Abstract: In order to further improve the ecological civilization construction level of Liangqing District, Nanning City, and accurately assess the spatiotemporal evolution characteristics of eco-environmental quality in the area under the background of rapid urbanization, this study used Landsat remote sensing images from 2015, 2020, and 2026 as data sources, integrated four ecological indicators, i.e., greenness (NDVI), wetness (WET), dryness (NDBSI), and heat (LST), based on the Remote Sensing Ecological Index (RSEI) model, allocated weights using principal component analysis, and conducted a comprehensive evaluation of the eco-environmental quality of the area over the past 10 years. The results showed that, in the temporal dimension, the mean RSEI of Liangqing District increased from 0.58 in 2015 to 0.65 in 2020, then decreased to 0.50 in 2026, showing a trend of first increasing and then decreasing, and the change rate of eco-environmental quality was -0.007 per year. In 2026, areas with poor eco-environmental quality in the northern part of Liangqing District continued to expand southward under the influence of urban construction, while areas with good or better quality in the central and southern parts were relatively concentrated, the area of poor-quality regions decreased, and local ecology improved to some extent. From 2015 to 2026, the areas where eco-environmental quality significantly improved were mainly concentrated in the central part, with scattered distribution in the northern and southern parts, while the areas where it significantly deteriorated were mainly distributed in the region south of the northern urban agglomeration and some parts of the south.

Key words: multi-temporal, remote sensing ecological index, eco-environmental quality, Landsat remote sensing images, Liangqing District, Nanning City