why soil obsorbs oxygen and othar gases and releases methane and nitrous oxide.
Answers
Answer:
Topp, E. and Pattey, E. 1997. Soils as sources and sinks for atmospheric methane. Can. J. Soil Sci. 77: 167–178. Methane is
considered to be a significant greenhouse gas. Methane is produced in soils as the end product of the anaerobic decomposition of
organic matter. In the absence of oxygen, methane is very stable, but under aerobic conditions it is mineralized to carbon dioxide
by methanotrophic bacteria. Soil methane emissions, primarily from natural wetlands, landfills and rice paddies, are estimated to
represent about half of the annual global methane production. Oxidation of atmospheric methane by well-drained soils accounts
for about 10% of the global methane sink. Whether a soil is a net source or sink for methane depends on the relative rates of
methanogenic and methanotrophic activity. A number of factors including pH, Eh, temperature and moisture content influence
methane transforming bacterial populations and soil fluxes. Several techniques are available for measuring methane fluxes. Flux
estimation is complicated by spatial and temporal variability. Soil management can impact methane transformations. For example, landfilling of organic matter can result in significant methane emissions, whereas some cultural practices such as nitrogen fertilization inhibit methane oxidation by agricultural soils.