Spatiotemporal changes and comprehensive ecological effects of impervious surface in Nanchang City
The impervious surface destroys the regional ecological environment.The research on the correlation between impervious surface and comprehensive ecological effects is of great significance to the optimization of the spatial pattern of land.The impervious surface cover in 2000,2010,and 2020 was obtained from the linear spectral mixture decomposition model.The spatiotemporal changes characteristics of impervious surface in Nanchang City were analyzed.Indicators such as surface temperature,surface runoff,water network density,habitat quality,NDVI,and carbon emissions were selected to construct a comprehensive ecological effect evaluation system.Geographically weighted regression model was used to explore the spatial correlation between impervious surface changes and the comprehensive ecological effect index in the study area.The results showed that:1)From 2000 to 2020,the proportion of impervious surface in the total land area of Nanchang City increased from 5.80%to 13.59%,and the overall distribution decreased from the central urban area to the outside,forming a multi-level distribution pattern with the central urban area as the main body,Anyi County and Xinjian District as multiple sub cores.2)From 2000 to 2020,the concentration of spatial distribution in all districts and counties of Nanchang City was increased,and the impervious surface maintained a rapid growth trend.The central urban area was the area with the most intense transformation from natural surface to artificial surface.3)From 2000 to 2020,the negative regression impact of impervious surface coverage and comprehensive ecological effect index in Nanchang City first increased and then weakened,from-0.1304 to-0.3745,and then to-0.1099.While the impervious surface deteriorated the regional ecological environment,Nanchang City was actively solving problems such as serious environmental pollution and reduced ecological quality.Nanchang City strives to reasonably protect the ecological environment at the pace of economic development.Nanchang City is moving towards regional sustainable and high-quality development.
impervious surfacespatiotemporal changescomprehensive ecological effectgeographically weighted regression modelNanchang City
万方数据
维普
