城市公园绿地植物群落生态效益评估研究OA

As a core component of urban ecosystems,the plant communities in urban park green spaces play a significant role in optimizing urban ecological service functions through evaluating ecological benefits.Taking 4 typical urban park green spaces in Bengbu City as the research objects,29 plots of 20 m×20 m were investigated using the typical quadrat sampling method.The species composition,applica-tion frequency,and structure of the plant communities were analyzed,and the i-Tree model was applied to quantitatively assess the ecological benefits in terms of CO2 absorption,O2 release,air purification,and rainwater interception.The results showed that:(1)A total of 1 185 arbor and shrub plants were recorded in the surveyed communities,belonging to 96 species,69 genera,and 44 families.The arbor and shrub with the highest application frequencies were Osmanthus fragrans(48.28%)and Nandina do-mestica(37.93%).The community structure was predominantly multi-layered(72.41%),with a land-scape feature dominated by evergreen and deciduous coniferous-broadleaved mixed type(44.83%)and evergreen and deciduous broadleaved mixed type(37.93%).(2)The total annual ecological benefit was estimated at 170 066.40 yuan,with the benefit of CO2 absorption accounting for the highest propor-tion(63.5%),followed by O2 release,air purification,and rainwater interception.(3)Large arbor species such as Bischofia polycarpa and Platanus acerifolia have prominent individual plant benefits.Increasing the proportion of native tree species,like Firmiana simplex and Liquidambar formosana,can enhance both ecological benefits and regional characteristics.