Greenhouse gas emissions from stormwater bioretention basins

Bioretention basins are frequently subjected to anaerobic conditions, which can create an optimum environment for microbial activities remove nitrogen (N) and sequester carbon (C) in the below-ground filter media. However, these biological processes associated with potential production of greenhouse gas (GHG) emissions that need be measured. In this study, we quantified nitrous oxide (N 2 O), methane (CH 4 ) dioxide (CO fluxes from soil under a transition period dry wet conditions subtropical Australia. The GHG were measured on bed slow (wet basin) fast (dry draining their embankment area. addition, influence Carex appressa plant was investigated. Finally, denitrification basin C N accumulation (over 18-month interval) soils both slight sinks CH (?16 ? ?g m ?2 h ?1 while being high source CO (> 520 × 10 3 ). comparison, mean value 123× 2405 , respectively. O positively driven by precipitation. presence C. increased consumption generation. results suggest adopting slow-draining design bioretention systems, such as lowering hydraulic conductivity and/or provision saturation zone higher profile, reduce potentially improve water quality performance basins. increase should expected by-product. Greenhouse (?g area condition. • Dry areas but large . Slow fluxes. emissions. rainfall production.