摘要：The eco-environment in Miyun Reservoir in Beijing city has received more attention as the main surface source of the drinking water natural ecological zone for the capital of China. Meanwhile, the changes in land use and land cover (LULC) are a major cause of eco-environmental changes and represent an important part of the global change affecting the environmental quality. Therefore, in this paper, taking the Miyun county as the evaluation unit, supported by RS (remote sensing) and GIS (geographical information system), the spatio-temporal changes of land use from 2003 to 2013 were analyzed with the Landsat TM (OLI) images, and then several synthetic evaluation indices were set up including, natural condition, environmental pollution, geologic hazard and local social economy factors. Combining AHP methods with GIS, the regional environmental evaluation model was established and ecoenvironmental quality was evaluated. The results showed that the areas of cropland, forestland and water body increased, with the annual change rate of 3.2%, 2.27% and 0.89% respectively. While the annual change rate of grassland, unused land, and built-up land decreased by (-) 5.35%, (-) 3.96% and (-) 1.04%, respectively. In 2003, the medium level area occupied the most, followed by the light level area, which was 899.90 and 823.73km2, respectively. However, in 2013, light level dominated the position of the study region, the potential level occupied the subordinate position, with the area ratio of 48.57% and 28.59%, respectively. The sum area of potential and the light level area increased from 46.64% in 2003 to 76.52% in 2013, which indicated that the study region maintained a better grade of the eco-environmental quality. During the past decade, the regional eco-environmental quality has been transferred from worse status to better status, especially in hilly region, due to the implementation of eco-environmental protection measures, such as the Grain for Green and Natural Forest Protection since 1998.
