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Response of Biogeochemical Indicators to a Drawdown and Subsequent Reflood

Wetland Biogeochemistry Laboratory, Soil and Water Science Department, University of Florida Institute of Food and Agricultural Sciences, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611

View larger version (82K): [in a new window]   Fig. 1. Geographic location of the Blue Cypress Marsh Conservation Area and approximate position of the sampling sites.

View larger version (67K): [in a new window]   Fig. 2. Experimental setup of a sample core. Reflood was only executed once; the arrow is for illustrative purposes only.

View larger version (20K): [in a new window]   Fig. 3. Soil redox (Eh) profiles over the experimental period (days) as a result of the reflood for the nutrient-enriched northeast site and reference northwest site. The symbols depict the redox potential at three different depths (diamonds represent the soil surface, boxes represent a 5-cm depth, and triangles represent a 10-cm depth).

View larger version (16K): [in a new window]   Fig. 4. Water column dissolved reactive phosphorus (DRP), ammonia (NH4–N), and nitrate (NO3–N) profiles over the experimental period in response to a reflood from below. The symbols depict the nutrient water column concentration for cores obtained at the two sites (boxes represent the nutrient-enriched northeast site and triangles represent the reference northwest site; error bars represent one standard deviation).

View larger version (14K): [in a new window]   Fig. 5. Changes in (a) aerobic and (b) anaerobic microbial respiratory activity and (c) methanogenic activity over the course of the reflood study averaged over the entire soil core. The symbols depict the respective microbial activity for cores obtained at the two sites (boxes represent the nutrient-enriched northeast site and triangles represent the reference northwest site; error bars represent one standard deviation).

View larger version (18K): [in a new window]   Fig. 6. Soil labile organic carbon content (LOC) and microbial biomass carbon (MBC) content two depth intervals over the course of the reflood study. The symbols depict LOC and MBC content for cores obtained at the two sites (boxes represent the nutrient-enriched northeast site and triangles represent the reference northwest site; error bars represent one standard deviation).

View larger version (21K): [in a new window]   Fig. 7. Extracellular enzyme activities associated with the decaying plant material. The symbols depict the enzymatic activity for cores obtained at the two sites (boxes represent the nutrient-enriched northeast site and triangles represent the reference northwest site; error bars represent one standard deviation).

View larger version (21K): [in a new window]   Fig. 8. Changes in levels of extracellular enzyme activities by depth over the reflood period. The symbols depict the enzymatic activity for cores obtained at the two sites (boxes represent the nutrient-enriched northeast site and triangles represent the reference northwest site; error bars represent one standard deviation).