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Nutrient and Hydrology Effects on Soil Respiration in a Northern Everglades Marsh

W. F. DeBusk{dagger},* and K. R. Reddy

Soil and Water Science Dep., Univ. of Florida, Gainesville, FL 32611-0510



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  		Fig. 1. Site map for the Water Conservation Area 2A (WCA-2A) study area, showing locations of sampling sites in cattail (Typha domingensis Pers.) (T) and sawgrass (Cladium jamaicense Crantz) (C) stands along the north–south gradient of nutrient enrichment. Approximate coverage of sawgrass, mixed sawgrass and cattail, and cattail marsh in WCA-2A are denoted by open, hatched, and shaded areas, respectively.

 


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  		Fig. 2. Profiles of dissolved O2 in the water column, including litter layer, of Everglades microcosms. The solid horizontal lines at depth = 0 represent the approximate location of the soil surface.

 


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  		Fig. 3. Diel measurement of dissolved O2 profiles in Everglades microcosms representing high- and low-nutrient regions of the Water Conservation Area 2A (WCA-2A) marsh. Measurements were taken at six-hour intervals, beginning at midday (1200 h).

 


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  		Fig. 4. Total gaseous C (CO2 + CH4) flux from Everglades microcosms as a function of water level and distance of sample site from the S-10C inflow in Water Conservation Area 2A (WCA-2A).

 




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