关键词: 沙化土地, 后效评估, 辽西北地区, 多源遥感数据, 生态效益, 社会效益

Abstract: Northwest Liaoning is an important ecological barrier to prevent the Horqin sandy land from invading the North China Plain and the Northeast China Plain. It is of great significance to evaluate the effectiveness of ecological management. To evaluate the effectiveness of desertified land ecological management, weestablish an evaluation model for the effectiveness of desertified land management, whith takes ecological and social benefits into account. Using multi-source remote sensing data and ground survey statistics, a comprehensive model is established to evaluate the effectiveness of desertified land ecological controlin northwestern Liaoning. Based on the cross-validation between remote sensing data and field survey results, the rationality of the key technologies are analyzed. The results show:① By using Landsat and Sentinel-2 data, it is a cross-validation of the singleand comprehensive index of ecological benefit estimated by the model, there is a strong correlation between the results of the same index, and the Pearson coefficient is between 0.61 and 0.84, p<0.01. ②The FVC estimated by the model and the vegetation coverage of the field survey also have a strong consistency, the Pearson coefficient is 0.76, p is 0.016, which shows the rationality of the key technology of the model. ③The model is used to evaluate the effectiveness of desertification land ecological management in ten counties in northwestern Liaoning, the changes are unstable in time and space. In summary, the effectiveness evaluation model established can better integrate the ecological and social benefits of desertification land management, and provide references for other ecological management effectiveness evaluations, but the model parameters need to be adjusted for different regions.

Key words: desertified land, post-effect assessment, northwestern Liaoning, multi-source remote sensing data, ecological benefits, social benefits