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    Author(s): Marvin Nyborg
    Date: 1976
    Source: In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 791-813
    Publication Series: General Technical Report (GTR)
    Station: Northeastern Research Station
    PDF: View PDF  (950.91 KB)

    Description

    This paper deals with problems of measuring acidity in rainfall and the interpretation of these measurements in terms of effects on the soil-plant system. Theoretical relationships of the carbon-dioxide-bicarbonate equalibria and its effect on rainfall acidity measurements are given. The relationship of a cation-anion balance model of acidity in rainfall to plant nutrient uptake processes is considered. It was concluded that average H+ concentration calculated from pH measurements is not a satisfactory method of determining H+ loading from rainfall unless the rain is consistently acid. Cation-anion balance or titration methods should be more reliable. The flux of H+ ions in soil systems due to plant uptake processes and sulfur and nitrogen cycling is considered. H+ is produced by oxidation of reduced sulfur and nitrogen compounds mineralized during decomposition of organic matter. Plant uptake processes may result in production of either H+ or O H- ions. Fluxes of H+ from these processes are much greater than rainfall H+ inputs, complicating measurement and interpretation of rainfall effects. The soil acidifying potential due to the oxidation of the NH4+ in rainfall is examined, with the conclusion that acidity from this source is of a similar magnitude to direct H+ inputs common in rainfall.

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    Citation

    null 1976. Chemical and biological relationships relevant to the effect of acid rainfall on the soil-plant system. In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 791-813

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