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Our aim was to determine the long-term effect of a mulching treatment on copper (Cu) and nickel (Ni) uptake by tree seedlings (Pinus sylvestris L. and Betula pubescens Ehrh.) from smelter-polluted forest soil in southwestern Finland. A mulch cover spread onto polluted barren soil did not have a clear positive impact on the biomass production and it did not decrease metal uptake by planted tree seedlings during a ten-year study period. In contrast, the Cu uptake by the above-ground parts ofdoi:10.4236/ojap.2013.23008 fatcat:btrfhjwxsncapcfua5jhztyste