Predicting Ionic Distributions in Large Soil Columns
1975
Wierenga, P. J. | Shaffer, M. J. | Gomez, S. P. | O'Connor, G. A.
The distribution of various cations and anions was measured with depth and time in a large lysimeter column periodically irrigated with saline water. Samples of the soil solution were removed with extraction cups placed at depths of 25, 50, 75, 100, 125, and 150 cm below the soil surface in the lysimeters. Observed ionic distributions were compared with calculated values obtained by combining a transient water flow model with a chemical plate theory model. Good agreement was obtained between observed and predicted depth distribution profiles for SO₄²⁻, Cl⁻, Na⁺, and Ca²⁺. Soluble Mg²⁺ and HCO²⁻ concentrations were overpredicted suggesting that further refinement of the chemical subroutine may be needed.
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