Sources of Carbon Dioxide in Soil
All cellular respiration releases energy, water and CO2 from organic carbon compounds. Any respiration that occurs below-ground is considered soil respiration. Respiration by plant roots, bacteria, fungi and soil animals are all sources of 2 to 20 millimeters (0.08 to 0.8 in) in soil.
Read more about this topic: Soil Respiration
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—Henry David Thoreau (1817–1862)