Spatial-temporal Evolution And Its Influencing Factors Of Ecological Efficiency Of Construction Land Use In The Yangtze River Economic Belt

With the rapid advancement of industrialization,the severe situation of tighter constraints on natural resources,aggravated environmental pollution,and degradation of ecosystems makes people begin to pay attention to the protection and restoration of the ecological environment.The new type of urbanization has brought more and more population to the city,and it has also put forward higher requirements for urban supporting infrastructure.The scale of urban construction land continues to expand to meet the needs of production and living,the intensity of land use continues to increase,and the structure of land use Unreasonable problems pose a huge threat to the ecological environment.As a national strategic development area,the quality of the ecological environment of the Yangtze River Economic Belt is related to the survival and development of more than 40% of the country’s population.Although policy documents related to ecological environmental protection and restoration have been issued to promote the in-depth ecological environment governance in the Yangtze River Economic Belt,the problem of ecological environmental pollution in the Yangtze River Economic Belt cannot be underestimated.As the economic activity that has the greatest impact on the ecological environment,land use activities deserve attention on how to reduce the cost of the ecological environment and improve the level of ecological efficiency in the process of its development and utilization.Therefore,this paper studies the ecological efficiency of construction land in the Yangtze River Economic Belt to provide a path for optimizing ecological efficiency.This paper takes the ecological efficiency of construction land use in the Yangtze River Economic Belt as the research object.On the basis of combing and summarizing relevant domestic and foreign literatures and theories,this paper chooses to establish an input-output index system including undesired outputs,and uses the super-efficiency SBM model to analyze the 2005-Measure the ecological efficiency of construction land in the Yangtze River Economic Belt in 2019,and analyze and study the evolution of the ecological efficiency of construction land in the Yangtze River Economic Belt from two levels of time series and space;Then,with the help of Geoda,the spatial correlation test of the ecological efficiency of construction land in the Yangtze River Economic Belt was completed,and the spatial correlation of the ecological efficiency of construction land in the Yangtze River Economic Belt was proved.Finally,the spatial econometric model was used to analyze the influencing factors of the ecological efficiency of construction land.Concluded as follow:(1)From the perspective of time series,the ecological efficiency of construction land use in the Yangtze River Economic Belt has not reached an effective level during the period,and the overall efficiency has increased,and there is still much room for optimization.Eco-efficiency varies greatly among regions during the study period.The ecological efficiency of construction land use in the upper reaches of the Yangtze River Economic Belt is always higher than that in the upper and middle reaches.The average value of ecological efficiency in the middle and upper reaches of the Yangtze River Economic Belt is lower than the overall level.The eco-efficiency of construction land use in the upper,middle,and downstream regions does not appear to be distributed in a step-like manner,and there are obvious differences between the levels of eco-efficiency between provinces and cities.Shanghai,Jiangsu and Zhejiang swept the top three,while Chongqing and Guizhou ranked last with the lowest efficiency.(2)From the perspective of space,the spatial distribution of ecological efficiency of construction land use in the Yangtze River Economic Belt is uneven.High-efficiency cities are mainly concentrated in the downstream areas,and medium and high-efficiency cities are concentrated in the mid-stream areas.During the study period in the upstream areas,there is a certain degree of ecological efficiency of construction land.decline.There is a significant spatial correlation in the ecological efficiency of construction land.The spatial agglomeration of the ecological efficiency of construction land use has gradually increased,indicating that there is a certain degree of spatial spillover effect in the ecological efficiency of construction land.Cities with high agglomeration are mainly distributed in areas with good economic development in the lower reaches of the Yangtze River Economic Belt.Low and low agglomeration cities are mainly concentrated in the upper and middle reaches,such as Jiangxi,Hubei and other places;the distribution of low and high cities is more flexible,gradually spreading from the upper reaches of the Yangtze River Economic Belt to the middle and lower reaches over time;Large-scale cities have also moved closer to the middle reaches of the Yangtze River Economic Belt from the upper and lower reaches of the Yangtze River Economic Belt over time.(3)At different significance levels,each influencing factor has different effects on the ecological efficiency of construction land.Science and technology investment and residents’ living standards passed the significance test at the level of 1%,which had a positive effect on ecological efficiency;opening to the outside world,industrial structure and environmental endowment passed the significance test at the levels of 10%,5%,and1%,respectively.The three inhibit the improvement of eco-efficiency;while economic development and population size fail the significance test and have no significant impact on eco-efficiency.