The 24th IAHR-APD Congress (24th IAHR-APD Congress)

468 / 2024-04-09 13:52:05

Comparative Evaluation of Carbon Stocks in Stromwater Nature - based Technologies

Soil organic carbon, LID technologies¸ nature¬¬- based soltuions, carbon sequestration

Subtheme 5: Climate Change: Adaptation, Mitigation and Resilience > Topic 4: Carbon Peak, Carbon Neutrality under Climate Change

Low Impact Development (LID) technologies offer enormous environmental benefits regarding ecosystem services, such as biodiversity support, carbon sequestration, and improved air quality. Urban stormwater infrastructure, emcompassing elements like urban trees, vegetation gren roof, rain garden, constructed wetland, bioretention, has the full capacity as nature-based solutions to effectively mitigate both direct and indirect carbon emmissions. This study was conducted to quantify and compare the soil organic carbon (SOC) stocks in different LID technologies and landscapes. Moreover, this study aimed to investigate the factors affecting carbon storage. Soil sampling was conducted five times from March 2023 to December 2023. The samples were collected from the inflow and outflow parts of LID technologies at depths of 0-20 cm. On the other hand, landscape soil samples were collected from three distinct depth intervals: 0-20 cm, 20-40 cm, and 40-60 cm. The investigated parameters in this study included pH, moisture content (MC), loss of ignition (LOI), bulk density (BD), electrical conductivity (EC), and total nitrogen (TN). Meanwhile, soil temperature (TEM) was recorded by a portable pocket thermometer during the soil sampling. Furthermore, the SOC content of the soil was quantified using the Walkley-Black method, particularly the wet oxidation method. SOC percentages across LID technologies ranged from 0.8% to 4.5%, with SCW and TBF exhibiting higher content attributed to root turnover, stormwater runoff, and media composition. Among landscapes, LSC1 exhibited the highest SOC, influenced by vegetation management. SCW consistently exhibited the highest SOC in 0-10 cm and 10-20 cm layers, surpassing other technologies influencing by vegetation, stormwater runoff, and facility age. Key findings include negative correlations with soil acidity, positive links with Total Nitrogen (TN), and moisture content influencing SOC dynamics. Temperature variations affect carbon stocks, with warmer temperatures associated with increased microbial activity and SOC decomposition. Additionally, the results from the LID technologies at Kongju National University were compared to other studies that emphasized the contribution of carbon sequestration, green space expansion, and environmental sustainability.