Spodosol variability and assessment of response to acidic deposition

Technical Report · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6287538

David, M B; Vance, G F; Fuller, R D; Fernandez, I J; Nodvin, S C

Variability in forest soils makes it difficult to observe short-term changes in chemical properties under field conditions. A buried soil-bag technique was developed to examine the chemical response of a Maine forest soil to loadings of strong acids (HNO3 and H2SO4). Acids were added by irrigation on 18 hardwood plots, 15 by 15 m, American beech (Fagus grandifolia Ehrh.) dominating. Treatments with three replicates each, were control, low S, high S, low N, high N, and N plus S. Soils were typical northeastern Spodosols, with acidic forest floors (pH 3.6) and upper mineral soils (pH 3.4-4.0), low concentrations of base cations in mineral horizons, and enrichment of the spodic horizons with organic C, N, and S. Relative standard deviations (RSD) of horizon means for all chemical properties except pH showed large variability over the small (2.2 h) area encompassed by the plots. Twenty-five 250-micrometers-mesh nylon bags filled with 300 g of homogeneous B horizon soil were placed directly below the forest floor in each plot. After a 1 year of treatment, collection and analysis of three bags per plot showed significant differences. Mean adsorbed SO(-2)4 concentrations were 48 and 92 micrograms S/g in control and high-S treatments, respectively. Exchangeable Ca(2+) and Mg(2+) were greater in the high-S treatment than the control; base saturation increased from 5.9 to 8.5% (possibly due to displacement of cations from the forest floor). The buried soil-bag technique detected small alterations in forest soil chemistry under field conditions, with minimal disturbance to study plots.

• Research Organization: Illinois Univ., Urbana, IL (USA). Dept. of Forestry
• OSTI ID: 6287538
• Report Number(s): PB-91-116798/XAB
• Country of Publication: United States
• Language: English

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Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACID RAIN
ACIDIFICATION
AIR POLLUTION
ATMOSPHERIC PRECIPITATIONS
CHEMICAL ANALYSIS
CHEMICAL PROPERTIES
CHEMISTRY
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DOSE-RESPONSE RELATIONSHIPS
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ENVIRONMENTAL IMPACTS
FORESTS
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INORGANIC ACIDS
MONITORING
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OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POLLUTION
RAIN
SIMULATION
SOIL CHEMISTRY
SOILS
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
VARIATIONS