Lysimeter study of effects of acid deposition on properties and leaching of gleyed dystric brunisolic soil in Norway
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Abstract
The effects of artificial rain of various acidities were studied in a lysimeter experiment. Lysimeters, 29 cm in diameter, and 40 cm deep contained a Gleyed Dystric Brunisol. Natural structure, stratification and original vegetation were maintained. Artificial rain was produced from groundwater with “high” concentrations of neutral salts and from rainwater with lower concentrations. pH levels of 6, 4, 3 and 2 were established by adding H2SO4. Effects of dilution with given amounts of acid were examined by comparing the effects of 50 mm “rain” month−1 of pH 3 and pH 2 with 500 mm “rain” month−1 of pH 4 and pH 3, respectively. The study continued for 5 yr. Totals of 1250 or 12500 mm “rain” were applied in addition to a natural input of 2773 mm. Increased input of SO42− increased the output of SO42− but, as concentration increased, sorption of SO42− in the soil also increased. Concentrations of base cations in the leachate increased parallel to the output of SO42−. However, significant effects on leaching of base cations and on the content of exchangeable cations in the soil, was only found in the pH 2 treatment with 1250 mm of “rain” and in the pH 4 and pH 3 treatment with 12500 mm of “rain”.
Keywords
Acidity Stratification H2SO4 Leaching SO42Preview
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