CS08 Biogeochemical Cycles
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
OsborneTZ, Wetland Biogeochemistry laboratory, University of Florida, Gainesville, FL, USA, osbornet@ufl.edu
Reddy, K, R, Wetland Biogeochemistry laboratory, University of Florida, gainesville, FL, USA, krr@gnv.ifas.ufl.edu
 
LINKAGES BETWEEN VEGETATION AND DISSOLVED ORGANIC MATTER CHARACTERISTICS IN WETLAND ECOSYSTEMS.
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Dominant wetland vegetation types were sampled from selected sites in Florida and coastal Georgia for characterization of live and standing dead (freshly senescent) plant tissue. This organic matter was analyzed for tissue nutrient content (TC,TN,TP), lignin and cellulose content, C13/C12 ratios, and dominant chemical constituents (utilizing FTIR spectroscopy). Abiotic leachates of each of the selected plant species were made from the standing dead biomass samples in the laboratory using a cold water extraction technique. The resulting dissolved organic matter was characterized employing a battery of analyses that included nutrient content (TC,TN,TP), molecular size fractionation, C13/C12 ratios, humic to fulvic acid ratios, FTIR spectroscopy, and microbial utilization. The characteristics of both particulate and dissolved organic matter were investigated for relationships between the different plant species and resulting DOM. With some analyses still pending, results will be presented via poster.