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Soil Science Society of America Journal Abstract - DIVISION S-10-WETLAND SOILS

Phosphorus Loading Effects on Extracellular Enzyme Activity in Everglades Wetland Soils


This article in SSSAJ

  1. Vol. 65 No. 2, p. 588-595
    Received: Jan 3, 2000

    * Corresponding author(s): krr@ufl.edu
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  1. A.L. Wright and
  2. K.R. Reddy *
  1. Wetland Biogeochemistry Lab., Univ. of Florida, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611


The impact of P loading to the northern Florida Everglades has been implicated in changing vegetation patterns, peat accretion rates, and other soil physico-chemical properties. This investigation focused on determining the influence of P loading on the activities of various extracellular enzymes along a P-enrichment gradient and relating measured enzyme activities to soil physico-chemical parameters. Alkaline phosphatase activity (APA) was the only enzyme affected by P loading and was negatively related to soil P concentrations and microbial biomass C and P. Arylsulfatase, β-d-glucosidase, protease, and phenol oxidase were not affected by P loading and were not related to measured soil C, N, S, and P physical and chemical parameters. All enzyme activities were highest in the surface detritus layer and decreased with soil depth. Due to significant relationships between APA and soil and microbial P parameters, APA appears to be a useful indicator for assessing impacts of P enrichment in wetland soils.

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Copyright © 2001. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.65:588–595.