Gradient transformation and influencing factors of urban green economy efficiency in the Yangtze River Economic Belt
Improving the efficiency of regional green economy is not only the key to achieving high-quality regional development,but also an important means to promote coordinated regional development.Revealing the gradient transformation law and influencing factors of regional green economy efficiency is of great significance to promote regional green comprehensive transformation and coordinated development.This paper uses the super-efficient EBM-GML model to measure the urban green economy efficiency of the Yangtze River Economic Belt,compares and analyzes the changes of regional green economy efficiency spatial gradient pattern before and after the strategy of"promoting well-coordinated environmental conservation and avoiding excessive development"in the Yangtze River Economic Belt in 2016,and then uses the spatial Markov chain and spatial econometric model to reveal the transformation law and influencing factors of green economy efficiency gradient.The results show that:(1)From 2003 to 2020,the overall green economy efficiency of the study area showed a continuous upward trend,and since 2016,the green economy efficiency has increased significantly,and technological progress is the main source.(2)The green economy efficiency showed a vertical"～"gradient strengthening trend along the upper,middle and lower streams,while from the horizontal perspective from the main stream and its sides,it showed a flattened to inverted"U"gradient transformation.(3)Since 2016,the green economy efficiency has developed well,and the positive spatial spillover effect of high-gradient cities has been highlighted,which has significantly enhanced the"path breakthrough"effect of low-gradient cities.(4)Economic development,urban scale,investment intensity,and environmental regulations have positive externalities for the gradient transformation of green economy efficiency,while industrial structure and opening-up have negative spillover effects.Comparing the two periods,we found that the driving factors for the gradient transformation of green economy efficiency have undergone significant changes.Among them,the indirect effects of economic development level,urban scale,industrial structure,and government intervention on green economy efficiency have been strengthened,while the direct effects of environmental regulations have been enhanced.
green economy efficiencygradient transformationspatial Markov chainspatial spillover effectsYangtze River Economic Belt
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