时空异质性视角下农业用水效率及其驱动因素分析OACHSSCD

Improving the efficiency of agricultural water use is the key to alleviate the contradiction of agricultural water use,and it is also the important way to ensure national food security and accelerate the cultivation of new agricultural productivity.Based on the panel data of 16 prefecture-level cities in Shandong province from 2013 to 2022,the non-expected SBM model was used to explore the spatiotemporal evolution characteristics of agricultural water use efficiency in 16 prefectures and three major economic circles,and the key driving factors affecting agricultural water use efficiency and their spatiotemporal heterogeneity were further investigated by combining the Tobit model and GTWR model.The results were indicated as follows.(1)At the overall level,the agricultural water efficiency of Shandong Province showed a rapid upward trend.At the prefectural and municipal level,the development of agricultural water efficiency in various cities is obviously different,among which Dezhou City has the largest agricultural water use efficiency value,Dongying City has the fastest development rate,while Weihai City has the smallest agricultural water use efficiency value and the slowest development rate.At the level of the three major economic circles,agricultural water efficiency shows a distribution pattern of"provincial capital economic circle>Lunan economic circle>Jiaodong economic circle",among which the overall level of the provincial capital economic circle is relatively balanced,the overall level of the Jiaodong economic circle is low,and the Lunan economic circle is seriously polarized.(2)The per capita water resources,water supply structure and farmers'income level have a positive effect on agricultural water use efficiency in Shandong Province,while the effective irrigation rate,agricultural machinery input intensity,rural social structure and financial support have a inhibitory effect on it.(3)The differences in the driving effects of per capita water resources,effective irrigation rate,farmers'income level,rural social structure and financial support on agricultural water efficiency among the three major economic circles in Shandong Province showed a narrowing trend,the difference in water supply structure showed an expanding trend,and the difference in agricultural machinery input intensity did not change much,but its inhibitory effect on agricultural water efficiency in each economic circle showed an increasing trend.At the same time,the agricultural water efficiency of all economic circles in Shandong Province is most promoted by the income level of farmers,the agricultural water efficiency of the provincial capital and Jiaodong Economic Circle is most inhibited by the effective irrigation rate,and the agricultural water efficiency of the Ludong Economic Circle is most inhibited by the input intensity of agricultural machinery.Therefore,it is necessary to actively promote the coordination of the economic and ecological benefits of agricultural water use,realize the"multiple drives"of high-quality development of agricultural water.