The Production and Fate of Reduced C, N, and S Gases from Oxygen-deficient Environments
The oxygen-deficient environments comprise the subsurface parts of soils, lake sediments, and the sea bed, and they penetrate into the bottom layers of some stratified water bodies. Organic matter is here decomposed mainly by microorganisms which release metabolic products containing carbon, nitrogen, and sulfur. Among the gaseous products considered here are CH4, NH3, N2O, NO, H2S, (CH3) SH, (CH3)2S, CS2, OCS, and H2. As most of these trace gases are very useful as nutrients for the biosphere, their emission into the atmosphere is regulated both by biological and by physical mechanisms. The actual emission rates are discussed in view of quantitative flux data as well as regulating factors.
KeywordsPaddy Field Atmospheric Methane Bacterial Sulfate Reduction Flux Chamber Biogenic Source
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