务影响方面的理解，为区域生态系统服务优化、草原生态系统可持续性维持、退化生态系统的恢复重建提供科学依据。

In this study, the impacts of steppe degradation on the sand fixing service of Xilingol steppe during 1992-2014 were assessed by integrating the remote sensing (RS), Geographic Information Systems (GIS) and the field and wind tunnel experiments. Firstly, the wavelet analysis and change vector analysis were coupled to effectively and accurately detect the type and intensity of steppe degradation from 1992 to 2014. Then, a semi-empirical model of the sand transport flux was established in which the parameters were calibrated based on the field and wind tunnel experiments. The model was applied at the regional scale with the use of GIS spatial analysis techniques and taking the RS data and meteorological interpolation data as input. The spatial patterns of sand-fixing amount at different time scales were simulated. Finally, the relationship between steppe degradation process and sand-fixing amounts dynamic was analyzed by the Singular Value Decomposition method. The hotspots where sand-fixing services are sensitive to steppe degradation were identified. The results are benifical to optimize the regional ecosystem services, and provide the scientific basis for restoration of degraded ecosystems and maintaining the sustainability of grassland ecosystems.