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Soil nutrient leaching in response to simulated acid rain treatment

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Abstract

Soil and soil solution nutrient concentrations were evaluated over a 30-mo period to determine the impact of simulated acidic precipitation (70:30 equivalent basis H2SO4: HNO3) at pH values of 5.7, 4.5, 4.0, and 3.5 on forest. microcosms. Soil nutrient analysis indicated significantly lower concentrations of exchangeable Ca and Mg in the top 3.5 cm of the mineral soil after 30 mo of pH 3.5 treatment. Leachate collected from the pH 4.5, 4.0, and 3.5 treatments at the 25 cm depth (below the Å.: horizon) exhibited significant increases in Cl, NH4, PO4, K, and SO4 concentrations compared to the pH 5.7 treatment. At the 50 cm depth (mid-profile) all leachate element concentrations except NH4 increased significantly in response to treatment. At the 100 cm depth (profile bottom), no significant effects of treatment on leachate chemistry were observed. The elevated base cation concentration values found in the 50 cm soil solution samples support at least partially the described reduction in Ca and Mg in the surface soil horizon. The 100 cm concentration data indicate that cations mobilized out of the Å.: and upper B horizon in response to treatment were immobilized before reaching the bottom of the soil profile. Evaluation of nutrient flux out of the microcosm at the 100 cm depth did not indicate any statistically significant response to the treatment. Nitrate rather than SO4 was found to be the dominant anion leaving the microcosm by an average factor of ∼7 to 1.

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Kelly, J.M., Strickland, R.C. Soil nutrient leaching in response to simulated acid rain treatment. Water Air Soil Pollut 34, 167–181 (1987). https://doi.org/10.1007/BF00184758

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  • DOI: https://doi.org/10.1007/BF00184758

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