DBPapers
DOI: 10.5593/SGEM2014/B52/S20.018

COMPARATIVE EVALUATION OF ABSORPTION CAPACITY FOR SOME HEAVY METALS BY TWO ARBOREAL LICHENS SPECIES GROWING ON SPRUCE AT DIFFERENT ALTITUDE IN BUCEGI MOUNTAINS

G. Busuioc, I. Dumitru, O. Badea, C. C. Elekes, C. Stihi, I. David
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-18-6 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 2, 131-138 pp

ABSTRACT
This work is about the characteristics of absorption and storage of some heavy metals by two arboreal lichens species which are dominant on spruce bark in National Park Bucegi area, at different altitude. The great problem is that the spruce exemplars massively covered by dominant lichens thallus are drying in time. The main task of our work is to find any correlation between accumulation of heavy metal species, lichen species and altitude. So, were taken in study two dominant epiphyte lichens species Evernia divaricata and Parmelia tubulosa. Evernia divaricata could be found at four altitude, 900 m, 1200 m, 1500 m and 1800 m developing a great quantity of biomass, covering massively the bark of many spruce exemplars and Parmelia tubulosa was found only from 1200 m to 1800 m altitude. Lichens thallus and spruce bark were analyzed by Energy Dispersive X-Ray spectrometry. The results are calculated in ppm, the sensitivity of EDXRF method is of 1 ppm. By this method were determinate iron, titanium, nickel, chromium, copper, zinc, manganese, strontium and lead. For every result were considered minimum 3 and maximum 5 samples of thallus or spruce bark for each altitude and each arboreal lichens species, from case to case. The analysis show that the highest metal content in thallus was for iron comparatively with the other heavy metals determined, in all samples at both lichens species studied, no matter the altitude. Iron content in Evernia divaricata thallus was between a minimum of 162.97 ppm in samples collected from 1200 m altitude and maximum of 650.60 ppm in those harvested from 1500 m altitude. In case of samples of Parmelia tubulosa iron content was between a minimum of 266.603 ppm in thallus collected from 1500 m altitude and a maximum of 1711.54 ppm in samples harvested from 1800 m altitude. Titanium, nickel, chromium, copper, zinc, strontium and lead were found in concentrations significant lower compared to iron in all analyzed samples. Each heavy metal species determined were absorbed by lichens thallus in different quantities from a lichen species to other and from one altitude to another. It will be presented in this work the bioaccumulation factor of Evernia divaricata and Parmelia tubulosa for each heavy metal and for each altitude.

Keywords: epiphytic lichens, dominant species, spruce, bioaccumulation, heavy metals.