EVOLUTION OF ECONOMIC SPATIAL-TEMPORAL DISPARITIES AND SPATIAL ECONOMIC STRUCTURE IN CHENGDU METROPOLITAN REGION

Spatial economic structure and regional economic disparities have always been a hot issue for scholars at home and abroad.In the context of a certain time,change in regional economic disparities can be used to show the evolution of the spatial economic structure of certain region.Coefficient of variation and statistical techniques were applied to analyze the evolution of economic spatial-temporal disparities and spatial economic structure in Chengdu metropolitan region by using county as a spatial unit and per capita GDP as measuring index for the level of regional economic development.The CVs curve for inter-county exhibit an invert U shaped pattern from 1999 to 2007 in Chengdu metropolitan region.From the temporal change of the spatial autocorrelation,we found that the Moran's I decreased from 0.70 in 1999 to 0.66 in 2007,which demonstrated that the disparity between rich and poor clusters was narrowed in the same periods.Moran's I scatter plot divided the 59 counties of Chengdu metropolitan region into four types(HH,HL,LL,LH), and the number of HH and LL counties increased from 18 in 1999 to 28 in 2007.By making LISA(Local Indicators of Spatial Association) map,we found all the HH counties located in Chengdu and Deyang,and most of LL counties located far from the economic center of Chengdu metropolitan region.From the whole Chengdu metropolitan region,the clustering effect showed a decreasing trend from 1999 to 2007,but in some areas,polarization effect is increased,and regional disparities were still significant.