Evaluating the amount of heavy metals in dusts and their absorption by Brant’s oak (Quercus brantii Lindl.) (Case study: Meleh Siah, Ilam)

Document Type : Research article

Authors

1 M.Sc. Student, Faculty of Desert Studies, University of Semnan

2 Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO)

3 Assistant Prof., Faculty of Desert Studies, University of Semnan

4 Senior Research Expert, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO)

Abstract

This study was designed to evaluate the presence of some heavy metals in dust as well as their influences on soil, leaves and twigs of Brant`s oak (Quercusbrantii Lindl.) at a study site located in Meleh-Siah, Ilam province. For two groups intact and declined trees, we measured four elements including Pb, Zn, Ni and Cd in twodifferent time spots (April and September 2013) during the growth period corresponding to the dust events. Sampling results showed an increase in the amount of all elements except for zinc in the sub-canopy soil for both groups of trees. By showing a significant increase (p<0.05) during early spring to late summer, all four elements were shown to be absorbed by both declining and intact oak trees. At twigs samples of intact treesPb, Ni and Cdelements showed increased concentration at the end of growth period while similar significant increases wasn't noticed in twigs of declined trees. Also, apart from Zn content of leaves at second inventory phase, there was no significant difference between declined and intact trees whit respect to studied elements. This study concludes that the heavy metals in dust are highly able to be absorbed by leaf and root. Furthermore, these might be amongst the reasons which decrease the resilience of oak trees against stress factors such as climate change, drought, pest infestations, and overgrazing. 

Keywords

References

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Iranian Journal of Forest and Poplar Research
Volume 23, Issue 4
January 2016
Pages 605-616

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