Abstract:

Understanding the vegetation characteristics and carbon density of ecological slopes is crucial for selecting appropriate revetment engineering types and vegetation schemes under China's carbon neutrality and peaking goals.This study was conducted to study the vegetation characteristics of the ecological bank protection projects of seven typical sites along three primary urban rivers in Tianjin.Through field surveys,we calculated the carbon storage of vegetation at different revetment forms and locations using biomass and carbon content coefficients,and analyzed the carbon contribution of the slope vegetation.The results indicate that:1) Slope crests,dominated by artificial woodlands with arbor-shrub-grass or arbor-grass communities,serve as the primary carbon storage zones,where carbon density is influenced by plant species,density,community structure,and diversity;2) Slope faces,affected by revetment types,are primarily covered by herbaceous plants,with vegetation type significantly impacting carbon density;3) Slope toes,characterized by naturally growing herbs,show no significant differences in vegetation carbon density across revetment types.There is significant potential for optimization in the selection of high-carbon storage plants and community structures.It is recommended to construct according to high-carbon storage plant community models.By conducting a detailed habitat analysis of the slope surface and appropriately introducing shrubs and vines,significant carbon storage functions can be achieved.The carbon density of the vegetation at the toe of the slope did not show significant differences between different forms.It is recommended to focus on stability and strengthening the connection between aquatic and terrestrial soils at the foot of bank revetment,thus enhancing the overall carbon storage contribution of the slope.

Key words: urban river, ecological revetment, vegetation characteristics, carbon storage