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Microbial Enzyme Activities in a Freshwater Marsh after Cessation of Nutrient Loading

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

View larger version (42K): [in a new window]   Fig. 1. Sampling sites within Blue Cypress Marsh Conservation Area for spatial (87 sites) and temporal (6 sites) studies. Stippled area indicates aerial extent of January 2001 fire. Triangles represent spatial study sampling sites; stars indicate the six sites chosen for temporal study. Gray arrows indicate waterflow; white arrows indicate historic inflows of elevated nutrient runoff.

View larger version (31K): [in a new window]   Fig. 2. Comparison of means for acid phosphatase activities (APA) in soil and detritus samples from the three sampling areas and six major vegetation communities in the spatial study. C, Cladium; C-W, Cladium and woody mix; O, others; P, Panicum; T, Typha; and T-W, Typha and woody mix. Values are means of 29 sites from each area, and 18 (C), 10 (C-W), 23 (O), 10 (P), 14 (T), and 12 (T-W) sites from each vegetation class. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples. The line in the body of each box represents the median; top and bottom of the box represent the 75th and 25th quantiles; the lines above and below each box represent the 10th and 90th quantiles.

View larger version (31K): [in a new window]   Fig. 3. Comparison of means for ß-glucosidase activity in soil or detritus samples from the three sampling areas and six major vegetation communities in the spatial study. C, Cladium; C-W, Cladium and woody Mix; O, others; P, Panicum; T, Typha; and T-W, Typha and woody Mix. Values are means of 29 sites from each area, and 18 (C), 10 (C-W), 23 (O), 10 (P), 14 (T), and 12 (T-W) sites from each vegetation class. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples.

View larger version (17K): [in a new window]   Fig. 4. Comparison of means for dehydrogenase activity in detritus samples from the three sampling areas and six major vegetation communities in the spatial study. C, Cladium; C-W, Cladium and woody mix; O, others; P, Panicum; T, Typha; and T-W, Typha and woody mix. Values are means of 29 sites from each area, and 18 (C), 10 (C-W), 23 (O), 10 (P), 14 (T), and 12 (T-W) sites from each vegetation class. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples.

View larger version (40K): [in a new window]   Fig. 5. Comparison of means for acid phosphatase activity in 18 soil and detritus samples from each of the six study sites and bimonthly sampling times in the temporal study. NW-C, northwestern Cladium; NW-P, northwestern Panicum; NE-C, northeastern Cladium; NE-T, northeastern Typha; SW-TCW, southwestern Typha, Cladium, and woody mix; SW-TW, southwestern Typha and woody mix. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples.

View larger version (40K): [in a new window]   Fig. 6. Comparison of means for ß-glucosidase activity in 18 soil and detritus samples from each of the six study sites and bimonthly sampling times in the temporal study. NW-C, northwestern Cladium; NW-P, northwestern Panicum; NE-C, northeastern Cladium; NE-T, northeastern Typha; SW-TCW, southwestern Typha, Cladium, and woody mix; SW-TW, southwestern Typha and woody mix. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples.

View larger version (21K): [in a new window]   Fig. 7. Comparison of means for dehydrogenase activity in soil and detritus for the 18 bimonthly samples in the temporal study. There were no significant differences between sites. Different letters indicate significant differences ( < 0.05). Dashed line indicates mean for all samples.