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Modeling Soil Sulfate Sorption Characteristics

Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0915;

R.P. Dick^* and J. Baham

Dep. of Crop and Soil Science, Strand Agric. Hall 202, Oregon State Univ., Corvallis, OR 97331-2213.

^* Corresponding author.

ABSTRACT

Knowledge of soil SO₄ adsorption characteristics is required for predicting the fate of atmospheric S depositions on terrestrial ecosystems. This study developed two models for predicting the SO₄ sorption characteristics of field moist soils from routinely measured soil physical and chemical properties. Sixty-two soil samples from the U.S. Northeastern (NE) and Southern Blue Ridge Province (SBRP) regions were used in model development. The first modeling approach used stepwise multiple regression to identify which combinations of soil properties best predicted each Langmuir constant. The Langmuir constant regression equations were then substituted back into the Langmuir model and used to predict SO₄ sorption for each equilibrium SO₄ concentration. This approach described SO₄ sorption reasonably well for both regions (R² of 0.57–0.89). In the second approach, a better fit of SO₄ sorption was achieved (R² of 0.81–0.92) using fewer soil properties by expressing the Langmuir constants as linear functions of selected soil properties and directly estimating the soil property coefficients by nonlinear regression. Soil properties used in the second model included: dithionite-citrate-extractable Al (Al_d), total organic C (TOC), and extractable SO₄ for the NE region; and Al_d, TOC, clay content, pH, and CEC for the SBRP region. These results indicated that regional soil SO₄ sorption characteristics could be predicted for field moist soils with the knowledge of only a few routinely measured soil properties.

Oregon State Univ. Agric. Exp. Stn. Tech. Pap. 9518. Although the research reported in this article has been supported by the USEPA through assistant agreement CR-815370-0101 to Oregon State Univ., it has not been subjected to the Agency review and therefore does not necessarily reflect the views of the Agency and no official endorsement should be inferred.

Received for publication March 11, 1991.