基于土地覆被变化的北京市生态环境质量时空分异特征及影响因.

[Objective]The aim of this study is to evaluate the ecological environment status of a region, which is of great practical significance for promoting urban construction and economic development, achieving ecological environment protection and sustainable economic and social development in Beijing. [Methods]The remote sensing ecological index(RSEI)coupled with the characteristics of regional greenness, humidity, dryness, and heat was used to explore the temporal and spatial dynamics of eco-environmental quality in Beijing from 1990 to 2020. Sen trend analysis, Manna-Kendall mutation point test, Hurst method, multiple regression, and structural equation model were employed to explore the impact of different environmental factors on the ecological environment quality of Beijing. [Results](1)From 1991 to 2020, the overall ecological environment quality in Beijing showed a decreasing trend. Among them, the ecological environment quality of forest areas showed a trend of 'increasing decreasing increasing', while the ecological environment quality of shrub areas showed a trend of' increasing decreasing increasing decreasing'. The ecological environment quality of grasslands, farmland, wetlands, and impermeable areas showed a trend of 'decreasing increasing decreasing', while the ecological environment quality of wasteland areas had always shown a trend of' decreasing'. (2)The ecological environment quality of impermeable areas was mainly affected by the negative impact of dryness and the positive impact of humidity. Greenness and heat mainly affected them by affecting humidity and dryness. The ecological environment quality of grassland, wasteland, and shrub areas was mainly negatively affected by heat and positively affected by greenness, humidity, and dryness. The ecological environment quality of cultivated land areas was mainly negatively affected by dryness and heat. The ecological environment quality of forest areas was greatly affected by humidity, dryness, heat, and greenness. The ecological environment quality of wetland areas was positively affected by heat, greenness, and humidity, rather than negatively affected by dryness. [Conclusion]The overall direction of policies in maintaining and managing the ecological environment in Beijing is effective. The ecological environment quality in the vast majority of regions is improving, while the ecological environment quality of a few areas has slightly decreased. The targeted policy adjustments should be made to improve the ecological environment quality. However, further standardization of land cover in Beijing and strengthening of natural disaster prevention strategies are still needed in the later stag [ABSTRACT FROM AUTHOR]