| MODIS NDVI data and dimidiate pixel model were used to analysis the variation degree and trend of FVC of main land use types and cultivated land with different slopes in both the project zones and the perimeter zones. The results showed: (1) The FVC in the project zones of returning cropland to woodland increased significant with a higher rate than that in the perimeter zones. (2) The ar
ea with an increase rate of FVC being higher than 10% occupied for 79.8% of the project zones, while the area with a decrease gradient being higher than 10% occupied for less than 1%. (3) The area with a significant increased FVC occupied for 70.6% of the project zones, while the area with a significant decreased FVC only occupied for 0.1%. The FVC of unused land, grassland, forestland and most of cultivated land showed a significant increase trend, while that of construction land for industries, mines and residents in urban and rural regions, and a small part of cultivated land showed a significant or extremely significant decrease trend. (4) The FVC of sloping farmland was improved significantly, and it contributed with a high proportion to the vegetation improvement of whole farmland. Under the circumstance of warming and drying tendency, the FVC in the project zon
es of returning cropland to woodland showed a significant increase trend, with a higher rate that in the perimeter zones. The FVC of sloping farmland, forestland and grassland increased more than that of other land use types. This could come to a conclusion that the policy of returning cropland to woodland produced a good effect of vegetation restoration. |