Methane is produced in the sulfate depleted subsurface sediments through two main pathways: a) reduction of CO2 with H2 as the electron donor (hydrogenotrophic methanogenesis; Eq. 7.1), and b) dismutation of acetate (aceticlastic methanogenesis; Eq. 7.2) (e.g., Rudd and Taylor, 1980; Conrad, 2005):

CO2+4 H2CH4+2H2O


In lake sediments, methane production has generally been found to be dominated by aceticlastic methanogenesis, in particular...

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