天山北坡城市群点-轴结构分形与干旱区绿洲城市群发展特征

Fractal Structure of Point-Axis System and the Development Features of Oasis Urban Agglomeration in Arid Area of Tianshan Mountains North Slope Urban Agglomeration

针对中国西北区域的城市群发展问题,从干旱区绿洲空间碎片化结构特征及其对城镇空间的约束性出发,论证天山北坡城市群点-轴结构"多中心组群"式发展的自然客观性特征。通过构建城镇群点-轴结构位序-规模等级维数、空间关联维数和空间聚集维数表征的分形研究模型,解析了以天山北坡城市群13个建制市为样本的点-轴结构分形特征,推证了天山北坡城市群点-轴结构"多中心组群"式发展的绿洲空间结构特征、发展基础与优势,提出了绿洲区域层级性的城镇组群发展对策与建议。

Based on the structure features of fragmentation in the oasis of arid region and its constraints upon urban space, this paper illustrates and explains the features of the objectivity of nature and the development strategies of the polycentricity agglomeration to the urban agglomeration development of Northwest China with a case study. By means of building fractal-study models, the model of dimensionality features of the point-axis structure and the rank-size rule, the model of spatial association, and the model of spatial cluster for urban agglomeration, this essay takes a urban agglomeration with thirteen urban areas in Northern Slope of Tianshan Mountains as a sample, analyses and examines the fractal features of its point-axis structure, the development basis and strengths of polycentricity agglomeration progression on this structure, and indicate the development strategies and suggestions of the hierarchical development of urban agglomeration in oasis area.