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INDIGENOUS PLANTS AND CHROMIUM IN RHODESIA

H. Wild
Kirkia
Vol. 9, No. 2 (1974), pp. 233-241
Stable URL: http://www.jstor.org/stable/23502019
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
INDIGENOUS PLANTS AND CHROMIUM IN RHODESIA
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Abstract

The chromium bearing soils of Rhodesia when extracted with $2\frac{1}{2}\%$ (by volume) acetic acid reveal less than 2 ppm Cr by atomic absorption spectrophotometer analysis and one would therefore expect that it would be scarcely available to plants. However, on chrome rich soils Rhodesian serpentine species including some serpentine endemics have up to 48 000 ppm in the ashed leaves (e.g. Sutera fodina) as well as large amounts of nickel. Legume species, both endemic and non-endemic to serpentine soils are reported to have active rhizobium nodules on serpentine soils with high chromium and nickel values. Some species accumulate more chrome in their roots than in their stems and leaves, a smaller number accumulated more in stems and/or leaves than in their roots. The same variation occurs with nickel but the situation with this metal does not exactly parallel the behaviour of chrome. Some species with more nickel in their roots than stems or leaves behave in the opposite manner with chrome, some in a similar manner and some species have amounts in stem, leaves and roots which do not greatly differ from each other.

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