THE SPATIAL-TEMPORAL DIFFERENCES AND SPATIAL CONVERGENCE OF ECOLOGICAL EFFICIENCY IN CULTIVATED LAND UTILIZATION IN THE MAIN GRAIN-PRODUCING AREAS OF THE YELLOW RIVER BASIN——EVIDENCE FROM 60 PREFECTURE-LEVEL CITIES
The main grain-producing areas of the Yellow River Basin undertake the dual task of food and ecological security,and exploring the temporal and spatial evolution characteristics and spatial convergence laws of cultivated land utilization ecological efficiency,which is of practical significance for promoting ecological protection and high-quality development of the Yellow River Basin.The climate production potential,EBM-GML model,nonparametric estimation and spatial convergence model were used to construct an index system for measuring the cultivated land utilization ecological efficiency,and the temporal and spatial evolution,regional differences and spatial convergence laws were measured and analyzed.The cultivated land utilization ecological efficiency in the main grain-producing areas of the Yellow River Basin during the study period showed the following characteristics.(1)On the whole,it showed a downward trend in time and a low-level agglomeration trend in space;(2)From the perspective of regional differences,the changes of Gini coefficients in various regions showed different characteristics.And Sichuan,Inner Mongolia,Henan and Shandong respectively showed"waves",inverted"V","broken lines",and letter"M"shapes;(3)From the perspective of spatial convergence law,the whole and subregions showed significant sigma convergence and absolute β convergence characteristics,and the sigma convergence trend in the region showed obvious positive spatial dependence,while the absolute β convergence trend showed obvious negative spatial dependence.In summary,the main grain-producing areas in the Yellow River Basin can achieve coordinated development of grain production and ecological protection by promoting the efficient use of agricultural resources,narrowing the efficiency difference of regional development,and grasping the convergence trend of spatial distribution.
cultivated land utilizationecological efficiencyclimate production potentialDagum gini coeffi-cientspatial convergence
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