Title: Phosphorus release and retention by soils of natural isolated wetlands

Authors: E.J. Dunne, K.R. Reddy, M.W. Clark

Addresses: Department of Soil and Water Science, Wetland Biogeochemistry Laboratory, University of Florida, P.O. Box 110510, Gainesville, FL 32611, USA. ' Department of Soil and Water Science, Wetland Biogeochemistry Laboratory, University of Florida, P.O. Box 110510, Gainesville, FL 32611, USA. ' Department of Soil and Water Science, Wetland Biogeochemistry Laboratory, University of Florida, P.O. Box 110510, Gainesville, FL 32611, USA

Abstract: Hydrological restoration of historically isolated wetlands may mitigate phosphorus (P) loss. The objectives of this study were to quantify P in soil, and to determine the effect of (1) soil characteristics on P release, and (2) antecedent soil hydrological conditions on P dynamics. Humic/fulvic acid bound P and residual P accounted for majority of P (>78%) in surface soils. Soils with highest nutrient status and labile P fractions released most P during initial flooding. Phosphorus dynamics during additional flooding were dependent on soil characteristics, antecedent soil hydrological conditions, and P levels in the water. Phosphorus retention varied between 0.3 and 8 mg m^-2 d^-1.

Keywords: phosphorus release; isolated wetlands; hydrological restoration; soils; flux; phosphorus retention; wetlands; environmental pollution; nutrient loss.

DOI: 10.1504/IJEP.2006.011225

International Journal of Environment and Pollution, 2006 Vol.28 No.3/4, pp.496 - 516

Published online: 06 Nov 2006 *

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