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SPODOSOL VARIABILITY AND ASSESSMENT OF RESPONSE TO ACIDIC DEPOSITION
Citation:
David, M., G. Vance, R. Fuller, I. Fernandez, L. Rustad, S. Nodvin, M. Mitchell, AND A. Stam. SPODOSOL VARIABILITY AND ASSESSMENT OF RESPONSE TO ACIDIC DEPOSITION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/187.
Description:
Variability in forest soils makes it difficult to observe short-term changes in chemical properties under field conditions. uried soil-bag technique was developed to examine the chemical response of a Maine forest soil to loadings of strong acids (HNO3 and H2SO4). cids were added by irrigation on 18 hardwood plots, 15 by 15 m, American beech (Fagus grandifolia Ehrh.) dominating. reatments with three replicates each, were control, low S high S, low M, high N, and N plus S. oils were typical northeastern Spodosols with acidic forest floors (pH 3.6) and upper mineral soils (pH 3.4-4.0). ow concentrations of base cations in mineral horizons, and enrichment of the spodic horizons with organic C, N, and S. elative 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. wenty-five 250-um-mesh nylon bags filled with 300 g of homogeneous B horizon soil- were placed directly below the forest floor in each plot. fter a year of treatment, collection and analysis of three bags per plot showed significant differences. ean adsorbed SO2 concentrations were 48 and 92 ug S g-1 in control and high treatments, respectiveLy. xchangeable Ca2+ and Mg2+ 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). he buried soil-bag technique detected small alterations in forest soil-chemistry under field conditions, with minimal disturbance to study plots.