SPATIAL STRUCTURE EVOLUTION ANALYSIS OF COUNTIES ECONOMIC DISCREPANCY IN THE URBAN COMPACT AREA OF LANZHOU-XINING

Based on the economic development statistics of 35 counties in the Urban Compact Area of Lanzhou-Xining,the paper evaluates the county economic discrepancy by SPSS and GIS.According to the economic level scores,the 35 counties are divided into four main categories.Then we analyses the spatial structure of county economic level and its evolution trend from 2000 to 2008.Conclusions as follows: since 2000,the economic disparities of county level have decreased,the economic developed counties are distributed along Huangshui river and Lan-Qing railway;the spatial disparity of county's economic level mainly presents core-periphery sphere structure,following the spatial distance attenuation,and north-south disparity and east-west disparity are forming.The spatial agglomeration areas of middle-level economic development are constantly expanding,changing from patechy distribution to planar distribution during 2000-2008,the low growth counties gather in the south of the urban compact area.