城市绿地土壤固碳研究进展

Research Progress on Soil Carbon Sequestration in Urban Green Space

城市绿地为城市生态环境健康提供了多种生态系统服务功能,与提升人类福祉和促进城市可持续发展密切相关。城市土壤固碳功能与潜力是全球气候变化背景下城市生态系统碳循环研究的热点问题之一,城市绿地是城市生态系统内唯一具备直接碳汇价值的用地要素,在减缓全球变暖、积极应对气候变化等方面具有不可忽视的作用。绿地土壤碳库数量和质量是衡量城市绿地土壤健康状况的重要内容,直接关系到促进人体健康、维持生物多样性和保持景观游憩等多种城市绿地生态系统服务持续供给。然而,人们对城市绿地在土壤碳库形成和积累过程与机制方面的研究仍处于起步阶段。研究系统整理了城市绿地土壤相关定义及主要特性,总结了绿地土壤碳库空间分布规律及主要影响因子,并梳理了城市绿地土壤碳排放与自然土壤的差别及其潜在机制。重点探讨了城市绿地土壤碳固持特征及其驱动因素,分析了绿地植被、人类活动及时间等因素对城市绿地土壤固碳功能的主要影响。最后提出目前城市绿地土壤固碳研究的局限与不足,并对未来城市绿地土壤固碳的研究方向与热点进行展望,为提升绿地土壤固碳潜力提供科学依据。

Urban green space provides a variety of ecosystem services for urban ecological environment health,which is closely related to improving human well-being and promoting sustainable urban development.The carbon sequestration function and potential of urban soil are one of the hot issues in the study of the carbon cycle of the urban ecosystems under the background of global climate change.Urban green space is the only land element with direct carbon sink value in the urban ecosystem,which plays an important role in mitigating global warming and responding to climate change.The quantity and quality of soil carbon pool is an important content to measure the soil health status of urban green space,which is directly related to promoting human health,maintaining biodiversity,and maintaining the sustainable supply of various urban green space ecosystem services,such as landscape recreation.However,the research on the formation and accumulation process and mechanism of soil carbon pool in urban green space is still in its infancy.This study systematically sorted out the definitions and main characteristics of soil in urban green space,summarized the spatial distribution pattern and main influencing factors of soil carbon pool in urban green space,and sorted out the difference between soil carbon flux in urban green space and natural soil and its potential mechanism.This paper focuses on the characteristics and driving factors of soil carbon sequestration in urban green space and discusses the main effects of vegetation,human activities,and time on soil carbon sequestration in urban green space.Finally,the limitations and shortcomings of current research on soil carbon sequestration in urban green space were put forward,and the future research directions and hot spots of soil carbon sequestration in urban green space have been prospected.It provides the scientific basis for improving the soil carbon sequestration potential of green space.