Culture de l’alpiste roseau et du panic érigé sur un sol contaminé en éléments traces métalliques

Authors: Farrier, Léa
Advisor: Karam, Antoine; Royer, Isabelle
Abstract: Trace metal elements (TME) are the second most important contaminant just after hydrocarbons. They represent 34% of contaminated sites in Canada and 46% in Quebec, respectively. The objective of this study was to determine the effect of soil contamination by Cu, Zn and Pb on switchgrass and reed canarygrass crops. From 56 sampling points, contaminated (CZ, n = 21) and uncontaminated zones (UCZ, n = 35) were assigned. From 2016 to 2018, multiple sampling of above-ground biomass plant and soil properties was performed to assess the effect of the presence of TME on crops yield and to determine whether the uptake differs according to plant species. Yields varied between 3.2 and 6.8 T ha-1 for switchgrass and 1.9 and 2.7 T ha-1 for reed canarygrass. No significant differences in yield were observed between the two zones, except for switchgrass in 2016 where it was 1.5 T ha-1 higher in the CZ. For both crops, Cu concentrations were similar between the two zones. For Zn and Pb, they were higher in the CZ than in the UCZ. Total soil metal concentrations generally decreased from 2016. Correlations between TME concentrations in plant and total concentrations in soil are weak. Total TME soil concentrations, Mehlich-3 and DTPA-TEA-CaCl2 (pH 7,3) extracted concentrations are strongly correlated with each other. We conclude that the cultivation of those two crops on metal-contaminated soils is possible without significant crop yield loss compared to uncontaminated soils. Since the uptake differed among the TME, additional studies are needed to conclude that contaminated sites with TME can be use to cultivate switchgrass and reed canarygrass as plant biomass for energy purposes.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 20 September 2021
Grantor: Université Laval
Collection:Thèses et mémoires

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