Spatio-temporal Change of Land Use and Land Cover in Chao River Basin Based on GIS

Spatio-temporal change of land use and land cover from 1985 to 2005 in Chao River Basin, the important water source to Miyun Reservoir, was analyzed based on GIS technology. The results showed that woodland was the main land cover type in the basin, and then the arable land and grassland. During 1985-2005, the area of woodland increased, while the area of grassland greatly reduced. Changes of land use and land cover were more violent from 1985 to 1995 than that from 1995 to 2005. There were obvious regional differences in land use change in the basin. The conversion from grassland to woodland was the dominant process of LUCC in the basin, and this was relevant to the national ecological construction policies on water resources conservation.