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Phosphorus Loading Effects on Extracellular Enzyme Activity in Everglades Wetland Soils

Wetland Biogeochemistry Lab., Univ. of Florida, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611

View larger version (29K): [in a new window]   Fig. 1. Alkaline phosphatase activity (mg of p-nitrophenol g soil-1 h-1) in detritus and two soil depths along the P gradient in WCA-2A for four sampling times. Error bars represent standard error

View larger version (20K): [in a new window]   Fig. 2. Alkaline phosphatase activity in detritus and two soil depths along the P gradient in WCA-2A expressed as a percentage of maximum APA for each sampling time. Data for each depth represent an average of four sampling times. Error bars represent standard error

View larger version (16K): [in a new window]   Fig. 3. Alkaline phosphatase activity in detritus expressed as a percentage of maximum plotted against bicarbonate-extractable P (NaHCO3–Pi). Data represent an average of the February and August 1996 and March 1997 sampling times. Error bars represent standard error

View larger version (30K): [in a new window]   Fig. 4. Arylsulfatase activity (mg of p-nitrophenol g soil-1 h-1) in detritus and two soil depths at the February, May, and August 1996 sampling times in P-impacted, transitional, and unimpacted areas. Error bars represent standard error

View larger version (28K): [in a new window]   Fig. 5. ß-D-glucosidase (mg of p-nitrophenol g soil-1 h-1) activity in detritus and two soil depths at the February, May, and August 1996 sampling times in P-impacted, transitional, and unimpacted areas. Error bars represent standard error

View larger version (33K): [in a new window]   Fig. 6. Protease activity (mg of tyrosine g soil-1 h-1) in detritus and two soil depths at the May and August 1996 sampling times in P-impacted, transitional, and unimpacted areas. Error bars represent standard error

View larger version (25K): [in a new window]   Fig. 7. Phenol oxidase activity (µmol diqc g-1 min-1) in detritus and two soil depths at the May and August 1996 sampling times in P-impacted, transitional, and unimpacted areas. Error bars represent standard error