关键词: 黄河流域, 粮食生产生态效率, 时空演进, 收敛性

Abstract: Improving the ecoefficiency of food production is of great significance for promoting ecological protection and highquality development in the Yellow River Basin. Based on the data of 72 prefecturelevel cities in the Yellow River Basin, the ecoefficiency of food production was measured using the SBMUndesirable model, and its spatial and temporal evolution and convergence characteristics were examined using Kernel density estimation, Markov chain and convergence model. The results showed that, from the perspective of time series, the ecoefficiency of grain production in the Yellow River Basin decreased from 0.735 8 to 0.661 2 during 2006—2009, and increased from 0.664 2 to 0.723 3 during 2010—2020, showing a sequential feature of “first decreasing and then increasing”. The average efficiency values of the three basins were 0.761 9, 0.623 1 and 0.781 1, respectively, showing a longterm stable relationship of “downstream>upstream>midstream”, with the characteristics of polarization and spatial nonequilibrium. From a spatial perspective, there was a spatial clustering of grain production ecoefficiency among the Yellow River Basin regions, and the evolution of efficiency showed the stability of the original state, and it was also difficult to realize leapfrog transfer in the short term. In terms of convergence characteristics, there was no σconvergence in the ecological efficiency of grain production in the whole sample of Yellow River Basin, and other regions in the upper, middle and lower reaches, but there was significant absolute βconvergence and conditional βconvergence.

Key words: Yellow River basin, food production ecoefficiency, spatial and temporal evolution, convergence