基于土地利用覆被变化的城市生境网络时空演变特征及韧性评估OACHSSCD

The construction and maintenance of urban habitat network were an inevitable requirement of ecological civilization,playing a significant role in safeguarding regional ecological security and optimizing territory spatial patterns.A scientific and reasonable assessment of urban habitat network resilience was one of the core issues for cities to cope with and external disturbances,provide long-term ecological services,and enhance human well-being.In this paper,habitat quality was evaluated from the perspective of land use and cover change.Based on MSPA analysis,ecological sources were identified,ecological corridors were extracted,and habitat network patterns were constructed.To assess the resilience of urban habitat networks,a"structural resilience-functional resilience"framework was established,which identified the resilience characteristics and key nodes in the eastern coastal plain's habitat networks.The results showed that:(1)Urban habitat quality changes were closely linked to land cover dynamics.In plain cities,spatial heterogeneity was not significant,with herbaceous vegetation serving as the primary source of converted area and built-up areas acting as the dominant conversion destination.(2)The"source-corridor"integrated urban habitat network emphasized spatial implementation.In this study,nearly 200 ecological sources were identified,with the largest covering 331.87km2 and a total ecological corridor length of 5,411.74km.The ecological corridors in the central study area were relatively dense,facilitating species migration.The systematic construction process fully considered the correlation between source areas and corridors,laying a solid foundation for resilience assessment.(3)A scientific validity of habitat network resilience improvement was assessed from structure and function perspectives.The research demonstrated that resilience assessments of urban habitat networks could provide valuable support for protecting core urban habitats,strengthening connectivity between edge habitats,and establishing well-balanced urban habitat networks.