我国海洋生态效率时空演变特征及影响因素OACHSSCD

Exploring the spatiotemporal evolution characteristics and improvement paths of marine ecological efficiency(MEE)is of great significance for advancing high-quality marine development,promoting the coordinated development of marine resources utilization and ecological protection,and solidifying the foundation for building a maritime power.Based on panel data of 52 coastal prefecture-level cities in China from 2008 to 2022,this study employs the undesirable super-efficiency SBM model to accurately measure MEE levels,uses kernel density estimation to reveal dynamic temporal evolution characteristics,and applies the Tobit model to empirically test the action mechanisms of influencing factors,comprehensively examining the spatiotemporal evolution patterns and driving factors of MEE.The results indicate that:(1)From 2008 to 2022,China's average MEE showed a U-shaped trend of first declining and then rising-declining in the early stage due to extensive marine economic development and over-exploitation of resources,and recovering in the later period driven by ecological protection policies and green industrial transformation.In 2022,cities with high MEE accounted for 34.62％,representing a 17.31 percentage point increase from 17.31％in 2008.(2)The overall spatial distribution of MEE exhibited obvious north-south disparity,with generally lower levels in northern coastal cities and higher levels in southern coastal cities.Regional disparities first widened due to differences in development models and resource endowments,then narrowed with the advancement of regional collaborative governance.Moran's I test showed significant positive spatial autocorrelation in most years,with low-value agglomerations concentrated in the northern marine economic circle and high-value agglomerations in the eastern and southern marine economic circles.(3)The relationship between marine economic development level and MEE conforms to the Environmental Kuznets Curve:MEE decreases in the initial stage of extensive development,and after the marine economic contribution rate reaches the inflection point of 41.8％,MEE improves continuously driven by high-quality economic development and technological innovation.(4)The per unit area value of marine carbon sequestration services positively promotes MEE by optimizing the marine ecological structure,while environmental regulation exerts a significant positive impact by restricting pollution emissions-this effect is more pronounced in developed regions with higher policy execution efficiency.In contrast,industrial structure upgrading and the degree of opening-up have a significant short-term negative impact on MEE.In the future,efforts should focus on accelerating the green transformation of traditional marine industries,constructing a gradient environmental regulation system tailored to regional development levels,and implementing differentiated governance strategies based on the resource endowments of different marine economic circles,so as to realize the harmonious coexistence of marine ecosystems and human activities.