Study on the Decoupling Relationship between Economic Urbanization and PM2.5 Concentration in the Middle Yellow River Region Based on Grid Scale
In view of the lack of current grid data of economic urbanization,this study took the middle Yellow River as an example,and proposed a spatial simulation method of economic urbanization parameters using high-precision land use grid data and statistical yearbook data from 1995 to 2018.The spatial and temporal pattern of economic urbanization and the decoupling relationship between economic urbanization and PM2.5 concentration in the middle Yellow River were analyzed.The results show that:(1)The level of economic urbanization in the middle reaches of the Yellow River shows a multi-core circle structure with the core of Lanxi city cluster,Xi'an city circle,Taiyuan city circle and Zhengzhou-Luoyang city belt.(2)In the evolution of spatial pattern,there are differences in the expansion mode of economic urbanization in different regions.The economic urbanization of the Luohe River basin,the Fenhe River basin,Guanzhong Plain and Taiyuan metropolitan area shows the characteristics of belt expansion with the central cities as the center due to the limitations of terrain and hydrological conditions.Lanxi city cluster,Zhengzhou-Luoyang city belt and Hohhot show the characteristics of circular expansion with the central cities as the core.(3)After 2005,the central and eastern parts of the middle Yellow River began to show a decoupling turning point.After 2010,the western region of the middle Yellow River began to show a turning point of decoupling.However,due to the implementation of the Western development policy,the area of expanding negative decoupling areas in Gansu and southern Ningxia increased significantly from 2015 to 2018,and the decoupling relationship between economic urbanization and PM2.5 concentration changed again.
economic urbanizationland useregression modelPM2.5 concentrationdecoupling state
NETL
NSTL
万方数据
