Measurement of cultivated land green use efficiency based on carbon emission and its influencing factors: A case study of 39 cities in the Yangtze River Basin

Abstract

In order to promote the high-quality development of cultivated land and ensure food security, based on the carbon emissions in the process of cultivated land use, this study incorporated the total carbon emissions of each carbon source and the food security factor of the study area into the calculation system of cultivated land use efficiency（CLGUE）. Using the Super-SBM model, kernel density estimation and geographic detector method, the CLGUE values in 39 cities in the upstream, midstream and downstream of the Yangtze River Basin from 2011 to 2020 were specifically measured, their temporal and spatial heterogeneity was described, and the influencing factors were detected at both single and interactive levels. The results showed that: （1）The green land use efficiency values of cultivated land in the Yangtze River Basin show an overall upward trend during the decade of 2011-2020；（2）There is a clear spatial heterogeneity the CLGUE values in the Yangtze River Basin cities, as shown by: downstream region > midstream region > upstream region; (3) Cultivated land resource endowment, socioeconomic development, and agricultural production technology are important factors affecting the variability of CLGUE values. However, there are some differences in the degree and direction of influence of different influencing factors on different sample subgroups.