| In recent years,with the rapid development of resource-based industries,the development of resource-based industries in the Yangtze river economic belt is confronted with the problems of urgent need to optimize the layout structure and great differences in regional development.In the context of economic globalization and regional integration,faced with resources advantages and problems of industrial development,resources industry should rely on the Yangtze river economic belt area of the Yangtze river economic belt of abundance of mineral resources,strong industrial base,the advantages of the convenient transportation channel,to coordinate,resource utilization and ecological environment protection,the relationship between promote synergy upstream and downstream industry cluster development,construct the resources industry coordinated development new pattern.This paper selects 31 resource-based cities in the Yangtze River Economic Belt as the research object,choose 2008 to 2017 as the study period.The super-efficiency DEA model is used to measure the ecological efficiency of the city,the degree of industrial agglomeration of the resource-based upstream and downstream is measured using location entropy.Using industrial collective agglomeration index to measure agglomeration correlation effects of upstream and downstream industries.Finally,a new type of environmental Kuznets curve is introduced,and a spatial panel model is used to test whether Kuznets exists between resource-based upstream industries,resource-based downstream industries,industrial agglomeration,and urban ecological efficiency Curve,so as to reasonably analyze the effect mechanism of resource industrial agglomeration on urban ecological utility.(1)The study found that the ecological efficiency of 31 resource-based cities exhibited a dynamic state of fluctuation during the observation period.The overall level of ecological efficiency in the study area is not high.Chenzhou,Guangyuan,Nanchong,Tongling,Xuzhou,Hengyang,Zigong and Panzhihua are at the optimal level.The average eco-efficiency of the four types of cities is growing in order from large to growth city> regenerative city> mature city> decay city.(2)The upstream and downstream resources-based industries in 31 cities have formed a stable concentration trend.Huainan,Huaibei,Panzhihua and Liupanshui have absolute advantages in the development of their upstream mining and selection industries.The collective agglomeration index of the upstream and downstream industries of the resource-based industries in the 31 cities as a whole has shown a slowly rising trend.The upstream and downstream agglomerations of the resource-based industries are becoming more and more relevant,and there is a large difference in the level of industrial common agglomeration between regions.(3)There is a U-shaped curve relationship between the ecological efficiency and industrial agglomeration of 31 resource-based cities in the Yangtze River Economic Belt,most cities has passed the inflection point;a U-shaped curve relationship exists between the resource-based upstream industrial agglomeration and ecological efficiency,more than half the cities didn’t pass the inflection point;the current concentration of resource-based downstream industries has not objectively alleviated the pressure on the environment and resources,or their effect on ecological efficiency has not yet been shown.Environmental regulations and economic development have significantly promoted the improvement of ecological efficiency,while foreign direct investment have inhibited the development of ecological efficiency. |
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