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Phosphorus Flux from Wetland Soils Affected by Long-Term Nutrient Loading

Wetland Biogeochemistry Lab., Soil and Water Science Dep., Univ. of Florida, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611

View larger version (19K): [in a new window]   Fig. 1. Location of study site and experimental locations. Porewater equilibrators were installed and intact soil cores were taken at Stations 1 through 8. Benthic flux chambers were used at Stations 1, 3, and 8. Field-dried soil cores were taken at Stations F1, F4, and U3

View larger version (29K): [in a new window]   Fig. 2. Flowchart depicting the sequence of intact soil core experiments in the greenhouse and the field studies

View larger version (36K): [in a new window]   Fig. 3. Phosphorus flux observed in intact soils cores from WCA-2A under aerobic and anaerobic water column conditions (n = 3). Error bars represent one standard deviation. Time for Experiments I, II, and III: 0 to 10, 10 to 20, and 20 to 56 d, respectively. Note different axis scaling in panels (c) and (d)

View larger version (24K): [in a new window]   Fig. 4. Dissolved oxygen, nitrate, and sulfate consumption rates as a function of distance from the nutrient inflow in WCA-2A as measured during Experiment II. Error bars represent one standard deviation

View larger version (14K): [in a new window]   Fig. 5. Soil oxygen demand measured on surface soils collected at WCA-2A

View larger version (19K): [in a new window]   Fig. 6. Ambient diel changes in pH, dissolved O2, and temperature at Stations 1, 3, and 8 on 16 July 1996 in WCA-2A

View larger version (15K): [in a new window]   Fig. 7. Stoichiometric relationship between oxygen consumption and P mineralization. Data are from intact cores collected from Stations 1 through 4 along the WCA-2A nutrient gradient

View larger version (15K): [in a new window]   Fig. 8. Average soluble phosphorus flux from soil to the overlying water column. Error bars represent standard error