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The Effect of Soil-added Cadmium on Several Plant Species¹

ABSTRACT

Several species (Andropogon scopanus, Shus radicans, Rudbeckia hirta, Anemone cylindrica, Monarda fistulosa, Poa pratensis, and Liatris spicata) native to northwestern Indiana were grown from seed in the greenhouse for 6 weeks. An uncontaminated sandy soil was utilized as the substrate with four levels of soil-added Cd. The concentrations added ranged from 0 to 100 µg Cd/g soil and were comparable to surface soil Cd concentration levels found in the urban-industrial region of northwestern Indiana.

Data on germination, survival, height, and dry weight were collected. Germination, survival, and weight were found to exhibit a negative response to increasing soil Cd concentration over all species. Height, however, was not found to be a consistently good indicator of Cd response. While overall species' differences were noted, no differences could be conclusively shown among the species for Cd tolerance, although there were indications that this was the case. All effects noted were of a low level for the soil-added Cd concentrations utilized.

Key Words: urban ecosystems • germination • seedling growth • dry weight

¹ Contribution from Purdue Univ. Agric. Exp. Stn., West Lafayette, IN 47907. AES J. no. 6933. This work was supported by federal funds from the Natl. Sci. Found.-RANN Program.

² Ph.D. Student and Assistant Professor of Forestry, respectively, Dep. of Forestry and Natural Resources, Purdue Univ. First author, now Post Doc., Dept. of Bionucleonic, Purdue Univ.

Received for publication December 23, 1977.