中国三大城市群收缩城市“三生”功能耦合协调度分析

Analysis on coupling coordination degree of production-living-ecological functions in shrinking cities of China’s three major urban agglomerations

以人口密度作为量化标准,识别2012—2017年京津冀、长三角、珠三角三大城市群137个县级以上城市的收缩情况,构建多维度指标体系对收缩城市“三生”功能及耦合协调度时空格局演变特征进行分析,并运用多元回归模型探究其影响因素。研究表明:2012—2017年,三大城市群共40个收缩城市,占城市总量的29.20%,以轻度收缩为主,主要包括资源型城市、核心城市周边中小城市和偏远欠发达城市三种类型。研究期间,三大城市群收缩城市“三生”功能时空格局变化差异显著,京津冀收缩城市综合功能下降趋势最为明显。三大城市群收缩城市“三生”功能耦合协调度水平整体偏低,其中京津冀城市群明显高于长三角和珠三角城市群,地域差异显著。研究表明:不同城市群收缩城市耦合协调度影响因素与功能变化显著指标较为相关,三大城市群城市收缩情况与“三生”功能耦合协调度变化趋势联系密切。

This article uses population density as a quantitative standard to identify the shrinkage of 137 cities at or above the county level in the three major urban agglomerations of BeijingTianjin-Hebei, Yangtze River Delta, and Pearl River Delta in 2012-2017, and construct a multidimensional index system to evaluate the shrinking cities The spatial and temporal differences of the production-living-ecological function are analyzed, and the spatial and temporal pattern evolution characteristics of the coordination degree of the shrinking. The research shows that:(1) In 2012-2017, there were 40 shrinking cities in the three major urban agglomerations, accounting for 29. 20% of the total number of cities, mainly with slight shrinkage, concentrated in the Yangtze River Delta urban agglomeration, mainly including resource-based cities, small and mediumsized cities around core cities and remote underdeveloped cities.(2) During the study period, the spatial and temporal patterns of the production-living-ecological function of the shrinking cities of the three major urban agglomerations were significantly different. The comprehensive function of the 21 shrinking cities declined, and the production-living-ecological function of the shrinking cities of the Beijing-Tianjin-Hebei urban agglomeration declined most obviously.(3)The coordination level of the production-living-ecological functional coupling in the shrinking cities of the three major urban agglomerations is generally low, and they are all in low-level coupling and transitional stages. Among them, the coupling coordination degree of the shrinking cities of Beijing-Tianjin-Hebei is significantly higher than that of the Yangtze River Delta and the Pearl River Delta. Urban agglomerations have obvious regional differences;the coupling coordination degree of shrinking cities in the Yangtze River Delta is relatively stable. The shrinking situation of the three major urban agglomerations is closely related to the change trend of the production-living-ecological function and coupling coordination degree. The research results can formulate differentiated production-living-ecological function promotion strategies for the shrinking cities of the three major urban agglomerations, and promote the production-living-ecological function of urban agglomerations.