Spatiotemporal evolution of the green efficiency of industrial water resources and its influencing factors in the Poyang Lake region

Improving the green efficiency of industrial water resources (GEIWR) in the Poyang Lake region is an effective way to address the inefficient use of regional water resources and mitigate severe industrial water pollution. This paper uses the super efficiency slack-based measure (SBM) model to analyze the spatial and temporal evolution of the GEIWR from 2005 to 2019, and use the Tobit regression model to explore the factors affecting the GEIWR in the Poyang Lake region. The results are as follows. First, the average value of the GEIWR in the Poyang Lake region is 0.71, and the overall level is high, but the regional differences are apparent. Second, the overall GEIWR in the region show an increasing trend, but the development of various regions is uneven, and the difference in pure technical efficiency among cities is the main reason for the difference in the GEIWR from 2005 to 2019. Third, Jingdezhen is the city with the lowest GEIWR, and it is also the key to improving the overall efficiency of the region. Finally, the treatment capacity of industrial wastewater facilities, the government's deployment of science and technology expenditures and the degree of industrialization have a positive impact on the GEIWR. The economic development level and industrial water intensity have no obvious correlation with the GEIWR in the Poyang Lake region.