| With the acceleration of urbanization and industrialization,regional development and construction,the demand for urban land is increasing rapidly,and the problem of land sprawl is becoming more and more serious."high input,high energy consumption and high emission" as the leading development mode has become an obstacle to regional sustainable development and ecological civilization construction.The intensive land use and ecological environment interact and restrict each other.To strengthen the interaction between urban land efficient use and regional ecological efficiency has gradually become a powerful hand for the country to deal with the environmental problems caused by extensive land use and to promote regional coordination.Based on the measurement and analysis of urban land intensive level and regional ecological efficiency,this paper studies the coordination relationship between the two systems,with a view to strengthening the positive interaction between the two systems and realizing the optimal intensive utilization of urban land under the green ecology,and then promote the regional sustainable development to provide reference.Based on the 2005-2018 socio-economic,land use,resource and environmental data of 41 prefecture-level cities,the research area is Yangtze River Delta Economic Zone.Firstly,the global principal component analysis is used to extract the principal component influencing factors of land intensive use system,measure the land intensive use level of each city and analyze its space-time characteristics and evolution Based on the above-expected-output-based super-efficiency SBM model,the MALMQUIST index(MSI)and the relaxation rate(LR)were introduced to measure the regional eco-efficiency.Then,the coupling coordination model of urban land intensive use level and regional eco-efficiency is constructed,and the coupling coordination between the two systems and its spatio-temporal evolution and spatial correlation characteristics are explored Finally,according to local conditions to put forward countermeasures and suggestions.The findings suggest:(1)from 2005 to 2018,the level of intensive use of urban land in Yangtze River Delta Economic Zone has increased from 0.432 in 2005 to 0.752 in 2018,with an average annual growth rate of 2.46%,which shows a steady upward trend.The average annual growth rate of provincial intensive level is: Shanghai(11.45%),Zhejiang(10.21%),Jiangsu(8.36%)and Anhui(8.19%).In 2005,the land intensive use level of 41prefecture-level cities was mostly concentrated at a low level,and more than half of the cities reached a high level and a high level in 2018.The average annual growth rate of most urban land intensive use was decreasing in 2005-2010,2015-2010,2015-2018.The land intensive utilization level of Yangtze River Delta Economic Zone city is obviously different in different regions.The cities with high land intensive level develop from the southeast end of Yangtze River Delta Economic Zone to the outside,and are distributed along the development zone of Huning and Hangyong.(2)From 2005 to 2018,the eco-efficiency of Yangtze River Delta Economic Zone has increased from 0.334 in 2005 to 0.661 in 2018,with an average annual growth rate of2.17%,and then there’s a big increase.The average annual growth rate of regional eco-efficiency was 6.07% in Shanghai,2.88% in Zhejiang,2.75% in Jiangsu and 0.95%in Anhui.The mean value of the overall Malmquist index is 1.072,and the regional eco-efficiency increases slightly under the double promotion of technical efficiency and technical progress.There are serious problems of excessive undesired output,redundant capital and land input in cities.On the whole,the regional eco-efficiency is low.At the end of the study period,there are still 27 urban areas in the general level of eco-efficiency and below.In 2010,the regional eco-efficiency was high in the east and the middle,and low on both sides(southwest Anhui and south Zhejiang),in 2018,cities with high value zones were scattered in provincial capitals,the southern Jiangsu-shanghai link and coastal cities.(3)From 2005 to 2018,the Yangtze River Delta Economic Zone cities were mainly ecological efficiency lagging type,the coupling degree basically belonged to antagonistic coordination state,and the difference of coupling degree between different cities was not obvious.From 2005 to 2018,the coupling degree of urban land intensive use level and regional eco-efficiency increased from 0.528 in 2005 to 0.745 in 2018,with an average annual growth rate of 1.5%.With the exception of some cities such as Bozhou,which experienced a decline in some years,the coordination of the two systems in 41 cities has been slowly improving year by year.The overall situation is at a stage of basic coordination and is on the verge of maladjustment,there is much room for improvement from the high-level coordinated development.In the spatial pattern,the coupling coordination degree decreases from east to west,and the relatively high value area expands gradually along the southern Jiangsu and the eastern Zhejiang coastal cities with Hangzhou and Ningbo as the two wings.(4)The coupling degree of Yangtze River Delta Economic Zone land intensive use level and regional eco-efficiency has positive spatial correlation in 2005,2010,2015,2018,spatial correlation first increased and then decreased,and was strongest in 2010.There were 7,10,4 and 5 H-H-type cluster cities in 4 years.Shanghai,Suzhou and Wuxi were separated from high cluster The number and spatial variation of H-L and L-H type cities are very small,and the L-L type cities are mainly concentrated in northern Anhui.After2010,with the fluctuation of regional eco-efficiency and the increase of spatial heterogeneity,the spatial diversity of coupling coordination degree is further enhanced. |
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