关键词: 玉米用水效率, 地区差异, 空间收敛性, 黄河生态经济带, 环境规制

Abstract: Based on the perspective of environmental regulation, the carbon emission, non-point source pollution, and grey water footprint were included in the ultra-efficiency SBM model to measure the water efficiency of corn in prefecture-level cities in the Yellow River ecological economic belt from 2011 to 2020, and the regional differences and spatial convergence were analyzed by using Dagum Gini coefficient and spatial Durbin model. The results showed the overall corn water efficiency improved significantly during the sample period, and technological progress was the main driving force; the overall and internal regional gap was gradually expanding, and the changes between regional differences were consistent; there was a significant spatial spillover effect and β convergence trend, but the significant effect of related variables convergence had heterogeneity. Based on this, in order to further improve the corn water efficiency and optimize the spatial layout in the Yellow River ecological economic belt under environmental regulation on the whole, some suggestions of strengthening dynamic testing, implementing water-saving rules, promoting regional coordination, carrying out comprehensive remediation, increasing technical investment and guiding multi-party coordination were put forward.

Key words: corn water efficiency, regional differences, spatial convergence, Yellow River ecological economic belt, environmental regulation