Abstract
Abstract Sunflower (Helianthus annuus L. ‘Mammoth’) and poplar (Populus × ‘Androscoggin’ H.) plants were grown in a medium containing one of five Cd concentrations, ranging from 0.13 to 13.20 μg·g−1 and watered with one of five simulated rain treatments (pH 3.2-5.2) to determine the effects of precipitation acidity on Cd mobilization and resulting effects on plant growth. Treatment rain acidity was insufficient to lower the medium solution pH to levels conducive to high Cd desorption. Plants accumulated < 1% of the total Cd applied (as CdCl2) for all Cd treatments. Root and foliar Cd concentrations increased with Cd treatment levels. Poplar accumulated proportionally more Cd in foliage than in roots for all treatments. Sunflower accumulated proportionally more Cd in leaves than in roots for the 0.29, 0.62, and 3.20 μg·g−1 Cd treatments and in roots for the 0.13 and 13.20 μg·g−1 Cd treatments. Cadmium treatments and Cd concentrations in the medium, roots, and foliage were not related to changes in plant dry weights, heights, or essential element concentrations in media, roots, or foliage of either species.
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