Spatial-temporal differentiation and influence mechanism of industrial green water resources efficiency in Changjiang River Economic Belt

Improving the efficiency of green water resources is not only the key content of the construction of water ecological civilization in the Changjaing River Economic Belt, but also an important focus to promote the high-quality development of the whole basin.Following the concept of green ecology, the super efficiency SBM model considering unexpected output and geographically weighted regression model were introduced.Based on the comprehensive evaluation of the multi-dimensional change characteristics of industrial green water resources utilization efficiency in the Changjiang River Economic Belt from 2005 to 2019,the temporal and spatial differentiation characteristics and driving mechanism were further examined, and specific suggestions were given according to the influencing factors.The results showed that during the investigation period, the utilization efficiency of industrial green water resources in the Changjaing River Economic Belt was ‘stable and improved',but the inter provincial difference was significant.At the same time, it still had a certain convergence effect in the long run, and would reach the basin balance at a convergence rate of 3%;The macro spatial distribution of industrial green water resources efficiency in the basin was ‘downstream>upstream>midstream',the efficiency gradient difference in the north-south direction was significantly reduced, and the radiation effect of the efficiency leading area on other areas was relatively weak; The utilization efficiency of industrial green water resources in the basin had significant spatial heterogeneity impact mechanism characteristics.Among them, the driving effect of industrialization level was the strongest, but most provinces and cities in the Changjiang River Economic Belt were difficult to achieve its positive driving.The average positive driving coverage of urban operation level was the widest, and the transformation ability of water-saving and emission reduction technology driven by population quality level was relatively weak.The research results can provide theoretical basis for improving the efficiency of industrial green water resources in the Changjiang River Economic Belt and realizing regional collaborative water resources management.