SPATIAL-TEMPORAL DIFFERENTIATION AND INFLUENCING FACTORS OF AGRICULTURAL ECOLOGICAL EFFICIENCY IN COUNTIES OF YUNNAN PROVINCE
The terrain of Yunnan province is rugged,rich in three-dimensional climate resources,and has obvious advantages in plateau characteristic agriculture.In this paper,the agricultural ecological efficiency of Yunnan province is measured using the super efficiency SBM model,and ten driving factors are selected from three dimensions:agricultural production conditions,socio-economics,and natural ecological environment to analyze their impact on agricultural ecological efficiency.Based on panel data of 129 counties(cities,districts)in Yunnan province from 2008 to 2018,combining spatial autocorrelation models and geographic detectors,this paper conducted an empirical study on spatial-temporal evolution,spatial heterogeneity and influencing factors of agricultural ecological efficiency in counties of Yunnan province.The results were listed as follows.(1)The overall agricultural ecological efficiency of counties in Yunnan province was at a medium level with a downward trend,and presented a"U"-shaped distribution pattern with relatively high efficiency in the eastern,western,and northern parts,and low efficiency in the central part,with greater differences between east-west than north-south.(2)From the perspective of global spatial autocorrelation,there were significant positive correlations and spatial clustering of fluctuation in agricultural ecological efficiency among counties in Yunnan province.From the perspective of local spatial autocorrelation,the number of counties with positive correlation of agricultural ecological efficiency was gradually decreasing,and the aggregation was decreasing.The High-High(HH)aggregation of agricultural ecological efficiency was mainly distributed in the northwest and south of Yunnan province,and showed an obvious trend of spreading to adjacent counties;the Low-Low(LL)aggregation was mainly distributed in the central and southeast parts of Yunnan province.(3)In terms of influencing factors,socio-economic factors were still the main influencing factors of agricultural ecological efficiency,but their impact was continuously decreasing,while the explanatory power of natural ecological environment factors,especially terrain ruggedness,was increasing.In summary,The impact of different driving factors on spatial differentiation is significant,and the interaction of driving factors can enhance the spatial differentiation of agricultural ecological efficiency.The spatial-temporal differentiation of agricultural ecological efficiency in counties of Yunnan province is significant,and socio-economic factors are the main driving factors for spatial differentiation.However,natural ecological environment factors,such as terrain ruggedness and precipitation,have a more significant impact on agricultural ecological efficiency.
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