关键词: 城市群, 收缩城市, “三生”功能, 耦合协调度, 影响因素

Abstract:

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 Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta in 2012-2017, and construct a multi-dimensional 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 medium-sized 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.③The 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.

Key words: urban agglomeration, shrinking cities, production-living-ecological function, coupling coordination degree, influencing factor