20世纪90年代以来京津冀城市群规模结构的时空演变分析

Space-Time Evolution Analysis of City Scale and Structure in Beijing-Tianjin-Hebei Urban Agglomeration since the 1990s

运用首位度指数、位序—规模法则及分形等理论对20世纪90年代以来京津冀城市群不同规模城市的数量变动和空间结构演变进行了分析,找出了目前该城市群规模结构存在的问题:(1)城市群中北京和天津两市的人口过于集中,而其他等级城市的人口规模偏小,导致该区域人口规模的结构呈现"倒金字塔"型;(2)在区域发展过程中,大城市发展速度过快,而小城市过慢,以至小城市的作用无法凸显;(3)该区域的城镇结构体系不够合理,各城市的功能不够协同.提出相应的对策建议.

The number change and spatial structure evolution of different size cities in Beijing-Tianjin-Hebei urban agglomeration since the 1990 s was analyzed using the first index,a sequence-size rule and fractal theory.The current problems in the urban agglomeration scale and structure were found as follows：（1） In the urban agglomeration,the population in Beijing and Tianjin is too concentrated,and the population size in other cities is in smaller level,which leads to appear ＂inverted pyramid＂type for the area＇s population size;（2） In the process of regional development,large cities development are too fast,but small cities development are too slow,and their roles do not highlight;（3） Urban structure system in the area is not reasonable,and the function of each city lacks of coordination.The corresponding countermeasures were put forward.