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Phosphorus Sorption Dynamics in Soils and Coupling with Surface and Pore Water in Riverine Wetlands

^a Dep. of Biological Sciences, P.O. Box 369, Univ. of Notre Dame, Notre Dame, IN 46556-0369
^b Natural Resources Research Inst., Univ. of Minnesota, 5013 Miller Trunk Highway, Duluth, MN 55811
^c National Center for Environmental Assessment, U.S. Environmental Protection Agency, 26 W. Martin Luther King Drive, Cincinnati, OH 45268
^d Dep. of Natural Resources, Fernow Hall, Cornell Univ., Ithaca, NY 14853

View larger version (13K): [in a new window]   Fig. 1. Buffer plots used to derive P sorption variables at near-ambient P concentrations. See text for details

View larger version (22K): [in a new window]   Fig. 2. The final SRP concentration (SRPf) relative to the initial amount of P added to solution (SRPi) for 12 sampling points in riverine wetlands at Fond du Lac (FDL) and Pokegama (PK)

View larger version (23K): [in a new window]   Fig. 3. The amount P sorbed per unit dry-weight soil relative to the initial amount of P added to solution for 12 sampling points in riverine wetlands at Fond du Lac (FDL) and Pokegama (PK). Since the highest initial P concentration (32 µmol P L-1) was 10 times higher than the next lowest concentration, the same data are repeated in the bottom panel without this concentration

View larger version (13K): [in a new window]   Fig. 4. Estimated equilibrium P concentration (EPCo) relative to the measured final P concentration for 12 sampling points in riverine wetlands at Fond du Lac (FDL) and Pokegama (PK)

View larger version (27K): [in a new window]   Fig. 5. Phosphorus sorbed relative to the final P concentration in the high-range experiment for 12 sampling points in riverine wetlands at Fond du Lac (FDL) and Pokegama (PK)