Fractions chimiques du plomb dans le sol et phyto-extraction du plomb par le saule (Salix miyabeana) cultivé dans un sol calcaire riche en éléments traces métalliques traité avec des amendements acides

Authors: Diallo, Bocar Allaye
Advisor: Karam, Antoine
Abstract: The presence of large amounts or mobile fraction of lead (Pb) in soils is undesirable because Pb is highly toxic even in minor quantity in the environment. The remediation of Pb in calcareous soils with high amount of metallic trace metals (MTE) can be achieved by phytostabilization or induced phytoextraction processes. For this purpose, a greenhouse study was carried out to determine the effects of elemental sulfur (S0) and mineral fertilizers (N-P-K) followed by the addition of high amounts of sulfuric acid (H2SO4) to cultivated soils on the soil chemical fractions of Pb, growth parameters and uptake and accumulation of Pb in willow (Salix miyabeana) grown in a calcareous soil (mean pH 7.55) rich in MTE. The results indicate that in near neutral and weak alkaline conditions, willow accumulates very small amount of Pb (<1 mg / kg d.w, below the detection limit) in the leaves. Nevertheless, some proportion of soil Pb can be mobilized by plant roots, particularly under acidic conditions. Willow accumulates more Pb in the roots than in other plant parts, regardless of the nature of soil treatments. Soil pH plays an important role in the uptake and accumulation of Pb in willow parts. However, a pH value less than 5.5 tends to produce an excess of Pb removal and causes inhibition of leaf growth or a considerable reduction in leaf yield. This is to be considered when attempting to reduce the pH value of a calcareous soil rich in MTE to less than 6.5, in order to enhance the soil-plant transfer of Pb.
Document Type: Thèse de doctorat
Issue Date: 2019
Open Access Date: 3 February 2021
Grantor: Université Laval
Collection:Thèses et mémoires

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