甘肃省城市势力圈时空格局变化研究

运用主成分法得到甘肃省各城市的中心性指数,并用聚类法划分3个年份的甘肃省城市等级,接着通过构建衡量城市综合规模的指标体系来计算甘肃省主要城市的规模值.在此基础上,应用GIS技术将甘肃省划分为2 km×2 km的格网,利用场强模型对甘肃省16个城市腹地进行划分,比较甘肃省近10年来的城市腹地变化趋势.结果表明：甘肃省各城市的势力圈范围差异较大,势力圈与市级行政范围吻合性较差,区域核心城市势力圈远远超出其行政范围,其中,这3年甘肃城市势力圈面积最大的都是兰州,紧跟其后的分别是嘉峪关、玉门、敦煌市,最小的都是临夏.根据腹地与其市域行政范围的面积比例,将甘肃16个城市分为4类,并提出相应的空间发展策略.

Space-time pattern change for urban hinterland area in Gansu Province

The principal component analysis method was used to get the center index of various cities in Gansu.The cities＇ levels in three different years was divided through GIS clustering method.Then,the urban synthetical scale value was calculated by using complex components.On this basis,Gansu was divided into grids,the scale of which was 2 km ×2 km,with the support of ArcGIS software.The urban hinterland areas of the 16 cities in Gansu were measured by field-strength mode.The results show that there are obvious differences among 16 cities in urban hinterland areas.Meanwhile,the coincidence degree between urban hinterland areas and their administrative region is lower.Circle of regional core city forces far beyond their administrative boundaries.Lanzhou has the largest hinterland area in three period in Gansu,while Linxia has the smallest one.According to the chief administrative area and its hinterland area,16 cities in Gansu are divided into four categories.Finally,the corresponding spatial development strategy was also brought forward.