Journal
ENVIRONMENTAL POLLUTION
Volume 120, Issue 1, Pages 79-86Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0269-7491(02)00130-6
Keywords
biological monitoring; nonparametric statistics; tree bark; INAA; PIXE
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There is a need to start looking into the possibility of tree bark for biomonitoring. Bark from olive trees (Olea europaea Linn.) has been collected over an area in northwestern Portugal, featuring a blend of rural lands, industrial towns and coastal environments. Samples were analysed through INAA and PIXE for their elemental contents. Results from both techniques were reconciled and then compared with an extensive database on 46 trace elements in Parmelia spp. thalli from the same sites and mostly from the very bark substrates. Distribution-free, nonparametric statistics show that, despite signal magnitude, variation patterns of bark and lichen concentrations follow one another in a most significant way. Selected elements in bark also correlate to a superior extent. As far as this investigation goes, there is no reason whatsoever for discarding bark as an alternative to lower epiphytes. (C) 2002 Elsevier Science Ltd. All rights reserved.
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