基于分形理论的徐州城市空间结构演变研究

基于迭代原理的城市形态分形研究方法，运用分形维数（相关维数、半径维数、膨胀维数）和标度曲线，定量分析了徐州城市空间结构演变规律。结果表明：分形维数可以定量揭示城市用地的空间分布和空间组织结构，标度曲线可以定量揭示不同空间尺度下各类用地的标度行为，二者相互结合可以更好地测度城市空间结构演变的规律；徐州城市居住用地、工业用地、交通用地空间分布的均质程度在逐渐增强，但公共设施用地空间分布的均质性较差；随着城市的扩张，居住用地和工业用地表现出显著的外迁趋势，市中心区的商服功能则进一步加强，城市由市中心向外围逐渐形成明显的“公共设施用地 居住用地 工业用地”布局的圈层结构，并在城市外围形成新的商服中心；与居住用地和公共设施用地相比，工业用地边界形态复杂，稳定性较差。

STUDY OF URBAN SPATIAL STRUCTURE EVOLUTION BASED ONFRACTAL THEORY IN XUZHOU

With the help of fractal methods of urban morphology based on iterative principles as well as fractal dimensions including correlation dimension，radius dimension and dilation dimension，this paper quantitatively analyzed the evolutional pattern of urban spatial structure of Xuzhou.Firstly,the study showed fractal dimensions could be used to reveal the spatial distribution and organizational structure quantitatively,while scaling behavior curve revealed the scale behavior of urban land use under different scales,and the application of the both could reveal the evolution law of urban spatial structure better.Secondly,the spatial distribution homogeneity of residential land,industrial land,and transportation land had been increasing while that of infrastructural land was poor.Thirdly,with the expansion of the city,an obvious ring structure of infrastructural land,residential land,industrial land from the center to periphery came into being and new commercial centers had been formed in periphery of city．Finally,compared with residential land and infrastructural land，the boundary of industrial land was complex and of poor stability.