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RECORD NUMBER: 2 OF 156

OLS Field Name OLS Field Data
Main Title Acid Rain and Soil Microbial Activity: Effects and Their Mechanisms.
Author Killham, K. ; Firestone, M. K. ; McColl, J. G. ;
CORP Author California Univ., Berkeley.;Corvallis Environmental Research Lab., OR.
Year Published 1983
Report Number EPA/600/J-83/327;
Stock Number PB86-140530
Additional Subjects Acidity ; Rainfall ; Soil microbiology ; Water pollution ; Forest land ; Exposure ; pH ; Bioassay ; Enzymes ; Respiration ; California ; Reprints ; Acid precipitation ; Forest microbiology
Holdings
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Status
NTIS  PB86-140530 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 7p
Abstract
In the investigation, our aim was to determine if acid rain affects soil microbial activity and to identify possible mechanisms of observed effects. A Sierran forest soil (pH 6.4) planted with Ponderosa pine seedlings was exposed to simulated rain (pH 2.0, 3.0, 4.0 and 5.6) with ionic composition reflecting that found in northern California, corresponding to 15 cm of precipitation over a 12-week period. After exposure, the soils were collected in two samples (top 1 cm and 4 to 5 cm), which were assayed separately for respiration and enzyme activies (urease, phosphatase, dehyrogenase, and arylsulfatase). Changes in microbial activity were most significant in surface soils. Only the pH 2.0 input caused inhibition of both respiration and enzyme activities. (Copyright (c) 1983, ASA, CSSA, SSSA.)