Spatial-Temporal Coupling Relationship Between Urban Land Use Efficiency And Carrying Capacity Of Regional Resources And Environment In The Yangtze River Economic Zone

With the speeding of urban economy development and the expansion of city scale,the resource and environmental constrain and the imbalance of land development become more serious.The interaction among region development constructions,the evolution of resources-environment and the sustainable development issues are currently the focus of the academic research.Resource endowment and environmental original condition are the foundation for regional development,while land development and construction are the thrust of resource environment evolution.Resources exploited efficiency and environment quality level can be characterized by resource and environmental carrying capacity which directly affects land space layout and determines land use structure and utilization efficiency.Land use efficiency is an important feature to measure the quality of regional development and utilization,which determines the level of regional development and future potential,and directly affects the improvement of resource and environment carrying capacity.The land use efficiency and resources and environmental conditions interact and restrict each other in the open system.Through the evaluation of urban land use efficiency and its spatial distribution features,combined with the measurement and analysis of resource and environment carrying capacity,the coupling and coordination relationship between the two systems is studied,promoting the interaction between urban land development and resource-environmental systems to continuously evolve and coordinate.Under the above condition,the paper takes the urban area as research object,and uses the socio-economic data and resource and environment data of 110 urban areas in the Yangtze River Economic Zone from 2006 to 2016.Firstly,it quantitatively measures the urban resource and environment carrying capacity and urban land use efficiency,and analyses the quantitative change,spatial distribution and spatial correlation.Then,the coupling model of urban resource and environment carrying capacity and land use efficiency is constructed to explore the degree of coupling coordination and spatial correlation between the two systems.Finally,according to the degree of coupling coordination and the scores of urban land use efficiency and resource & environment carrying capacity,different types of coupling coordination are divided,and corresponding countermeasures and suggestions are proposed to improve the level of coupling coordination of the two systems.The results show that:(1)the urban resource and environment carrying capacity of the Yangtze River Economic Zone is relatively high,while the land use efficiency is at low or medium level with great potential for growth.The two systems are in the primary coordination stage.From 2006 to 2016,the urban resource and environment carrying capacity shows a significant increasing trend with a cumulative growth rate of 2.97%,urban land use efficiency shows a slight upward trend,with an average annual growth rate of 1.09%;and the coordination degree of the two systems have steadily increased by 0.47%.Through the aspect of the space,the resource and environment carrying capacity of cities in the upper reaches of the Yangtze River is higher than that of cities in the middle and lower reaches.The total land use efficiency of cities in the lower reaches is the highest,followed by cities in the upper reaches and cities in the middle reaches.The coordination degree of the two systems gradually decreases from the east to the west,and the cities in the lower reaches of the Yangtze River is higher than that of cities in the middle and upper reaches.(2)The urban resource and environment carrying capacity,urban land use efficiency and the coupling degree of two systems show a certain agglomeration characteristic in space.The spatial positive correlation of urban resource and environment carrying capacity is significant,but the positive correlation agglomeration characteristics decline slightly.The High-High agglomeration area spreads outward along Zhejiang,Jiangsu and Shanghai.The positive correlation characteristics of urban land use efficiency are not enough,but the overall agglomeration characteristics are slightly improved.The range of high value agglomeration is less than the system of resource & environment carrying capacity.The areas with a Low-Low agglomeration pattern are mainly concentrated in the cities with extensive land development and utilization and some economically backward areas.The positive correlation characteristics of the coupling coordination degree of the two systems are not obvious enough.The Low-Low agglomeration cities are mainly due to the low land use efficiency value,which does not match the resource and environment carrying capacity.The spatial agglomeration characteristics of the coupling coordination degree are similar with the characteristics of urban land use efficiency.Land use efficiency is one important constraint of the coordinated development of the two systems.(3)Therefore,attention is fixed on the improvement of land use efficiency,making full use of the existed construction land and control the expansion of urban scale.At the same time,it is necessary to improve the level of resource utilization,pay attention to environment protection,and transform the economic growth model to improve the capacity of urban resources and environment.Open source and reduce expenditure,promote the coordinated development of resource and environment carrying capacity and land use efficiency,and achieve the sustainable development of society economy.