重庆市鸿恩寺公园绿地生态系统固碳效益分析OA

The carbon sequestration benefits and ecological value of urban park green spaces are of critical importance for enhancing ecosystem service functions in cities.This study focused on Hongensi Park in Chongqing.Based on 60 plots(20 m×20 m)established across six sample areas(S1,S2,…,S6),field measurements of diameter at breast height(DBH),tree height,species composition,and individual abundance were collected.By integrating relative biomass al-lometric equations with carbon conversion coefficients,we systematically estimated biomass,carbon sequestration,and associated economic benefits for plant species within the tree,shrub,and herb layers,and further examined plot-scale variability.The results showed that the plant community in Hongensi Park comprised 54 species.The tree layer domi-nated the carbon sequestration function,with a biomass of 1.22×106 kg(92.14%of the total)and an annual carbon se-questration benefit of 2.31×104 CNY(90.52%of the total benefit).Osmanthus fragrans and Ginkgo biloba were the dominant tree species,whereas Nandina domestica and Photinia×fraseri were the dominant shrubs.Although the herb layer contributed less than 2%of total biomass,its carbon sequestration efficiency reached 50%.Carbon sequestration benefits exhibited pronounced spatial heterogeneity among plots,driven jointly by soil conditions,community composi-tion,and individual traits;notably,S5 achieved the highest carbon sink benefit per unit area.Overall,the carbon sink function of urban parks is highly sensitive to the structural characteristics and growth status of the tree layer.On the premise of conserving dominant large-diameter trees and improving stand regeneration structure,optimizing the tree-shrub-herb configuration and implementing supplementary planting are expected to enhance the carbon sink potential of urban green spaces and related ecosystem service efficiency.These findings provide a theoretical basis for improving car-bon sink functions in urban parks and for achieving synergistic gains with biodiversity conservation.