Biogeochemistry

  1. Terrestrial Ecosystem Biogeochemistry
    1. Soil Biogeochemistry
      1. Soil Organic Matter
        1. Formation Pathways
          1. Plant Residue Decomposition
            1. Microbial Synthesis
              1. Root Exudation
              2. Chemical Composition
                1. Carbohydrates
                  1. Lignin
                    1. Proteins
                      1. Lipids
                      2. Humic Substances
                        1. Fulvic Acids
                          1. Humic Acids
                            1. Humin
                              1. Molecular Structure
                              2. Soil Organic Matter Dynamics
                                1. Turnover Times
                                  1. Stabilization Mechanisms
                                    1. Priming Effects
                                  2. Soil Nutrient Cycling
                                    1. Nitrogen Dynamics
                                      1. N Mineralization
                                        1. N Immobilization
                                          1. Nitrification
                                            1. Denitrification
                                            2. Phosphorus Dynamics
                                              1. P Mineralization
                                                1. P Sorption
                                                  1. P Availability
                                                  2. Sulfur Dynamics
                                                    1. S Mineralization
                                                      1. S Oxidation
                                                    2. Rhizosphere Processes
                                                      1. Root Architecture
                                                        1. Root Exudates
                                                          1. Organic Acids
                                                            1. Enzymes
                                                              1. Signaling Compounds
                                                              2. Microbial Communities
                                                                1. Bacterial Associations
                                                                  1. Mycorrhizal Fungi
                                                                  2. Nutrient Acquisition
                                                                    1. Direct Uptake
                                                                      1. Microbial Mediation
                                                                  3. Forest Biogeochemistry
                                                                    1. Forest Nutrient Cycling
                                                                      1. Nutrient Inputs
                                                                        1. Atmospheric Deposition
                                                                          1. Weathering
                                                                            1. Nitrogen Fixation
                                                                            2. Internal Cycling
                                                                              1. Litterfall
                                                                                1. Root Turnover
                                                                                  1. Canopy Leaching
                                                                                  2. Nutrient Outputs
                                                                                    1. Leaching
                                                                                      1. Gaseous Losses
                                                                                        1. Harvesting
                                                                                      2. Limiting Factors
                                                                                        1. Nitrogen Limitation
                                                                                          1. Phosphorus Limitation
                                                                                            1. Light Limitation
                                                                                              1. Water Limitation
                                                                                              2. Disturbance Effects
                                                                                                1. Fire Effects
                                                                                                  1. Nutrient Volatilization
                                                                                                    1. Ash Deposition
                                                                                                      1. Soil Heating
                                                                                                      2. Harvesting Effects
                                                                                                        1. Nutrient Removal
                                                                                                          1. Soil Compaction
                                                                                                          2. Insect Outbreaks
                                                                                                            1. Defoliation Effects
                                                                                                              1. Mortality Effects
                                                                                                          3. Grassland Biogeochemistry
                                                                                                            1. Grassland Characteristics
                                                                                                              1. Root:Shoot Ratios
                                                                                                                1. Seasonal Growth Patterns
                                                                                                                  1. Species Composition
                                                                                                                  2. Nutrient Cycling
                                                                                                                    1. Rapid Cycling
                                                                                                                      1. Below-ground Allocation
                                                                                                                        1. Fire Adaptations
                                                                                                                        2. Grazing Effects
                                                                                                                          1. Trampling
                                                                                                                            1. Selective Feeding
                                                                                                                              1. Nutrient Redistribution
                                                                                                                              2. Soil Carbon Storage
                                                                                                                                1. Root Carbon Input
                                                                                                                                  1. Soil Aggregation
                                                                                                                                    1. Protection Mechanisms
                                                                                                                                  2. Wetland Biogeochemistry
                                                                                                                                    1. Wetland Types
                                                                                                                                      1. Freshwater Wetlands
                                                                                                                                        1. Saltwater Wetlands
                                                                                                                                          1. Peatlands
                                                                                                                                          2. Hydrology and Biogeochemistry
                                                                                                                                            1. Water Level Fluctuations
                                                                                                                                              1. Hydroperiod Effects
                                                                                                                                                1. Flow Patterns
                                                                                                                                                2. Redox Processes
                                                                                                                                                  1. Oxygen Depletion
                                                                                                                                                    1. Redox Zonation
                                                                                                                                                      1. Electron Acceptor Sequence
                                                                                                                                                      2. Greenhouse Gas Fluxes
                                                                                                                                                        1. Methane Production
                                                                                                                                                          1. Nitrous Oxide Production
                                                                                                                                                            1. Carbon Dioxide Fluxes
                                                                                                                                                            2. Nutrient Retention
                                                                                                                                                              1. Sediment Trapping
                                                                                                                                                                1. Plant Uptake
                                                                                                                                                                  1. Microbial Processes

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                                                                                                                                                              9. Other Essential Element Cycles

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                                                                                                                                                              11. Aquatic Ecosystem Biogeochemistry