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Preprints
https://doi.org/10.5194/egusphere-2023-605
https://doi.org/10.5194/egusphere-2023-605
04 Apr 2023
 | 04 Apr 2023

Driving and limiting factors of CH4 and CO2 emissions from coastal brackish-water wetlands in temperate regions

Emilia Chiapponi, Sonia Silvestri, Denis Zannoni, Marco Antonellini, and Beatrice Maria Sole Giambastiani

Abstract. Coastal wetlands are fundamental for climate-change mitigation thanks to their ability to store large amounts of organic carbon in the soil. They also represent the first natural emitter of methane (CH4). Salinity is known to inhibit CH4 production, but its effect in brackish ecosystems is still poorly understood. Our study aims to understand how environmental variables may affect greenhouse gas emissions (GHGs) in coastal temperate wetlands. We present the results of over one year of measurements performed in four wetlands located along a salinity gradient on the northeast Adriatic coast near Ravenna, Italy. Soil properties were determined by collecting soil samples, while carbon dioxide (CO2) and methane (CH4) fluxes from soils and standing waters, water levels, surface, and groundwater physical-chemical parameters (temperature, pH, electrical conductivity, and sulphate concentrations of water) were monthly monitored by a portable gas flux-meter and multiparametric probes, respectively. Principal component analysis (PCA) was used to investigate emergent relationships between GHGs fluxes and environmental variables. Our results suggest that, among all variables, temperature and irradiance play a significant role in CH4 emissions from water and soil whereas water column depth and salinity are limiting factors of GHGs emissions.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Journal article(s) based on this preprint

03 Jan 2024
Driving and limiting factors of CH4 and CO2 emissions from coastal brackish-water wetlands in temperate regions
Emilia Chiapponi, Sonia Silvestri, Denis Zannoni, Marco Antonellini, and Beatrice M. S. Giambastiani
Biogeosciences, 21, 73–91, https://doi.org/10.5194/bg-21-73-2024,https://doi.org/10.5194/bg-21-73-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Coastal wetlands are important for their ability to store carbon, but they also emit methane, a...
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