中国粮食生态效率:水平测度、时空格局演变与影响因素OA北大核心CSTPCD

To reveal the level and variation characteristics of China's grain production eco-efficiency,this paper estimates the grain eco-efficiency of 30 provinces from 2000 to 2021 based on the super-efficiency SBM model,reveals its evolution characteristics through non-parametric kernel density analysis,and analyzes its influencing factors through fixed effect model.The results show that:from the perspective of grain eco-efficiency level,China's grain eco-efficiency increased from 0.662 to 0.787 from 2000 to 2021,with an average annual increase of 0.827%.The change trend of grain eco-efficiency in the main production area and the production and marketing balance area is similar to the national level,while the main sales area is far lower than the national average;from the perspective of the evolution of spatial and temporal patterns,China's grain eco-efficiency has long been polarized between high-high agglomeration and low-low agglomeration,and has gradually gathered to a higher level over time,showing the characteristics that the north is higher than the south,and the major producing areas are higher than the non-main producing areas.Among the influencing factors,the influence of per capita GDP and grain operation scale is significantly positive,and the influence of chemical fertilizer application intensity,agricultural machinery intensity and natural disasters is significantly negative.The research shows that the overall level of China's grain eco-efficiency is still low and the regional gap is large.Most provinces have not reached the efficiency frontier,and there is a large room for improvement.