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Resource: used or used up in processesMethane
Appears in 11 processs and 39 steps. Everything below is linked: open a process to see it in context.
Top processes
- Methane diffuses from the air or deeper soil into gas-filled pores toward oxidising cells
- Methane concentration regime selects the methanotroph guild at the microsite
- High-affinity oxidisers (upland soil clusters, USC-alpha and USC-gamma, and a Methylocystis pMMO2) consume atmospheric methane
- and 8 more in this process
- Methanogenesis starts only after Nitrate, Mn(IV), Fe(III) and Sulfate are depleted, at Eh below about -150 to -200 mV
- Acetoclastic methanogens (Methanosarcina, Methanosaeta) split Acetate into Methane and Carbon dioxide
- Hydrogenotrophic methanogens reduce Carbon dioxide with Hydrogen supplied by syntrophic fermenters (H2 must stay at a few Pa)
- and 4 more in this process
Living soil system
4 stepsSoil gas exchange and redox
3 stepsBacteria and archaea
3 steps- Aerated upland soil oxidises atmospheric Methane with high-affinity methanotrophs
- Methane uptake is limited by diffusion: wet or compacted soil slows uptake, ammonium fertiliser inhibits it
- Nitrous oxide persists about 109 years with 100-year warming potency of about 273 times CO2; methane sink offsets only a little
Show 5 more processes
- Methanogens in saturated peat convert acetate and H2 plus CO2 to Methane; production rises steeply with temperature (activation energy about 0.96 eV)
- Methanotrophs in the oxic surface layer oxidise commonly half or more (20-90%) of the Methane before it escapes
- Plant aerenchyma and bubbles carry Methane past the oxic layer; wetlands emit about 150-180 Tg CH4 per year, the largest natural source
Often found with
Oxygen 19Carbon dioxide 17Methanotrophic bacteria 14Methanogenic archaea 7Atmosphere 5Water 5Nitrous oxide 5Methanotrophs 5Nitrate 4Soil microbes 4Soil pores 3Denitrifying bacteria 3
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