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Ionic Strength Effects on Acidity and Cations Leached from Forest Floor Cores

Dep. of Plant and Soil Science, Univ. of Vermont, Hills Bldg., Burlington, VT 05405

*Corresponding author.

ABSTRACT

We treated fresh, intact forest floor core samples with three concentrations of artificial acidic precipitation. No differences in leachate pH were found between the acidic and nonacidic treatments at each concentration (30–300 µmol_c L^–1). A linear relationship was found between incoming ionic strength and leachate H⁺, the major cation leached in all treatments. Soil solution extracted in the field was chemically similar to the laboratory leachates. Our findings suggest that the downward movement of acidity in these soils is a function of the ionic strength of incoming leaching water, independent of short-term incoming acidity.

Received for publication March 9, 1992.