基于断裂点理论的南京经济腹地界定及层次划分

中心城市及其腹地的研究一直是城市地理学的热点。首先，构建多指标体系，运用主成分分析法，计算城市中心性强度，以此修正断裂点模型中的城市人口规模。其次，结合加权Voronoi图方法，勾勒南京与其经济区区外竞争城市间的经济腹地范围和南京与区内周边城市间的经济腹地范围，并采取实证法对理论上的腹地范围进行调整。最后，根据经济联系的强度，将南京经济腹地划分为6个层次。研究表明：南京与区外、区内城市间的经济腹地，两者都呈“红桃心”的形状，但在前者经济腹地中，南京并不位于中心而是偏于东侧；而在后者经济腹地中，南京基本位于中心位置。研究南京经济腹地的范围与层次，有利于南京经济区更科学合理的空间组织和加快长三角地区向西北方向的空间辐射。

SPATIAL SCOPE AND THE LAYER OF NANJING’S ECONOMIC HINTERLAND BASED ON BREAKING POINT THEORY

The research on central city and its hinterland is one of focuses in city geography field all the time.Firstly,by building the index system and applying the method of principal component analysis,the central strength values of cities were calculated.And the central strength 〖JP2〗was used in place of city population〖JP〗 index in breaking point theory.Secondly,by combining with weighted Voronoi diagram,both the spatial scope of economic hinterland between Nanjing and its competitive cities that lie outside Nanjing economic zone and the one between Nanjing 〖JP2〗and its surrounding cities were sketched.And by applying the demonstration〖JP〗 method,the theoretical scope of economic 〖JP2〗hinterland was adjusted according to the real situation of economic〖JP〗 contact,administrative district,natural factor and so on.Lastly,according to the strength of economic contact,Nanjing’s economic hinterland was divided into six layers of economic center,daily hinterland,direct hinterland,indirect hinterland,limited hinterland and competitive hinterland.The result showed that the shapes of the two economic hinterlands are both similar to the shape of ‘’,but Nanjing lies in the east of the former hinterland and in the center of the latter hinterland.The research on the spatial scope and the layer of Nanjing’s economic hinterland is helpful to the rational spatial organization of Nanjing economic zone and the rapid expansion of the influence from the Yangtze Delta area to the north west region.