Comparative evaluation of the carbon storage capacities in urban stormwater nature-based technologies

Low Impact Development (LID) technologies offer enormous environmental benefits regarding ecosystem services, such as biodiversity support, carbon sequestration, and improved air quality. This study compares and quantifies soil organic carbon (SOC) storage in different LID technologies and investigates the factors affecting carbon storage. It was found that the SOC percentages ranged from 0.8 % to 4.5 % across LID technologies, with the surface constructed wetlands (SCW) and tree box filter exhibiting relatively higher content attributed to root turnover, stormwater runoff, and media composition. Moreover, SCW exhibited the highest SOC content compared to other technologies for the 0-10 cm and 10-20 cm layers. There were linkages identified between the soil's physico chemical properties, but the majority of the correlations were weak to moderate. Among the investigated soil physico chemical characteristics, TN exhibited considerable correlation with SOC content. Additionally, the results from the LID technologies were compared to findings from other studies, which emphasized the role of these technologies in carbon sequestration, green space expansion, and the promotion of environmental sustainability.