| Since the reform and opening up,China’s economy has developed rapidly.The Yangtze River Delta has become one of the regions with the most dynamic economy,the highest degree of openness,the strongest ability of scientific and technological innovation,the most complete industrial system and the most convenient factor flow.Industrial agglomeration promotes the economic development of the Yangtze River Delta,but it also brings about environmental problems.In recent years,the contradiction between economic development and environmental protection in the Yangtze River Delta has become more and more prominent,and the development of various cities is uneven.How to unify the overall economic development and environmental benefits of the Yangtze River Delta is worth thinking deeply.Firstly,based on the theoretical analysis of the impact of single industrial agglomeration and heterogeneous industrial collaborative agglomeration on the ecological efficiency of industrial agglomeration,this paper provides a theoretical basis for the analysis of its impact on the ecological efficiency,and measures the industrial agglomeration characteristics of 26 prefecture level cities in the Yangtze River Delta urban agglomeration from 2008 to 2018.Secondly,super efficiency SBM model is used to calculate and analyze the ecological efficiency of each city from 2008 to 2018.Finally,the spatial Durbin model is used to analyze the impact of industrial agglomeration on ecological efficiency,so as to provide corresponding theoretical reference for the high-quality development of Yangtze River Delta urban agglomeration.The results show that(1)the overall agglomeration level of manufacturing industry in the Yangtze River Delta region is on the rise,and the manufacturing industry has a trend of transferring from the east to the West;the overall level of knowledge intensive service industry is lower than that of manufacturing industry,and the agglomeration level of knowledge intensive service industry is on the decline,and the knowledge intensive service industry is gradually transferring to the economically developed regions.The collaborative agglomeration level of the two shows a downward trend,and the industrial development is unbalanced.(2)The average level of ecological efficiency in the Yangtze River Delta region showed a slight downward trend,and the ecological efficiency of each city was quite different.It can be seen that there were obvious differences between the East and the West.Secondly,the ecological efficiency level of the cities around Shanghai and Hangzhou was higher,and the ecological efficiency peak of the Yangtze River Delta region gradually shifted to Shanghai.(3)The agglomeration of manufacturing industry and the collaborative agglomeration of manufacturing industry and knowledge intensive service industry can improve the regional ecological efficiency,and the agglomeration of manufacturing industry has obvious positive spatial spillover effect.However,it is not obvious that the agglomeration of knowledge intensive service industry promotes the improvement of regional ecological efficiency.The level of science and technology can significantly improve the ecological efficiency,and has a significant positive spatial spillover effect,while the estimation of industrial structure and city size parameters is significantly negative,and has a significant negative spatial spillover effect.However,economic development and the level of opening to the outside world have no significant impact on ecological efficiency. |
