关键词: 新疆, 耕地利用, 生态效率, 超效率DEA—SBM模型, 时空演变

Abstract: Taking Xinjiang as the research region, fourteen prefectural and municipal cities in Xinjiang were selected as the sample sites, the indicator system was constructed from the perspective of carbon source and sink, the ecological efficiency of cropland utilisation in Xinjiang was measured by using the super‑efficiency DEA—SBM model and the analysis was conducted  from the perspectives of time and space, and then the dynamic evolution characteristics of ecological efficiency of cropland utilisation in Xinjiang was explored by using the GML index model and the kernel density estimation. Finally, the causes of the loss of ecological efficiency of cropland use were analyzed based on the redundancy rate. The results showed that the average value of the eco‑efficiency of cropland use in Xinjiang was 0.84, which was in the middle‑upper level, and showed the trend of ‘rising‑declining‑rising’. During 2011—2020, the MI index in Xinjiang was greater than 1, and the centre of the curve of the kernel density was shifted to the right, indicating that the eco‑efficiency of cropland use in Xinjiang was improving, and it was in the stage of increasing returns to scale. The inputs and non‑desired outputs of Xinjiang's cropland utilisation eco‑efficiency have not reached the relatively efficient region, and also have some redundancy, and irrational inputs as well as a large amount of carbon and pollution emissions are the main reasons for the ineffectiveness of cropland utilisation eco‑efficiency. Therefore, the following suggestions are put forward to increase the research and development of agricultural science and technology, improve the construction of infrastructure, adjust the input ratio of production factors to improve the ecological efficiency of cropland use, and promote the coordinated development of the region to narrow the regional gap.

Key words: Xinjiang, cropland utilization, eco?efficiency, super?efficiency DEA—SBM model, spatio?temporal evolution