京津冀绿色水资源利用效率及其时空差异与驱动因素分析

京津冀是我国水资源短缺情况最为严重的地区之一，提高绿色水资源利用效率是从根本上解决该地区水资源供需矛盾、实现经济-社会-生态和谐发展的必由之路。基于考虑非期望产出的Super-SBM模型测度2008-2018年京津冀城市群绿色水资源利用效率并对其时空差异进行分析，随后利用地理探测器模型探究绿色水资源利用效率驱动因素。结果表明：研究期内京津冀城市群绿色水资源利用效率均值处于非有效状态，且呈不稳定的波动态势，城市群内部效率极差较大；绿色水资源利用效率地区差异明显，北部地区高于南部地区，且南北差异呈增大趋势；人口规模、产业结构、自然资源条件和经济发展水平对提升京津冀城市群绿色水资源利用效率的驱动效应显著，城市开放程度的驱动效果提升较快但尚不稳定，而科技发展水平的驱动作用始终较低且呈减小趋势。

Calculation of green water resources utilization efficiency in Jing-Jin-Ji urban agglomeration and analysis of its spatio-temporal differences and driving factors

Jing-Jin-Ji urban agglomeration is one of the areas with the most severe water shortages in China. Improving the utilization efficiency of green water resources is the only way to solve the contradiction between the supply and demand of water resources and realize the harmonious development of economy, society and ecology. Here, we measured the green water resources utilization efficiency of Jing-Jin-Ji urban agglomeration from 2008 to 2018 and analyzed its spatio-temporal differences using the Super-SBM model, with the consideration of unexpected output. And then the geographic detector model was used to explore the driving factors of green water resources utilization efficiency. The results show that the average utilization efficiency of green water resources did not reach the DEA effective state in Jing-Jin-Ji urban agglomeration, which was in an unstable state with fluctuations, and there was a big gap between the maximum and minimum efficiency of the urban agglomeration. The green water resources utilization efficiency varied greatly in different regions of the agglomeration, which was high in the northern region but low in the southern region, and the difference was increasing. Population size, industrial structure, natural resources and economic development had a significant driving effect on the improvement of the green water resources utilization efficiency in Jing-Jin-Ji urban agglomeration. The driving effect of urban openness had improved rapidly but was not stable; but that of the scientific and technological development level was always low and showed a downward trend.