Geostatistical Modeling of Soil Phosphorus in the Greater Everglades Ecosystem. (5009)
Authors:
S. Grunwald* - University of Florida
K.R. Reddy - University of Florida, Gainesville, FL T.Z. Osborne - University of Florida, Gainesville, FL
S. Newman - South Florida Water Management District, West Palm
Abstract:
The Greater Everglades ecosystem has been impacted by phosphorus (P) input from adjacent agricultural and urban land uses for many years. A prerequisite to support the ongoing restoration efforts in the Greater Everglades is to characterize current base conditions of the ecosystem in a spatially explicit context. We conducted massive soil sampling at over 1,700 sites spatially distributed throughout the ecosystem in 2003. The optimized spatial sampling designed aimed at
characterizing the short, medium and long-range variability of P and other soil physico-chemical properties. Variography and kriging was used to interpolate point observations and create a map that describes the spatial distribution of soil
phosphorus in the top soil. Total phosphorus values ranged from a maximum of 1,700 mg/kg in Water Conservation Area 2A to values as low as 24 mg/kg in Big Cypress National Preserve. We quantified the variability in impacted and relatively pristine areas using nugget, sill and range. The geographic location, distance from point input sources, vegetation patterns, spatial autocorrelation of P and
cross-correlations between soil properties were given special attention in the interpretation of emerging patterns of soil P within the Greater Everglades.
Speaker Information: Sabine Grunwald, University of Florida, Soil and Water Science Department2169 McCarty HallPO Box 110290, Gainesville, FL 32611; Phone:
352-392-1951 ext 204; E-mail: [email protected]
Session Information: Monday, November 1, 2004, 1:55 PM-3:15 PM Presentation Start: 2:00 PM
Keywords: spatial modeling; spatial variability; kriging; Everglades
