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Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/3352

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Sirvi Avaldamisel Autor "Cecchin, D." järgi

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    Greenhouse gas emissions in natural and constructed wetland systems
    (Estonian University of Life Sciences, 2026) Rochinha, I. da S. P.; do Carmo, D. de F.; da Silva, F. C.; Jabrasi, Y. D.; Cecchin, D.; Hamacher, L. da S. ; Santiago, A. da F. ; Nogueira, L. A.; Marotta, H.
    Constructed wetlands (CWs) are nature-based technologies that emulate the biogeochemical processes of natural wetlands (NWs) to treat effluents enriched with organic matter and nutrients, such as those from fertilized soils and urban sewage. However, previous evidence from individual ecosystems indicated that constructed wetlands may exhibit substantially increased greenhouse gas (GHG) evasion to the atmosphere compared to natural ones, representing a significant source of greenhouse gas emissions that has not yet been accounted for. This study aimed to evaluate the first global dataset of GHG emissions, encompassing methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O), from natural and constructed freshwater wetlands. Based on an extensive literature search from 1980 to 2020, it was found that median CH4 and N2O emissions were significantly higher in constructed wetlands than in natural wetlands. These emissions reached global medians of ~6.46 ± 5.72 and 0.20 ± 1.30 mg m-2h-1, for CH4 and N2O, respectively, representing a difference of ~517% and 200% compared to natural wetlands. The median CO2 flux in constructed wetlands was ~171.20 ± 57.04 mg m-2h-1 and was not significantly different between the two groups. This indicates that effluent treatment conditions enhance the metabolic production of CH₄ and N₂O, due to intensified organic matter degradation. Furthermore, the dispersion in wetlands for CO2, CH4, and N2O emissions also reflects the substantial spatial variability in GHG emissions. Therefore, sewage treatment efficiency and GHG balance must be considered for planning the design of constructed wetlands.