Biogeochemistry-4 Nitrogen

Biogeochemistry-4 Nitrogen - Nitrogen Cycling in wetlands...

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Unformatted text preview: Nitrogen Cycling in wetlands Nitrogen Cycling in wetlands AEROBIC AEROBIC ANAEROBIC Organic N Plant uptake Adsorbed NH 4 + NO 3- Litterfall Denitrification Peat accretion Organic N Nitrification Mineralization . Plant biomass N Plant biomass N [NH 4 + ] s NH 4 + [NH 4 + ] s NH 4 + NO 3- N N 2 , N 2 O (g) N 2 , N 2 O (g) Microbial Biomass N NH 3 Volatilization N 2 Nitrogen Fixation Reservoirs of Nitrogen Reservoirs of Nitrogen Lithosphere 163,600 x 10 6 Tg Atmosphere 3,860 x 10 6 Tg Hydrosphere 23 x 10 6 Tg Biosphere 0.28 x 10 6 Tg 1 Tg = terrogram = 10 12 g Forms of Nitrogen Forms of Nitrogen Organic Nitrogen Proteins Amino Sugars Nucleic Acids Urea Inorganic Nitrogen Ammonium N Nitrate N (NO 3-N) Nitrite N (NO 2-N) Nitrous oxide (N 2 O N) Dinitrogen (N 2 ) Nitrogen Cycling in wetlands Nitrogen Cycling in wetlands AEROBIC AEROBIC ANAEROBIC Organic N Plant uptake Adsorbed NH 4 + NO 3- Litterfall Denitrification Peat accretion Organic N Nitrification Mineralization Mineralization . Plant biomass N Plant biomass N [NH 4 + ] s NH 4 + [NH 4 + ] s NH 4 + NO 3- N N 2 , N 2 O (g) N 2 , N 2 O (g) Microbial Biomass N NH 3 Volatilization N 2 Nitrogen Fixation Mineralization Mineralization Ammonification Ammonification [Mineralization] Organic N Ammonium N [Breakdown of Organic Matter] Immobilization Immobilization Inorganic N (NH 4-N and NO 3-N) Organic N [Buildup of Organic Matter] Regulators of Regulators of Ammonification Ammonification Substrate quality C/N ratio of the substrate Extracellular enzyme activity Supply of electron acceptors Temperature pH Redox conditions Nitrogen Cycling in wetlands Nitrogen Cycling in wetlands AEROBIC AEROBIC ANAEROBIC Organic N Plant uptake Adsorbed NH 4 + NO 3- Litterfall Denitrification Peat accretion Organic N Nitrification Mineralization ....
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Biogeochemistry-4 Nitrogen - Nitrogen Cycling in wetlands...

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