DOI: 10.5593/SGEM2015/B32/S13.033


A. R. Rosca, D.R. Popoviciu, T. Negreanu-Pirjol, M. Fagaras
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 243-248 pp

While conifers are generally considered efficient heavy metal accumulators, little is known about the phytoaccumulation potential of most species. The natural phytoaccumulation potential of three heavy metals (Cu, Zn and Mn) was assessed for three common ornamental Cupressaceae species: Chamaecyparis pisifera, Juniperus horizontalis and Thuja orientalis.
Samples of aboveground organs (branches and leaves), as well as soil samples were taken for each species and analyzed through atomic absorption spectrometry for heavy metal concentration values. The Biological Accumulation Coefficient (BAC) was determined for each plant and metal, to evaluate the phytoaccumulation potential.
Results show, that, considering the widely-accepted minimal thresholds for Cu, Zn and Mn hyperaccumulators, none of the three species fits in this category. The highest average values obtained were 6.7 ppm, for Cu (T. orientalis), 163.2 ppm, for Mn (C. pisifera) and 110.3 ppm, for Zn (T. orientalis).
Average BAC values were all below 1. However, relatively high values were found in T. orientalis (0.6, for Cu) and J. horizontalis (0.64, for Zn).
In conclusion, none of the species analyzed features hyperaccumulator traits on natural, unpolluted soil. Nevertheless, the potential for Cu and Zn accumulation in T. orientalis and J. horizontalis is not negligible and requires further research.

Keywords: phytoaccumulation, Cupressaceae, copper, manganese, zinc

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