The previous sections have discussed biogeochemical pathways, rates, regulation and microbiology of the sulfur cycle. I will here focus on some quantitative aspects of microbial sulfate reduction in marine sediments, from the regional to the global scale.
The primary control on sulfate reduction in marine sediments is the rain rate of particulate organic matter (POC) from the water column to the seafloor. This flux of organic matter feeds the aerobic respiration by all the benthic fauna and microorganisms. It also feeds the anaerobic processes in the sediment and affects their mutual zonation and rates. By data compilation and modelling of...
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