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AEROBIC MINERALIZATION

BEAM Annual Meeting . 26 th November 2012. N 2. n itrogen fixation. Primary Producers. NH 4 +. PO 4 3-. Water Column. sedimentation. H 4 SiO 4. N 2. AEROBIC MINERALIZATION. NH 4 +. NO 3 -. NH 4 +. nitrification. PO 4 3-. Sediment. H 4 SiO 4. denitrification.

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AEROBIC MINERALIZATION

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  1. BEAM Annual Meeting 26th November 2012 N2 nitrogen fixation Primary Producers NH4+ PO43- Water Column sedimentation H4SiO4 N2 AEROBIC MINERALIZATION NH4+ NO3- NH4+ nitrification PO43- Sediment H4SiO4 denitrification ANEROBIC MINERALIZATION

  2. BEAM Ecosystem Functioning cluster ISABELL N2 nitrogen fixation BARBARA STEFANO NH4+ PO43- sedimentation H4SiO4 N2 AEROBIC MINERALIZATION NH4+ NO3- NH4+ nitrification PO43- H4SiO4 denitrification ANEROBIC MINERALIZATION

  3. Uptake of NH4+tracer by < 5 µm fraction N2 NH4+ 20% 12C:14N 15N:14N (Photo: B. Bergman) 0.0037 0.02

  4. O2 NH4+ Sediment traps Particle camera NH4+/O2 fluxes 1 cm

  5. Nutrient exchanges between sediment and water in Himmerfjärden • ~25 stations wereselectedcovering a vastrange of sediment types (e.g., sand, mud, clay, etc.) BBL profiler 27 • - O2uptake from sediment • Nutrients and oxygen concentration in the BBL • --> Fluxes of nutrients and O2 between sediment and water

  6. Nitrogen cycling along Himmerfjärden: regulation and patterns Denitrification rates and fluxes of DIN were measured in the four seasons, at four stations • Annual nitrogen budgets for the four sampling sites • ~230 t N yr-1 discharged by the STP and ~221 t N yr-1 removed by denitrification (and anammox) • -> Estuarine sediments as major N sink

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