JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 15:399-403 (1986)
© 1986 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Simulated Acid Precipitation on Soil Microbial Activity in a Typic Quartzipsamment1

M. E. Will, D. A. Graetz and B. S. Roof2

ABSTRACT

The 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.

Key Words: acid rain • soil microorganisms • enzyme activity

NOTES

1 Florida Agricultural Experiment Stations Journal Series no. 6690.

2 Graduate Assistant, Associate Professor, and Graduate Assistant, Soil Science Dep., IFAS, Univ. of Florida, Gainesville, FL 32611.

Received for publication August 22, 1985.




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