Cultivated Land Use Efficiency and Influencing Factors in Karst Area of Southwest China

Taking karst area of southwest region in China as research area，selecting cultivated land use efficiency indicators from two dimensions of input and output，data envelopment analysis（DEA）method was used to analyze cultivated land use efficiency of 112 cities in the district from 2011 to 2017，and key factors affecting cultivated land use efficiency were analyzed by using geographic detector model.Results showed that，first，from perspective of time changes，comprehensive efficiency，technical efficiency and scale efficiency of cultivated land use in karst areas of southwest China showed a trend of“first rising and then declining”from 2011 to 2017.Second，from perspective of spatial changes，comprehensive efficiency and technical efficiency had moderate spatial differentiation，scale efficiency had weak spatial differentiation.High value area of cultivated land use efficiency in the whole study area was basically continuous distribution，while low value area was“flower arrangement”distribution.Third，geographic detector analysis showed that karst proportion（q=0.24）and elevation（q=0.21）were the main influencing factors of cultivated land use efficiency in southwest karst area，and the interaction of influencing factors enhanced influence on cultivated land use efficiency in southwest karst area.