Phosphorus sediment-water interface, fluxe

Phosphorus Fluxes Across the Sediment-Water Interface... 

Reddy, K. R. and M. M. Eisher. 1991. Sediment resuspension effects on phosphorus flux across the sediment-water interface laboratory microcosm studies. In Lake Okeechobee Phosphorus Dynamics Study Biogeochemical Processes in the Sediments. Volume V. Einal Report submitted to South Florida Water Management District (Contract No. 531-M88-0445-A4), West Palm Beach, FL. 

Assuming a bulk density of 1.05 g/cm3 and a dry weight fraction of 0.1 for the interface sediment, 0.38 mm of sediment would supply the observed 160-m water-column burden of resuspended phases, approximately half the basinwide average annual linear sedimentation. The corresponding amount of sediment was consistent with the mass of allochthonous components in the water column during the March-May spring mixing period (200-300 mg/m3). The quantity of resuspended P was calculated as the product of mass of resuspended sediment (g/m2) and phosphorus concentration in surface sediment (mg of P/g). For a 160-m water column, the amount was 48 mg of P/m2 (25 mg of P/m2 for the mean water-column depth of 85 m). The resuspended P flux (25 mg of P/m2) was also obtained from the product of resuspended Al (mg/m2) and the P Al ratio in bottom sediment. 

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