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Soil gases (soil atmosphere [1]) are the gases found in the air space between soil components. The spaces between the solid soil particles, if they do not contain water, are filled with air. The primary soil gases are nitrogen, carbon dioxide and oxygen. [2] Oxygen is critical because it allows for respiration of both plant roots and soil ...
The pore space of soil contains the liquid and gas phases of soil, i.e., everything but the solid phase that contains mainly minerals of varying sizes as well as organic compounds. In order to understand porosity better a series of equations have been used to express the quantitative interactions between the three phases of soil.
Entrapment of gas bubbles such as methane [15] produced by methane-producing microorganisms clog the soil pore and contributes to decreasing hydraulic conductivity. As gas is also microbial byproduct, it can also be considered to be bioclogging. Iron bacteria stimulate ferric oxyhydroxide deposition which may cause clogging of soil pores. [16]
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Soil air is relatively moist compared with atmospheric air, and CO 2 concentrations tend to be higher, while O 2 is usually quite a bit lower. O 2 levels are higher in well-aerated soils, which also have higher levels of CH 4 and N 2 O than atmospheric air.
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