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Coastal wetlands have one of the highest carbon sequestration rates among the world’s natural ecosystems mainly because of their high primary productivity and low rate of ecosystem respiration. Meanwhile, they are often assumed to be minor sources of methane (CH₄), a highly potent greenhouse gas (GHG), under the influence of high salinity. On the other hand, frequent inundation and anaerobic environment make coastal wetlands potential sources of CH₄ if other favorable conditions are met. Accurate quantification of the magnitude and direction of biosphere-atmosphere exchange of GHGs, including carbon dioxide (CO₂) and CH₄, is essential for a comprehensive assessment of the climatic impact of coastal wetlands. The eddy covariance technique allows for the direct, quasicontinuous, and long-term measurements of ecosystem-scale GHG fluxes and has been increasingly used in coastal wetland …