陕南城镇体系结构的分形研究

Study of the urban system in southern Shaanxi based on the fractal theory

对陕南城镇体系的分形研究发现:等级规模结构的分形特征不太典型,区域中心城市作用不强;在空间结构方面,聚集维数显示空间集聚分形特征明显,区域性中心城市外围形成由中心向四周密度递减的城镇体系,具备成为区域增长极的条件;关联维数显示城镇体系内交通网络通达性较好,各城镇之间具备开展经济协作的基础设施条件。基于上述结论,应大力加强区域性中心城市建设,增强辐射带动能力,同时各城镇之间应开展经济合作,进一步促进经济活动的空间集聚。

Based on the fractal theory, a thorough analysis of the size distribution and spatial structure of urban system in southern Shaanxi is made. Conclusions have been drawn by caculating dimensions of urban system ： the level of the scale of the fractal structure is not typical, showing the role of regional centers is not strong ; As for space structure, aggregation dimension estimates show that the accumulation of fractal space sig- nificantly, the formation of regional centers outside the city have been decreasing from the center to the sur- rounding density of the urban system, three regional cities with a regional growth pole conditions and correlation dimension estimates are that within the urban system transport network accessibility is better, with towns to de- velop economic cooperation between the basic infrastructure conditions. According to these conclusions, the re- gional central cities should be strengthened, and their capacity to promote radiation should be enhanced, and connections between towns should make full use of existing resource conditions and traffic conditions, economic cooperation, further promote the spatial concentration of economic activity.