鄱阳湖生态经济区城市体系空间结构分形特征分析

为探讨鄱阳湖生态经济区城市体系空间结构特征，利用分形模型，分别测算了鄱阳湖生态经济区城市体系的集聚维、网格维和关联维。研究表明：(1）南昌市和九江市在鄱阳湖生态经济区城市体系自组织演化过程中核心作用明显（集聚维数分别为1.042 5和1.151 6），前人认为该区域城市体系具有双核结构特征，集聚维数的测算从城市自组织演化角度印证了该论点；(2）研究区城市体系在空间上以线（如公路、铁路）为轴线展布（容量维（1.035 6）、信息维（107）、关联维D→1），区域内各主要城市之间通达性良好（牛鸦维数比Q=0.941 6）；(3）区域内城市体系系统演化动力比较单一（D1≈D0），自组织演化过程中明显受到鄱阳湖平原水陆生态系统的驱动

ANALYSIS ON FRACTAL CHARACTERS OF SPATIAL STRUCTURE OF URBAN SYSTEM IN POYANG LAKE ECO-ECONOMIC REGION

In order to study the space structure characteristics of the urban system in Poyang Lake eco-economic region,this thesis has applied fractal model to measure the aggregation dimension,grid dimension,and spatial correlation dimension of this urban system.The result showed that Nanchang and Jiujiang played central roles during the urban system self-organizing evolution(the aggregation dimensions were 1.042 5 and 1.151 6,respectively).Forefathers of the research have noted that the urban system of this region was of "double cores" characteristics,which was confirmed by this paper on the perspective of urban self-organization with aggregation dimension data.The urban system of studied region was distributed and expanded along lines such as roads and railways(capacity dimension 1.035 6,information dimension 1.07,correlation dimension D→1),and major cities in this region were linked with good transportation network(Q=0.941 6).The driving power of system evolution in this region was rather simple(D1≈D0)——the land and water ecosystem of Poyang Lake plain was largely responsible for it.