5:15 PM - 6:45 PM
[AHW22-P02] Carbon Dynamics and Sequestration Potential in Subtropical Tidal Constructed Wetland
Keywords:constructed wetland, carbon sequestration, greenhouse gas emission, net zero emission goal
Constructed wetlands offer a variety of ecosystem services and have emerged as prominent ecological engineering practices in recent decades. They play a crucial role as carbon sinks, helping to mitigate the concentration of CO2 in the atmosphere. However, due to the anaerobic soil conditions inherent in wetland ecosystems, they can also be significant sources of greenhouse gases (GHGs), particularly methane (CH4), which possesses a 100-year global warming potential 27 times higher than that of CO2. Understanding the carbon dynamics and quantifying the carbon sequestration potential are essential for assessing the benefits that constructed wetlands can contribute towards achieving the 2050 Net Zero Emission goal.
To address this, a comprehensive study was conducted to examine the carbon dynamics of the Shezidao constructed wetland, which is influenced by tides and located in Taipei City, Taiwan. Samples of water, soil, and plants were collected and analyzed to track changes in carbon content over time. Monthly measurements were taken for greenhouse gas fluxes, including CO2, CH4, and N2O. Additionally, on-site experiments involving a feldspar powder marking method and litter bags were employed to determine exogenous carbon inputs and the transformation of endogenous carbon, respectively.
The findings of this study revealed that greenhouse gas emissions are highest for CO2, followed by CH4, and N2O. When assessed in terms of CO2 equivalent, CH4 contributes to a maximum of 67% of the total greenhouse gas CO2 equivalent. Notably, greenhouse gas flux on exposed mudflats is positive, while on vegetated land, it is negative. When considering the overall carbon balance, encompassing primary productivity, external carbon accumulation, changes in soil carbon content, and greenhouse gas emissions, the Shezidao constructed wetland remains a significant carbon sink.
The findings suggest that tidal constructed wetlands may exhibit high potential for carbon sequestration, positioning them as a viable solution for achieving the 2050 Net Zero Emission target.
To address this, a comprehensive study was conducted to examine the carbon dynamics of the Shezidao constructed wetland, which is influenced by tides and located in Taipei City, Taiwan. Samples of water, soil, and plants were collected and analyzed to track changes in carbon content over time. Monthly measurements were taken for greenhouse gas fluxes, including CO2, CH4, and N2O. Additionally, on-site experiments involving a feldspar powder marking method and litter bags were employed to determine exogenous carbon inputs and the transformation of endogenous carbon, respectively.
The findings of this study revealed that greenhouse gas emissions are highest for CO2, followed by CH4, and N2O. When assessed in terms of CO2 equivalent, CH4 contributes to a maximum of 67% of the total greenhouse gas CO2 equivalent. Notably, greenhouse gas flux on exposed mudflats is positive, while on vegetated land, it is negative. When considering the overall carbon balance, encompassing primary productivity, external carbon accumulation, changes in soil carbon content, and greenhouse gas emissions, the Shezidao constructed wetland remains a significant carbon sink.
The findings suggest that tidal constructed wetlands may exhibit high potential for carbon sequestration, positioning them as a viable solution for achieving the 2050 Net Zero Emission target.