CS08 Biogeochemical Cycles
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
CorstanjeR, Wetland Biogeochemistry Laboratory, Department of Soil and Water Science, University of Florida, Gainesville, USA, Corstanje@mail.ifas.ufl.edu
Portier, K, M, Department of Statistics, University of Florida, Gainesville, USA, KMPortier@mail.ifas.ufl.edu
Reddy, K, R, Wetland Biogeochemistry Laboratory, Department of Soil and Water Science, University of Florida, Gainesville, USA, KRR@mail.ifas.ufl.edu
 
CLUSTER ANALYSIS: DETERMINING THE MOST SENSITIVE BIOGEOCHEMICAL INDICATORS OF NUTRIENT ENRICHMENT IN THE EVERGLADES
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The Northern Everglades is a historically oligotrophic ecosystem that has undergone excessive nutrient loading, resulting in significant ecological perturbation. Water Conservation Area-2A has a nutrient enrichment gradient that radiates out from a point source to the relative pristine marsh interior. Soil cores were taken over a period of approximately five years along that gradient. The soils were characterized in terms of their chemical and microbiological composition, resulting in an extensive biogeochemical database. Of interest was to statistically explore the relationships between the chemical and microbiological characteristics with the final objective to determine which of the microbiological parameters are most sensitive to nutrient enrichment. Cluster analysis was carried out on all variables, subsequent canonical correlates between the variates and clusters were described in terms of the distance from point source. As a result we obtained groups of indicators that we related to spatial and temporal components of the Everglades.