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Emissions of CH4 and N2O from a Wetland in Sanjiang Plain

The seasonal variation and influence factors of emission of greenhouse gasses (CH4 and N2O) from the different water depths were studied during the growing seasons in a marsh wetland of Sanjiang Plain of China. The results showed that the wetland was a source of both CH4 and N2O during the growing seasons and emissions showed conspicuous temporal and spatial variations. Emission rates of CH4 were higher in July and August while N2O were higher in June and July. The highest average CH4 flux among the four sites was in the water depth at 40cm with a rate of 37.00 mg•m-2•h-1 and the lowest was in the water depth at 0cm with a rate of 8.13 mg•m-2•h-1. While the highest average N2O flux was in the water depth at 0cm with a rate of 0.063 mg•m-2•h-1 and the lowest was in the water depth at 60cm with a rate of 0.034 mg•m-2•h-1. Further analysis indicated that water depth at 40cm and the soil temperature at 5cm were the main factors affecting CH4 emission. Water depths at 0 and 40cm were the main factors affecting N2O emission. Air temperature and surface soil temperature were not the main factors affecting CH4 and N2O emissions.