The Spatio-Temporal Evolvement of Spatial Interaction Among Cities of South Central Liaoning
用改进引力模型和GIS方法分析辽中南城市间人流、物流等互动的时空变化，发现整体互动减弱，沈阳中心性强但辐射下降，大连辐射不足，鞍山成为新辐射中心。
Spatial interaction among cities is a process of transferring people flow, goods flow, information flow, capital flow as well as technology flow. The spatial interaction strength directly affects the coordinated development of urban agglomeration and overall competitiveness. This article calculates and analyzes the spatio-temporal evolvement of spatial interaction among cities of south central Liaoning by using the improved gravity model, potential model and GIS spatial analysis method. Some conclusions can be draw as follows: 1)The spatial interaction strength of south central Liaoning has been gradually weakened as a whole, moreover the strengths between Shenyang and other cities are generally strong and the centrality of Shenyang in the region is reflected.But the strengths are decreased and some increased,which come with no regularity.2) The spatial interaction strengths between Dalian and the most of other cities are weak, visibly Dalian fails to give full play to radiate effect. Among other cities, except Liaoyang and Anshan, the spatial interaction strengths are all at low level and less volatile. 3) The features and evolution laws of spatial differentiation and spatial diffusivity of the city potential in south central Liaoning are obvious and takes on a general declining trend over the last decade. 4)The city potential values of Shenyang, Anshan and Fushun has been ranked the top three but fluctuate pronouncedly. And the diffusivity of these three regions is also stronger than the other. Especially Anshan begins to show a significant role in external radiation and becomes the new radiation center. The potential values of other cities are relatively lower and show no obvious fluctuation.