Study on methanotrophs and methane fluxes in municipal solid waste landfills
垃圾填埋场甲烷氧化菌及甲烷通量的研究

The methane fluxes,populations of methanotrophs in landfills cover soil and methane oxidation rates were investigated in different municipal solid waste landfills using enclosed chamber,hungate roll tube method and gas chromatography.The results showed that the methane fluxes ranged from-0.34 to 5.31 mg/(m2·h),populations of methanotrophs ranged from 3.10×107 to 20.77×107 cfu/g dried soil,and the methane oxidation rates ranged from 1.65×10-8 to 4.34×10-8 mol/(h·g) in landfill cover soils.The populations of methanotrophs are positively correlated with the methane oxidation rates,but they are not the determinative factor to the oxidation rates.The more methane fluxes,the higher methanotroph populations and methane oxidation rates,and they are all negatively correlated with the closure time and plants coverage of the landfills.A negative correlation is found between high moisture content of cover soil and methane oxidation rates.No significant correlations are found among pH,organic matter,ammonium nutrition and methane oxidation rates.Raising methane oxidation rates can not only reduce methane emissions from landfills but also oxidize methane in the atmosphere.