Spatio-temporal Coupling Coordination Relationship Between Ecological Environment and Urbanization in Changsha-Zhuzhou-Xiangtan Urban Agglomeration,China——Based on Remote Sensing Ecological Index and Nighttime Lighting Index
Urbanization is an important factor in promoting socio-economic development and influencing regional ecological security patterns,and the stable coordination of the ecological environment and urbanization is a guarantee of achieving sustainable regional development.In order to balance the coupling coordinated relationship between urbanization and ecological environment in the urbanization development process of urban agglomerations,the 23 counties of Changsha-Zhuzhou-Xiangtan urban agglomeration were taken as the research object,the land use,nighttime lighting and MODIS data were comprehensively collected;based on Google Earth Engine(GEE)platform,the nighttime lighting index and remote sensing ecological index were constructed to characterize the level of urbanization and ecological environment quality respectively from 2002 to 2022,and the coupling coordination degree model was used to analyze the hierarchical clustering and spatial-temporal differences of the coupling coordination between urbanization and ecological environment in Changsha-Zhuzhou-Xiangtan urban agglomeration.The results show that ① from 2002 to 2022,the Changsha-Zhuzhou-Xiangtan urban agglomeration experiences a significant change in heat,decreasing by 29.26％;and the ecological quality of counties,except for Yanling county,decrease to different degrees,showing an inverted N-type or M-type trend,with the greatest decrease in remote sensing ecological indexes in Kaifu district,Tianxin district,Tianyuan district and other counties,where there are many urban construction activities;② the urbanization level of Changsha-Zhuzhou-Xiangtan urban agglomeration increases,and the nighttime lighting index is on the rise overall,but the growth rate in 2022 is lower than that in 2017,the development between counties is uneven,and the counties with higher levels concentrate in Changsha;③most counties in Changsha-Zhuzhou-Xiangtan urban agglomeration are in the stage of transition from antagonism to friction from 2002 to 2022,and the overall coupling degree is at a high level in 2012,but 17 counties fall back to a lower stage in 2017.In 2022,most counties in Changsha-Zhuzhou-Xiangtan urban agglomeration have reached a state of harmonization in terms of the coupling degree of coordination,and some counties are out of harmony for a long period,and the overall coupling and coordination situation are better,but the spatial distribution is unbalanced,with the characteristics of high in the north-central part and low in the south.
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