Study On The Impact Of Urban Sprawl On Green Development Efficiency

With the rapid development of urbanization in China and the rapid expansion of cities,the phenomenon of urban spread is widespread and significant.In the past,the development mode of emphasizing speed and light quality led to the spread characteristics of high expansion,lowdensity,multi-center and single function area in space,which immediately seriously tested the green and sustainable development and ecological civilization in China.However,urbanization is still the long-term driving force of China’s economic growth.The new urbanization construction should not only focus on the sustainable and stable economic development but also pay attention to green development.The quality of urbanization will eventually affect the quality of China’s future economy.Therefore,the influence of urban sprawl on economic and environmental benefits is particularly important in the context of guiding the high-quality development of urbanization.In order to understand the impact of urban sprawl on urban economy and environment,this paper first calculates the urban sprawl index of 275 prefecture-level cities in China from 2007 to 2020 to represent the degree of urban sprawl in each prefecture-level city and analyzes the characteristics of urban sprawl.Then,the SBM super-efficiency data envelope analysis model with unexpected indicators was used to calculate the green development efficiency with unexpected output in 2007 in these 275 prefecture-level cities from 2007 to 2020,and the characteristics of green development efficiency were analyzed.Subsequently,based on the research results of the theory of urban spatial structure,new urbanism theory and environmental regulation theory,the benchmark panel regression model was constructed to empirically analyze the impact of urban sprawl on green development efficiency in China from 2007 to 2020.To address the effects of the model endogeneity,the dynamic two-step DIFGMM and SYS-GMM models was further constructed.Finally,the panel threshold model is built with environmental regulation as the threshold to study the green development effect of urban sprawl.The research results show that urban sprawl has an inhibitory effect on the efficiency of green development,and environmental regulation promotes the efficiency of green development.There is a threshold effect in the green development efficiency of urban spread under different environmental regulation levels.Heterogeneity analysis by city size found significant differences between large,medium and small cities.In order to promote highquality and green urban development,the urban spatial structure should be reasonably planned,the regional characteristic differences should be deeply considered,and the rational population flow should be guided in an orderly manner.