The Biogeochemical Sulfur Cycle of Marine Sediments
By B. Jørgensen, A. Findlay, André Pellerin. Frontiers in Microbiology, 2019
607 citations recorded by the source corpus.
Microbial dissimilatory sulfate reduction to sulfide is a predominant terminal pathway of organic matter mineralization in the anoxic seabed. Chemical or microbial oxidation of the produced sulfide establishes a complex network of pathways in the sulfur cycle, leading to intermediate sulfur species and partly back to sulfate. The intermediates include elemental sulfur, polysulfides, thiosulfate, and sulfite, which are all substrates for further microbial oxidation, reduction or disproportionation. New microbiological discoveries, such as long-distance electron transfer through sulfide oxidizing cable bacteria, add to the complexity. Isotope exchange reactions play an important role for the stable isotope geochemistry and for the experimental study of sulfur transformations using radiotracers. Microbially catalyzed processes are partly reversible whereby the back-reaction affects our interpretation of radiotracer experiments and provides a mechanism for isotope fractionation. We here review the progress and current status in our understanding of the sulfur cycle in the seabed with respect to its microbial ecology, biogeochemistry, and isotope geochemistry.
Subfields: Environmental Chemistry, Oceanography
View Paper: https://www.semanticscholar.org/paper/c0773f7079ee986cc2536d7430364f7a051d0a91
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Citations in the corpus
- SCycDB: A curated functional gene database for metagenomic profiling of sulphur cycling pathways (2020, background): “For instance, higher abundances of S reduction gene families and microorganisms in marine sediments were observed, probably linked to the importance of anaerobic respiration with S compounds as electron acceptors in the marine sediment (Jørgensen et al., 2019; Wasmund et al., 2017).”