Retranslocation of foliar heavy metals (Cu, Zn, Cd) in tree species during autumnal leaf senescence (Example of Subtaiga Forests of The East European Plain

In this work the results of study of heavy metals retranslocation from tree species leaves during autumnal senescence are presented. It has been shown that there are two factors influencing on retranslocation: the nature of chemical element and tree species traits. It has been found that the common tendency was the autumnal withdrawal of Cu from aging leaves and accumulation of Zn involved in nitrogen catabolism enzymes synthesis. The portion of toxic Cd retranslocated from the leaves differs greatly among the species.