| In recent years,the mileage of high-speed railway has increased rapidly,the number of cities and line density of high-speed railway has been increasing.On the one hand,high-speed railway has changed the way of mass travel,on the other hand,it has a profound impact on the economic and social development.Transportation cost is an important factor affecting economic agglomeration.The time and space distance of high-speed railway is greatly shortened after the opening of high-speed railway,and new changes will happen in the regional economic agglomeration.As one of the seven geographical divisions in China,Southwest China has differences in both natural environment and economic society,which will lead to the difference of regional economic agglomeration characteristics under the background of high-speed rail opening.This paper studies the influence and characteristics of the opening of high-speed railway on the economic agglomeration in Southwest China.Firstly,the paper finds that the high-speed railway opening leads to the rise of the urban economic agglomeration level along the high-speed railway in Southwest China;In the discussion of provinces,it was found that this agglomeration was significant in Sichuan,Guizhou and Yunnan,but not in Chongqing and Guangxi Zhuang Autonomous Region.In addition,the promotion effect of high-speed railway on economic agglomeration will change with the change of the opening-up period of high-speed railway.In the first few years of the opening,the agglomeration effect is not significant,and then the agglomeration effect of high-speed rail will gradually increase,and then gradually decrease after reaching the peak value,and the change of time will show a downward "U" trend;In the discussion of different provinces,it is found that the time change trend of the impact on economic agglomeration has different characteristics in different provinces and cities,and the trend of inverted "U" type change is also found for Sichuan and Yunnan Province;In Guizhou Province,the effect is decreasing;There is no time trend in the influence on Chongqing and Guangxi Zhuang Autonomous Region.Then,the paper constructs the spatial relationship network of economic agglomeration among the regions in Southwest China by using social network analysis method.It is found that the density of spatial relationship network of economic agglomeration in this area increases significantly after the high-speed railway is opened.The regional agglomeration from single to regional central city agglomeration has changed into multi-directional agglomeration among regions,and the inter regional economic agglomeration has increased significantly;After the high-speed railway opened,especially the economic agglomeration relationship that the cities along the high-speed rail line can influence increased significantly,and the relationship transfer attachment to the central city was also significantly reduced;Among them,the highspeed railway has the most obvious influence growth in the spatial network relationship of economic agglomeration for Kunming,Guiyang and Nanning.Finally,it is concluded that the opening of high-speed railway makes the ability of the cities along the high-speed railway in Southwest China to improve the ability of gathering economic resources,and the agglomeration effect is heterogeneous among different provinces and cities;The network of economic agglomeration between regions is more complex,which changes the traditional agglomeration relationship.Therefore,the high-speed railway line in Southwest China should be reasonably distributed,and the coordinated development among regions should be promoted.The economic circle and urban agglomeration should be the main development pole to promote the coordinated and benign development of economy and society in the region. |
