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Soil Phosphorus and Vegetation Influence on Wetland Phosphorus Release after Simulated Drought

Louisiana State University, Baton Rouge, LA 70803

View larger version (80K): [in this window] [in a new window]   Fig. 1. The Blue Cypress Marsh Conservation Area, located in east-central Florida, encompasses the headwater region of the St. Johns River.

View larger version (19K): [in this window] [in a new window]   Fig. 2. The total P concentration gradients at the 0- to 10-cm soil layer from the historic nutrient inflow points in the Northeast and Southwest quadrants of the Blue Cypress Marsh Conservation Area (map generated by the St Johns River Water Management District, Palatka, FL). The larger circles indicate higher total P concentrations.

View larger version (31K): [in this window] [in a new window]   Fig. 3. Mean P concentrations for vegetated (n = 4) and non-vegetated treatments (n = 4): (A) P enriched site for soluble reactive P, (B) P unenriched site for soluble reactive P, (C) P enriched site for total P, and (D) P unenriched site for total P. Data shown are mean values and one standard deviation.