城市绿心生态系统多功能性及驱动因素研究

[Objective]Rapid urbanization has improved the socioeconomic conditions of people's lives but caused multiple environmental challenges that degrade human well-being and impair urban sustainability.Urban green heart area,an ecological multi-functional space preventing rapidly spreading urbanization,can mitigate challenges through providing key ecosystem services.However,there is still insufficient knowledge of its contribution to sustainable management of multifunctionality in crucial ecosystem services that are closely linked to the living quality of urban dwellers.[Method]Here,we quantified eight ecosystem services and multifunctionality of a large green heart area located at the center of the Changsha-Zhuzhou-Xiangtan urban agglomeration in subtropical China,based on the field inventory data of vegetation and clarify the main factors that affect ecosystem services and multifunctionality.[Result]Forests made substantial contributions to multifunctionality by promoting most ecosystem services,especially evergreen broadleaved forests.Broadleaved forests contributed significantly to net primary production(NPP),urban heat island effect mitigation,and runoff reduction.Coniferous forests promoted the particulate matter(PM2.5)removal rate to reduce air pollution.[Conclusion]Biodiversity and mountainous landscapes were the main factors promoting multifunctionality,thus conserving natural broadleaved forests in mountainous areas and converting planted pure forests in flat areas to mixed conifer-broadleaf forests could improve the urban ecosystem multifunctionality and resilience.