关键词: 区域环境质量评价;生态质量指数;土地利用;白鹤滩水电站;

Abstract: Ecological environment quality is one of the core contents of regional ecological construction.For the trade-off and synergy between the temporal and spatial dynamics of ecological environment quality and land use/cover，taking the Baihetan Hydropower Station area as the research area，based on the five images of the sentinel 2 remote sensing during 2017 to 2021，four factors are selected including biological richness index，vegetation coverage index，normalized differential soil index and normalized difference moisture index，in which the ecological quality index is used to evaluate the ecological environment quality from 2017 to 2021.The results show that：① During these five years，the ecological environment quality in the study area has shown an upward trend.The ecological quality has shown scattered deterioration in small areas but the totality showed an increasing trend.② The ecological quality grades are distributed in patches，with general grades as dominant，the ecological quality grades mostly shift from general to good grades.③ There is a highly synergistic relationship between the spatial layout of land use types in the study area and the level of ecological quality，which is manifested that the areas with high habitat quality concentrate basically in forest land and water areas，while the quality of the local habitat is poor where human activities are more intensive.

Key words: regional environmental quality assessment；ecological quality index；land use；Baihetan Hydropower Station