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Lead Uptake by Selected Tree Seedlings¹

ABSTRACT

Most of the numerous investigations concerning Pb in the environment have dealt with the Pb concentrations in various environmental components. These investigations have failed to describe the movement of Pb in the environment and factors influencing this movement. Several sources including soil, water, and air give rise to Pb in plants. Soil as a source of Pb is the concern of this study.

The experiment was a completely random design in a factorial arrangement with eight tree species, five soil Pb levels (0 to 600 ppm), three soil types, and two phosphate levels (0 to 336 kg/ha) replicated three times.

Results indicate statistically significant levels of Pb in the leaves, stems, and roots of all eight tree species with all treatment combinations except the control. Uptake was significantly affected by soil Pb concentration with higher uptakes associated with higher soil Pb levels. Lead uptake by plants was reduced by approximately half when high levels of soil P were present. Other soil factors had no significant effects on Pb uptake in the study.

Key Words: heavy metals • pollution • phosphorus

¹ Contribution from the Dept. of Forestry, University of Illinois, Urbana. 61801.

² Assistant Professor of Forestry.

Received for publication April 10, 1972.