Spatial effects of urban expansion and high-speed rail network on urban land green use efficiency:Theoretical analysis and empirical evidence
Land is an important carrier of resource elements,and improving urban land green use efficiency(ULGUE)is the key to realize"smart growth".On the basis of phenomenon observation and theoretical construction,this study takes 268 cities in China from 2008 to 2019 as research units,integrates multi-source data,and combines ArcGIS analysis,EBM-DEA model and spatial econometrics model to reveal the spatial effects of high-speed rail network and urban expansion on ULGUE.The results show that:(1)Chinese LGUE has certain gradient distribution and spatial dependence characteristics;its core density curve has shifted to the right as a whole,the peak value has continued to decline,and the efficiency of land resource use has improved.(2)There is a significant nonlinear relationship between urban expansion and ULGUE,and maintaining a reasonable urban expansion can significantly enhance ULGUE.High-speed rail network accelerates the optimal allocation of resources and has a strong positive spatial effect on ULGUE.(3)From the perspective of spillover effect,urban expansion has significantly improved the local ULGUE,but it is the opposite for neighboring cities;The high-speed rail network has strong positive externalities for local city ULGUE,but we must be wary of its"siphon effect"that has a negative impact on neighboring cities.(4)In terms of regional heterogeneity,capital cities are able to alleviate the pressure of urban operations through urban sprawl and enhance ULGUE.However,non-provincial capital cities and central and western regions should rationalize their spatial development boundaries to achieve"smart growth".Therefore,it is necessary to formulate differentiated spatial expansion strategies according to local conditions and form a new development pattern in which land development and utilization are compatible with the economy,industry,and ecological environment.In terms of mediating effects,economic agglomeration acts as a mediator between urban expansion and ULGUE,while the high-speed rail network enhances ULGUE by promoting the upgrading of industrial structure.Currently,China is in a rapid stage of urbanization and high-speed rail development,and it is expected that this study will provide support for enhancing the comprehensive effectiveness of green land use and promoting high-quality sustainable regional development.
urban land green use efficiencyspatiotemporal evolutionspatial effecthigh-speed rail network
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