长江经济带三大城市群经济差异演变及影响因素——基于多源灯光数据的比较研究

Abstract

Based on the DMSP-OLS and NPP-VIIRS nighttime light data, this study develops a time series of total nighttime light (TNL) from 1995 to 2015 and multidimensionally analyzes the spatial-temporal evolution and influencing factors of economic disparities among three urban agglomerations in the Yangtze River Economic Belt applying the method of Dagum Gini coefficient, standard deviational ellipse, gravity-center model and geographical detector model. Results indicate that: 1) TNL of three urban agglomerations appears a gradient descent from east to west, while the growth rate of TNL presents a gradient decline from west to east. Overall disparity among the three urban agglomerations is downgrade year by year, as well as discrepancies between and within urban agglomerations. Differentia between urban agglomerations is mainspring of the overall disparity. 2) Path dependence phenomenon exists in the spatial structure evolution of each urban agglomeration, which is constantly strengthened on the basis of the early stage. 3) Government investment, market situation and openness are the core factors influencing economic differentiation of the three urban agglomerations. The effects of population scale, medical level, educational level and traffic level differ with the changes of regions and development stages of urban agglomerations. Results can provide a scientific basis for the optimization of economic spatial distribution in each urban agglomeration and promoting the coordinated development of the three urban agglomerations.