Regulators of Sulfate Reductions

Presence of electron acceptor with higher reduction potentials Oxygen is toxic to sulfate reducers Sulfate concentration Freshwater ( 0.1 mM) 

Substrate/electron donor Temperature Microbial populations 

The primary regulators of sulfate reduction in wetland soils and sediments are supply of inorganic sulfur (sulfate), presence of oxidants with higher reduction potential, organic matter content of sediment, temperature, and seasonal fluctuation associated with temperature (Table 11.12). 

Sulfur reduction is the major form of microbial respiration in salt marsh sediments. However, it is difficult to estimate with precision what percentage of respiration is mediated by sulfate reduction, since total respiration and aerobic respiration are both poorly known in salt marsh sediments. The estimates on the percentage of total microbial respiration that is mediated by sulfate reduction are based on the comparison of measured rates of sulfate reduction with estimates of inputs and the decomposition of organic matter in these marsh sediments. Unfortunately, the inputs of organic carbon to marsh sediments are not easily measured and not well known. 

Sulfate reduction rates are also controlled by the availability of sulfate and carbon as an energy source. Salt and brackish marsh generally have more sulfate present as compared to the fresh marsh or swamp forest soils due to saline water containing sulfate. Significant sulfate reduction can occur when adequate organic or label carbon is available to support intense reduction or low sediment 

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What are the major regulators of sulfate reduction in wetland soils ... 

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