The spatial structure of metropolitan area is the most integrated and most diverse part of urban system. It is composed by different ranks of spatial elements such as cities (nodes), spatial flows (functional linkages), channels (linkage axis) and action fields (the attraction range of each city) and so on. The spatial structure of metropolitan area is represented as the spatial combination relationship of three factors including point (city and urban system), line (economic linkage channels) and surface (urban hinterland). Based on the statistical data of Wuhan metropolitan area in recent years, using SPSS mathematical statistical technique and GIS spatial analysis function, we build an economic linkage intensity model and investigate the dynamic characteristics of the spatial competition and its range of Wuhan metropolitan area. It is found out that: (1) there are some main linkage directions in the external economic linkage of central cities, and its temporal inertia and spatial polarization are also very obvious; (2) the external economic linkage intensity of central cities is distance decay, which leads to a regional layered spatial structure. Then from the aspects of point, line and surface, we build and compute some useful indices which are the centralities of economic linkage node (central city), the network connectivity of economic linkage channels (transportation network) and the regional organization of economic linkage range (urban hinterland). With the aid of these indices, we can quantifiably analyze and point out the hierarchical characteristics of the economic linkage spatial structure of Wuhan metropolitan area. It is concluded that: (1) the centrality hierarchy of central city is quite different, their spatial distribution is uneven and has close relationship with transportation location; (2) the development and service function of linkage channel is hierarchical, and two inter-city transportation channels have been formed significantly; and (3) the influence range of economic linkage is closely related to external economic linkage intensity of central cities, and it is also greatly affected by its regional natural condition and administrative regionalization.
LIU Cheng-liang, YU Rui-lin, XIONG Jian-ping, ZHU Jun-lin, ZHANG Hong
. The spatial structure of economic linkage of Wuhan metropolitan area[J]. GEOGRAPHICAL RESEARCH, 2007
, 26(1)
: 197
-209
.
DOI: 10.11821/yj2007010024
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