Effects of simulated acid rain on glucose mineralization and some physicochemical properties of forest soils
- Oak Ridge National Lab., TN
To study the effects of acid rain, samples of forest soils were exposed to a continuous application of 100 cm of simulated acid rain (pH 3.2-4.1) at 5 cm/hour, or to intermittent 1-hour applications of 5 cm of simulated acid rain three times per week for 7 weeks. The major effects of the simulated acid rain were localized at the top of the soil and included lower pH values and glucose mineralization rates, and higher exchangeable Al and total and exchange acidity. The acidity penetrated further in the more acid soils. The mineralization of /sup 14/C-glucose was measured at concentrations of 1.5-54 ..mu..g glucose/g of soil. Glucose mineralization in the test soils (pH values of 4.4-7.1) was inhibited by the continuous exposure to simulated acid rain at pH 3.2 but not a pH 4.1. The extent of inhibition depended on the soil and the initial glucose concentration. Exposure of one soil to 7 weeks of intermittent applications of simulated acid rain at pH 3.2 reduced the mineralization rate at the three glucose concentrations tested. These data suggest that acid rain may have a significant impact on microbial activity.
- OSTI ID:
- 5766080
- Journal Information:
- J. Environ. Qual.; (United States), Journal Name: J. Environ. Qual.; (United States) Vol. 10:4; ISSN JEVQA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACID RAIN
AIR POLLUTION
ALDEHYDES
ALUMINIUM
ATMOSPHERIC PRECIPITATIONS
BIOCONVERSION
CARBOHYDRATES
CARBON 14 COMPOUNDS
CHEMICAL PROPERTIES
ELEMENTS
ENVIRONMENTAL EFFECTS
FORESTS
GLUCOSE
HEXOSES
LABELLED COMPOUNDS
METALS
MICROORGANISMS
MINERALIZATION
MONOSACCHARIDES
ORGANIC COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POLLUTION
RAIN
SACCHARIDES
SOILS