The effect evaluation of the program of restoring grazing to grasslands in Maqu County
玛曲县草地退牧还草工程效果评价

The effect of restoring grazing to grasslands areas in Maqu County was evaluated in this paper. The 16 days 250m MODIS, annual NDVI and month NDVI data and synchronous meteorological data were used to build some regression models. Using these models we can forecast and evaluate the effect if without the project. Moreover we can use the models to analyze the residual difference change trend of actual NDVI and simulative NDVI from 2000 to 2006, and then to deduce the different project types effect on the grasslands restoring. The result showed that restoring grazing to grasslands was benefit for grassland growing and restoring, especially in the earlier and latter growing seasons. Forbidden grazing measure was the most effective. For the grassland restoring condition, all the grassland areas were in the recovering process, but the effects were various in different areas, and the best condition in Manrima village, the worst in Oula village. As a whole, the project was executed well in most enclosures and the restoring conditions were well, among these enclosures, the 16th enclosure was the best condition. However, some enclosures conditions were bad, such as the 5st enclosure, which can be concluded that there were some absurd grazing behaviors and the project was not well executed in those areas.