ABSTRACT
Sulfur cycling has been extensively studied in coastal wetlands and marine ecosystems. Cycling of various forms of sulfur governs many microbial communities that regulate oxidation and reduction reactions. The large inputs of organic matter into wetland soils, along with aerobic and anaerobic zones where sulfur transformation occurs, allow sulfur to play a critical role in the biogeochemistry of wetlands (Figure 11.1). Sulfur is closely linked to the carbon and nitrogen cycle. An important distinction between sulfur and nitrogen cycling is that there is a plenty of sulfate for organisms to utilize. By contrast, the major reservoirs of nitrogen atoms (N2) and carbon atoms (CO2) are gases that must be pulled from the atmosphere.
