Abstract
AbstractThe effects of acid precipitation on microbial and enzyme activities were determined in a field study near Melrose, FL. Three transects of two plots each were irrigated with lake water acidified with 7:3 (v/v) H2SO4/HNO3 to pH 3.0 or 3.6, or with unacidified lakewater (pH 4.6, control) at a rate of 10 cm/week for 20 weeks. The experimental plots were divided into covered and uncovered subplots to determine the effect of excluding natural rainfall (pH 4.6). The application of 200 cm of simulated acid precipitation did not significantly influence soil pH, respiration, or arylsulfatase activity. Phosphatase activity decreased under the pH 3.0 treatment and urease activity was stimulated by the pH 3.6 treatment. The amount of N mineralized over a 12‐week incubation period was lower in soil from the pH 3.0 treatmenthan in soil from the pH 3.6 and 4.6 treatments. After the application of 200 cm of simulated acid rain; soil pH, respiration, and phosphatase activity levels were lower in the plots protected from natural rainfall. Twenty‐four weeks after the last acid application there were no differences in any of the measured parameters between the pH treatments.
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