Heavy metal accumulation and distribution in forest understory herb species of carpathian beech ecosystems

Abstract

This study addresses the issue of heavy metal (HM) accumulation and distribution for three different plant species, Carex pilosa, Dentaria bulbifera, Galium odoratum, in Carpathian beech ecosystems. Data are presented on HM concentrations in forest understory vegetation and a preliminary insight into different HM allocation patterns is provided. Bioaccumulation factors (BCFs) and shoot/root ratios differed considerably among the species and between polluted and unpolluted regions. HMs were accumulated in forest plants as follows: Zn> Cd > Cu >Pb in unpolluted areas and Zn> Cd > Cu >Pb in polluted areas. Zn was preferentially distributed to roots and Cu to shoots. The distribution of Cd and Pb in different plant parts was specific in terms of the species-dependence. Cd and Pb levels in Carex pilosa and Galium odoratum were more strictly controlled in the transfer zone of root-shoot, compared to Dentaria bulbifera. The highest BCFs were found in Carex pilosa for Cu (5.9) and in Dentaria bulbifera was found the highest shoot/root ratio for Cd (3.1).