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Chalot, Michel; Girardclos, Olivier; Ciadamidaro, Lisa; Zappelini, Cyril; Yung, Loic; Durand, Alexis; Pfendler, Stéphane; Lamy, Isabelle; Driget, Vincent; Blaudez, Damien
The Science of the total environment, 01/2020, Letnik: 699Journal Article
Growing lignocellulosic crops on marginal lands could compose a substantial proportion of future energy resources. The potential of poplar was explored, by devising a field trial of two hectares in 2007 in a metal-contaminated site to quantify the genotypic variation in the growth traits of 14 poplar genotypes grown in short-rotation coppice and to assess element transfer and export by individual genotypes. Our data led us to conclusions about the genotypic variations in poplar growth on a moderately contaminated site, with the Vesten genotype being the most productive. This genotype also accumulated the least amounts of trace elements, whereas the Trichobel genotype accumulated up to 170 mg Zn kg−1 DW in the branches, with large variation being exhibited among the genotypes for trace element (TE) accumulation. Soil element depletion occurred for a range of TEs, whereas the soil content of major nutrients and the pH remained unchanged or slightly increased after 10 years of poplar growth. The higher TE content of bark tissues compared with the wood and the higher proportion of bark in branches compared with the wood led us to recommend that only stem wood be harvested, instead of the whole tree, which will enable a reduction in the risks encountered with TE-enriched biomass in the valorization process. Display omitted •We observed genotypic variations in growth of poplar at a moderately contaminated site.•There were large variations between genotypes for trace element accumulation.•Soil depletion occurred for a range of trace element after 10 years of growth.•Branches had accumulated a lot more elements than wood.•We recommend choosing stemwood-only harvesting instead of whole-tree harvesting.
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