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Spatio–Temporal Patterns of Soil Phosphorus Enrichment in Everglades Water Conservation Area 2A

^a Soil and Water Science Dep., 106 Newell Hall, P.O. Box 110510, Univ. of Florida, Gainesville, FL 32611-0510
^b Everglades Dep., Watershed Research and Planning Division, South Florida Water Management District, West Palm Beach, FL 33416-4680

View larger version (35K): [in a new window]   Fig. 1. Location of Water Conservation Area 2A (WCA-2A) in the northern Everglades. The recent extent of encroachment of cattails into the native sawgrass and slough communities is based on the satellite imagery analysis by Rutchey and Vilcheck (1994).

View larger version (20K): [in a new window]   Fig. 2. Results of total P (mg kg-1) analysis of surface soil (0–10 cm depth) sampled at 62 sites in Water Conservation Area 2A (WCA-2A) in 1998.

View larger version (23K): [in a new window]   Fig. 3. Sample variograms for 1990 (DeBusk et al., 1994) and 1998 Water Conservation Area 2A (WCA-2A) soil total P data sets. Both variograms were fit to a spherical model; parameter values are indicated on graphs (A0 = range, in km, of spatial autocorrelation for total P; C0 + C = sill, or maximum semivariance; C0 = nugget semivariance).

View larger version (15K): [in a new window]   Fig. 4. Frequency distribution curves for soil total P concentration in Water Conservation Area 2A (WCA-2A), for both 1990 and 1998 data sets, based on spatially interpolated grid data (N = 4176). Frequency of occurrence is expressed as percent of total land area.

View larger version (51K): [in a new window]   Fig. 5. Spatial distribution of soil total P in Water Conservation Area 2A (WCA-2A), based on spatially interpolated (kriged) data from recent (1998) and 1990 (DeBusk et al., 1994) sampling events. The white areas at the right and bottom of each map represent areas for which data were not collected.

View larger version (56K): [in a new window]   Fig. 6. Probability of soil total P concentration exceeding threshold values of 500, 750, 1000, 1250, and 1500 mg kg-1 in 1998 (current study) vs. 1990 (DeBusk et al., 1994).