(1) 中国科学院烟台海岸带研究所中国科学院海岸带环境过程与生态修复重点实验室

Salt marshes are coastal wetlands that are considered to be a potential natural source of methane ( CH_4 ). By controlling the production, oxidation, and transport of CH_4 in soils, tidal action drives the episodic and high-magnitude emissions of CH_4 from coastal wetlands. Using the eddy covariance technique, we measured the CH_4 fluxes, environmental factors,and tidal dynamics in a salt marsh in the Yellow River Delta in China. We aimed to investigate the dynamics of CH_4 emissions in the growing season and to analyze the effect of tidal action on CH_4 emission. The results showed that the mean daily methane was 0.063 mg m~(-2) h~(-1),ranging from -0.36 to 0.57 mg m~(-2) h~(-1),during the growing season. Tidal flooding and the wet stage after tides are the significant sources of CH_4. Drying and wetting cycles induced by short-term tides resulted in pulsed CH_4 emissions. Therefore, the soil drought and wetting induced by increasing temperatures and precipitation distribution under climate change will positively impact CH_4 emissions and the carbon cycle in the region.