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TECHNICAL REPORTS

Wetlands and Aquatic Processes

Assessment of the Spatial Distribution of Soil Properties in a Northern Everglades Marsh

^a GIS Research Laboratory
^b Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida-Institute of Food and Agricultural Sciences, 2169 McCarty Hall, PO Box 110290, Gainesville, FL 32611-0510
^c Everglades Department, South Florida Water Management District, P.O. Box 24680, West Palm Beach, FL 33416-4680

^* Corresponding author (SGrunwald{at}ifas.ufl.edu)

Received for publication June 23, 2005. Florida Everglades restoration plans are aimed at maintaining and restoring characteristic landscape features such as soil, vegetation, and hydrologic patterns. This study presents the results from an exhaustive spatial sampling of key soil properties in Water Conservation Area 1 (WCA 1), which is part of the northern Everglades. Three soil strata were sampled: floc, upper 0- to 10-cm soil layer, and 10- to 20-cm soil layer. A variety of properties were measured including bulk density (BD), loss on ignition (LOI), total phosphorus (TP), total inorganic phosphorus (TIP), total nitrogen (TN), total carbon (TC), total iron (TFe), total magnesium (TMg), total aluminum (TAl), and total calcium (TCa). Interpolated maps and model prediction uncertainties of properties were generated using geostatistical methods. We found that the uncertainty associated with spatial predictions of floc, particularly floc BD, was highest, whereas spatial predictions of soil chemical properties such as soil Ca were more accurate. The resultant spatial patterns for these soil properties identified three predominant features in WCA 1: (i) a north to south gradient in soil properties associated with the predominant hydrological gradient, (ii) areas of considerable soil nutrient enrichment along the western canal of WCA 1, and (iii) areas of considerable Fe enrichment along the eastern canal. By using geostatistical techniques we were able to describe the spatial dynamics of soil variables and express these predictions with an acceptable level of uncertainty.

Abbreviations: BD, bulk density • LNWR, Loxahatchee National Wildlife Refuge • LOI, loss on ignition • TAl, total aluminum • TC, total carbon • TCa, total calcium • TFe, total iron • TIP, total inorganic phosphorus • TMg, total magnesium • TN, total nitrogen • TP, total phosphorus • WCA, Water Conservation Area

This article has been cited by other articles:

				S. Grunwald and K. R. Reddy Spatial Behavior of Phosphorus and Nitrogen in a Subtropical Wetland Soil Sci. Soc. Am. J., June 18, 2008; 72(4): 1174 - 1183. [Abstract] [Full Text] [PDF]