Soil Nutrient Cycling
Sulfur Cycle
As with nitrogen, the atmosphere is an important source of the element sulfur. Sulfur is held largely in the soil organic matter and is subject to microbial oxidation and reduction, and can enter and leave the soil in gaseous forms, and is subject to some degree of leaching in the anionic form. Microbial activities are responsible for many of the transformations that determine the fates of sulfur. Generally, the organic form accounts for most of the soil sulfur with inorganic sulfur forming only a small part of total sulfur in soils. Organic sulfur is subject to mineralization and immobilization, while inorganic sulfur is subject to adsorption, desorption, precipitation, and oxidation–reduction reactions.
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