[Ecological Quality Assessment of Chengdu's Main Urban Area Based on Remote Sensing Ecological Index and Its Response...

This study investigated the spatiotemporal evolution of ecological quality and its response mechanism to urban functional zoning in Chengdu's main urban area， aiming to provide a scientific basis for ecological space optimization. Based on Landsat remote sensing images from 1992 to 2023， the remote sensing ecological index （RSEI） was constructed. Spatial autocorrelation analysis and Moran's I index were employed to reveal the spatial differentiation characteristics of ecological quality. Urban functional zones were identified using POI data and the TF-IDF method. Pearson correlation and standardized regression models were used to analyze the driving paths of functional zone weights on RSEI. The results indicate： ① The mean RSEI values for the four periods （1992-2023） were 0.732 3， 0.642 2， 0.554 6， and 0.636 2， respectively， exhibiting a "V-shaped" variation trajectory with an initial decrease followed by an increase. ② The spatio-temporal distribution of ecological quality in the study area successively underwent an evolution trend of "central improvement with peripheral deterioration" followed by "overall improvement." ③ The clustering degree of RSEI initially increased and then decreased. High-high cluster areas consistently remained in the urban periphery， while low-low clusters dominated the central region. The centroid of high-high clusters shifted westward to eastward， the extent of low-low clusters continuously expanded， and post-2013 witnessed gradual fragmentation of low-low clusters. ④ High-intensity development functional zones significantly inhibited ecological quality. Commercial zones showed significant correlation with RSEI， industrial zones exerted the greatest negative impact， and green space zones exhibited a significant positive correlation but low eco-efficiency conversion. The negative ecological effects of public service and cultural-educational zones were controllable. The RSEI in Chengdu displayed a "V-shaped" evolutionary trend， significantly driven by functional zoning heterogeneity. Enhancing urban ecological resilience requires regulating commercial development intensity， strengthening industrial ecological isolation corridors， and embedding green space networks.