| The Minjiang River Estuary wetland is one of the most typical estuarine tidal wetlands in southeast seashore of China. Cyperus malaccensis and Phragmites australis (common reed) are the two main native dominant species, and Spartina alterniflora is a alien invasive plant. Methane production from different marshes soil in the Minjiang River Estuary wetland were measured using laboratory incubation. The effects of environmental factors on methane production were discussed. The results showed:(1) The methane production rates reached the maximum on the third day in three kinds of plant marsh soil,then gradually decreased with incubation time. The methane production rates were different from thr three kinds of plant marsh soil:Spartina alterniflora> Phragmites australis> Cyperus malaccensis. The methane production rates were also different from different soil texture, small soil particle-size can support more methane production.(2) Methane oxidation rates were determined during incubation of soil from marshes of the Minjiang River Estuary. About 31.8%-62.4% of the methane production was oxidated.The methane oxidation rate of 0-10 cm soil layer was higher than that of 40-50cm soil layer. Methane oxidation rate and production rate have a significant correlation in the different layers of soil.(3) The methane production by acetate fermentation was up to 60%-70% of 0-10cm soil layer in the three kinds of marshes,40-50cm soil layer only account for 30%.(4) The addition of H2/CO2 did not increase the methane production, the applying of methanol, acetate, methylamine and trimethylamine enhance methane production. The methanol and trimethylamine increased significantly the methane production.(5) The marsh soil temperature was related to the methane production rate within a certain range.The marsh soil salinity and Eh have a negative correlation with the methane production. Also it's helpful to methane produce when the soil pH is close to neutral.
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