Carbon stock status of urban green space in Suqian City and carbon sink potential of major tree species

¹ Nanjing Forestry University, Nanjing 210037, China
² Suqian Housing and urban-rural Development Bureau, Suqian 223899, China

^* Email：pengsili@njfu.edu.cn

Abstract

【Purpose】Urban green spaces mitigate carbon emissions, boost carbon sinks, and address environmental risks. Analyzing their types, carbon stocks, and key tree species' sequestration capacity aids in improving green space management. This advances the "Carbon Peak, Carbon Neutral" strategy, guiding greening industry development and robust ecosystem construction.【Method】A systematic survey was conducted at representative urban green space sites, establishing observation plots to study species composition and woody plant populations. The carbon sequestration capacity of major tree species was evaluated considering baseline carbon stock and a latitude correction parameter.【Result】The total carbon stock in Suqian's urban green spaces stands at 136,285.47 tons, with regional green spaces contributing the most, followed by parks and protective green spaces, while subsidiaries account for the least. Analysis reveals that the arbor layer is the primary carbon pool, surpassing soil, shrub, and herb layers. Notably, different arbor species exhibit significant variations in carbon sink capacity. There is an obvious difference in the carbon sink capacity of different tree species, and among the 30 major tree species in Suqian City, there is an obvious difference in the carbon sink capacity of different tree species, and there is an obvious difference in the carbon sink capacity of different tree species，Populus adenopoda, Populus × canadensis, Cedrus deodara, Triadica sebifera, Celtis julianae, Celtis sinensis, Liquidambar formosana, Malus spectabilis, Ligustrum lucidum, Acer buergerianum, Osmanthus fragrans, Metasequoia glyptostroboides, Ginkgo bilobaet al. Carbon sink capacity is weaker, and the carbon sink capacity of species will not be insignificantly related to the length of the time interval, but will be affected by the latitudinal zonal space。【Conclusion】 For urban green space management, trees are pivotal, dominating carbon sequestration potential compared to shrubs and herbs. Thus, studying carbon sequestration and oxygen release of tree communities is crucial. Additionally, attention should be given to tree configuration and species selection, prioritizing locally adapted, high-carbon sequestration trees while considering landscape aesthetics and biodiversity conservation, for efficient urban green space management.