South African Journal of Science
On-line version ISSN 1996-7489
Print version ISSN 0038-2353
NKOANE, Bonang B.M. et al. Examination of Blepharis aspera as a possible Cu-Ni indicator plant. S. Afr. j. sci. [online]. 2007, vol.103, n.9-10, pp.363-364. ISSN 1996-7489.
BLEPHARIS ASPERA WAS COLLECTED FROM A copper-nickel mineralized area in Botswana and examined as a possible Cu-Ni indicator plant for biogeochemical prospecting. Different plant parts and the host soils were analysed using ultrasonic slurry sampling electrothermal atomic absorption spectrometry. All plant parts accumulated Cu and Ni in above-normal amounts, although not in hyperaccumulator concentrations. The leaf to soil concentration ratio varied little with metal concentration in the soil. We propose Blepharis aspera as a Cu indicator plant. The accumulation behaviour of Blepharis aspera is compared with another previously studied metallophyte, Helichrysum candolleanum, that is growing in the same area.