Biogeochemistry

  1. The Global Sulfur Cycle
    1. Sulfur Reservoirs
      1. Oceanic Sulfur
        1. Sulfate Ions
          1. Dissolved Organic Sulfur
            1. Particulate Sulfur
            2. Atmospheric Sulfur
              1. Sulfur Dioxide
                1. Hydrogen Sulfide
                  1. Dimethyl Sulfide
                    1. Sulfate Aerosols
                      1. Organic Sulfur Compounds
                      2. Terrestrial Sulfur
                        1. Soil Sulfur
                          1. Organic Sulfur
                            1. Sulfate
                              1. Sulfide Minerals
                              2. Plant Sulfur
                                1. Microbial Sulfur
                                2. Geological Sulfur
                                  1. Pyrite and Pyrrhotite
                                    1. Gypsum and Anhydrite
                                      1. Sulfur Deposits
                                    2. Sulfur Transformations
                                      1. Sulfate Reduction
                                        1. Assimilatory Reduction
                                          1. Dissimilatory Reduction
                                            1. Sulfate-reducing Bacteria
                                              1. Environmental Controls
                                              2. Sulfur Oxidation
                                                1. Sulfide Oxidation
                                                  1. Chemical Oxidation
                                                    1. Biological Oxidation
                                                    2. Sulfur-oxidizing Bacteria
                                                      1. Chemolithotrophic Processes
                                                      2. Organic Sulfur Cycling
                                                        1. Sulfur Amino Acids
                                                          1. Sulfonates
                                                            1. Sulfate Esters
                                                            2. Atmospheric Sulfur Chemistry
                                                              1. DMS Oxidation
                                                                1. SO2 Oxidation
                                                                  1. Aerosol Formation
                                                                    1. Cloud Condensation Nuclei
                                                                    2. Geological Processes
                                                                      1. Volcanic Emissions
                                                                        1. Hydrothermal Systems
                                                                          1. Weathering of Sulfide Minerals

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                                                                      9. Other Essential Element Cycles