中国水资源-能源-粮食纽带系统效率时空分异特征

Spatial-temporal differentiation characteristics of water resources-energy-food nexus system efficiency in China

采用SBM-DEA模型、网络DEA模型及双变量空间自相关方法对1997—2017年中国30个省级行政区的水资源-能源-粮食纽带系统(WEF系统)效率进行测度,并分析了其时空演化特征。结果表明:研究时段内,中国水资源、能源、粮食3个子系统的效率值呈现逐年上升趋势,水资源子系统、粮食子系统的效率值提升趋势明显,能源子系统效率值提升速度较为缓慢,空间分布上东部地区各子系统的效率值明显高于中部和西部地区;水资源子系统、能源子系统、粮食子系统效率值之间的空间相互作用存在一定差异,但协同作用的地区分布范围较为一致;中国WEF系统效率值呈波动上升趋势,而区域分布上,东部地区、东北地区、中部地区、西部地区的效率平均值呈依次下降的趋势,高效率区主要分布在东部沿海与黄河流域中下游地区,而西部地区则是低效率聚集区。

SBM-DEA model,network DEA model and bivariate spatial autocorrelation method were used to measure the efficiency of water resources-energy-food nexus system(WEF system)of 30 provincial administrative regions in China from 1997 to 2017,and the spatial-temporal evolution characteristics were analyzed.The results show that during the study period,the efficiency values of water resources,energy and food subsystems in China showed upward trends year by year.The efficiency values of water resources subsystem and food subsystem showed apparent upward trends while the efficiency value of energy subsystem increased slowly.The efficiency value of each subsystem in eastern region was significantly higher than that in central and western regions.There were certain differences in the spatial interaction among the efficiency values of water resources,energy and food subsystems,but the regional distribution range of synergy was relatively consistent.The efficiency values of WEF system in China were on the rise with fluctuation.In terms of regional distribution,the efficiency values were relatively high in eastern and northeastern regions while low in central and western regions.The high efficiency values were mainly distributed in the eastern coastal areas and the middle and lower reaches of the Yellow River Basin,while the western regions were low efficiency areas.