Degradation effects of soil pollution by acid rains and heavy metals Natural acidity intensification The acid rains, resulted by sulfur oxides transformation into acids, especially sulfuric acid, besides causing leaf burns, contribute to the acidity increase of naturally acid soils and to lowering the buffering capacity of base saturated topsoils As a result, Dystric Cambisols and Haplic Luvisols presented the lowest pHH20 values(3.6-3.9). The difference in pH values of these soils reaches up to 1-2 pH units, comparing polluted and non-polluted areas. The difference is very small, only 0.1-0.3 pH units for Eutric Cambisols,
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