应用不平衡指数、全局空间关联指数和局部空间关联指数,采用Arcgis9.2技术,对兰州—西宁区域31个城市进行城市化空间格局定量测量和定性分析。得出结论:①兰州—西宁区域城市体系为倒"丁"字形规模等级结构,而不是金字塔型;②兰州—西宁区域城市化空间格局呈现"Y"字形,以西宁—兰州—陇西段陇海铁路和景泰—白银—兰州铁路为中心轴线,城市化水平从轴线向外围按照距离规则逐渐降低,其中西宁、兰州、白银是轴线上的极点;③近几年核心城市在区域发展中极化性增强,相对于国内生产总值的城市化不平衡指数在增大。同时,区域城市化的全局和局部空间关联指数较小,区域城市化空间关联弱,城市化的"热点区"主要分布在北部区域;④城市化的空间格局呈现出北高南低和西高东低演化趋势。
Using the imbalance index,Getis-Ord General G and Getis-Ord Gi index,and using arcgis9.2 technology,study on the urbanization pattern,from quantitative measurement and the qualitative analysis,of the Lanzhou-Xining area’s 31 cities.The paper make a conclusion that: ①Lanzhou-Xining area’s urban system is reversing "Ding" type scale grade structure,not a pyramid type.②LanZhou-XiNing area urbanization space pattern is the "Y" form.It takes the Xining-Lanzhou-Longxi railroad and JinTai-Baiyin-Lanzhou railroad as centre axis.The urbanization level reduces from the centre to outer-ring,Xining、Lanzhou、Baiyin are the poles of axis.③In regional development,polarization nature strengthens the core the past few years city,to gross domestic product,the urbanization imbalance index enhances,and the Getis-Ord General G and Getis-Ord Gi index reduces,urbanization "hot spot" is located in north.④The urbanization spatial trend is north and west higher than south and east.