Comprehensive governance of the watershed environment is one of the keys to urban and regional development and construction, which will affect not only the overall quality of urban economic development, but also the production and lives of urban residents. Since the economy in the Yangtze River Delta develops rapidly and the water environmental issues is more and more striking, it is in urgent need of moving forward the governance of water environment. This study empirically analyzes the governance efficiency of water environment in the Yangtze River Delta from 2006 to 2017 adopting the methods of the DPSIR (Driving Force-Pressure-State-Impact-Response Analysis model)–TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) and the SNA (Social Network Analysis) to clarify the roles and responsibilities of different cities and main contributors in the governance of water environment. According to the research, the following results are attained: first, due to the effects of pressure and the state subsystem, the Yangtze River Delta’s governance efficiency of water environment has increased steadily over time, from 0.3704 in 2006 to 0.4645 in 2017, but the disparities across cities have further widened. Second, in terms of contributors, the enterprises and governments play the main roles in the governance of water environment in recent years, while the public cannot always exert significant influence owing to unexpected environmental occurrences. Lastly, from the perspective of regional coordinated governance, the Yangtze River Delta resembles a tightly connected network of collaborative governance of water environment, with network connectivity and density growing year after year. However, the network structure of the governance efficiency of water environment in the study area is asymmetric, and network connectivity is higher inside the administrative regions, whereas spatial connectivity across provincial administrative boundaries has to be improved. The research scale and connotation in the field of the governance of water environment can be expanded and deepened through the study on the evaluation of the governance efficiency of water environment in the Yangtze River Delta, and it has considerable practical implications in modernizing the national governance system and capability.

【目的】科学评估国家公园生态系统服务价值和生态风险的时空演变规律和空间关联性，是支撑差异化生态管控与分区修复的重要基础。【方法】本文以三江源国家公园为研究区，基于2000—2020年土地覆被数据，综合应用空间自相关分析、最优带宽地理加权回归、随机森林和最优参数地理探测器等方法，分析不同类型生态系统的变化特征，揭示生态系统服务价值和生态风险的时空演变、空间关联性及驱动机制。【结果】①2000—2020年，研究区不同类型生态系统的面积变化存在显著差异，其中灌木和耕地变化幅度最大（-3.19%和-2.69%），草地变化幅度最小（-0.13%）。②生态系统服务价值整体呈上升趋势，高等级生态系统服务价值区面积降幅最大，减少了2.60%；而较低等级生态系统服务价值区面积增幅最大，增加了1.57%。③生态风险总体呈下降趋势，较高等级生态风险区面积降幅最大，减少了3.05%；中等级生态风险区面积增幅最大，增加了1.42%。④生态系统服务价值与生态风险空间关联密切，可分为高价值-高风险、高价值-低风险、低价值-高风险和低价值-低风险4种聚集类型，高价值-高风险面积减少0.50%，而低价值-高风险、低价值-低风险和高价值-低风险分别增加1.41%、1.11%和0.09%。⑤驱动因素分析表明，人类足迹指数和降水量季节性变化是最主要的单因子驱动变量；NDVI与年平均气温、NDVI与人类足迹指数、铁路道路距离与人类足迹指数的交互作用具有较强解释力；共同揭示了自然过程与人类活动的综合驱动机制。【结论】基于空间关联特征，三江源国家公园可分为生态保护主导区、生态修复主导区和生态保护与修复并重区。针对3类区域的差异及其相互转换情况，可分类制定分区管理、重点区域管控和差异化治理等生态系统保护策略，以助力国家公园生态环境科学保护与修复，更好地发挥其生态功能，推动国家公园高质量和可持续发展。