Abstract
Natural populations of woody perennials on lead-mining sites in the Mechernich area of the Eifel Mountains were investigated with respect to soil factors determining the degree and type of heavy metal tolerance. Salix caprea L. (Goat Willow) grew on soils with up to 17000 mg kg−1 total lead (ca. 4000 mg kg−1 ammonium acetate-exchangeable Pb). Betula pendula Roth (Silver Birch) was found on soils containing as much as 29000 mg kg−1 total lead (7000 mg kg−1 ammonium acetate-exchangeable Pb). Other woody perennials, with the exception of the dwarf shrub Calluna vulgaris, were not found in the contaminated area even though they did occur in the immediate vicinity. The two lead-tolerant tree species did not form mixed populations.
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