Short- and longer-term effects of the willow root system on metal extractability in contaminated dredged sediment

Journal of Environmental Quality
P VervaekeM G Verloo

Abstract

Willow (Salix spp.) stands are often proposed as vegetation covers for the restoration and stabilization of contaminated and derelict land. Planting willows on dredged sediment disposal sites for biomass production can be an alternative to traditional capping techniques. However, with the introduction of willow stands on dredged sediment disposal sites, the possibility of increased contaminant availability in the root zone must be acknowledged as it can increase the risk of leaching. Two trials investigated the availability of Cd, Zn, Cu, and Pb in the root zones of willows grown on contaminated sediment. To assess the effects of willow root growth on metal extractability and mobility, bulk and rhizosphere sediment samples were extracted with deionized water, ammonium acetate at pH 7, and ammonium acetate-EDTA at pH 4.65. A rhizobox experiment was used to investigate the short-term effect of willow roots on metal availability in oxic and anoxic sediment. Longer-term effects were assessed in a field trial. The rhizobox trial showed that Cd, Zn, and Cu extractability in the rhizosphere increased while the opposite was observed for Pb. This was attributed to the increased willow-induced oxidation rate in the root zone as a result ...Continue Reading

Citations

Jun 18, 2009·Environmental Science and Pollution Research International·Valérie BertBart Vandecasteele
Jan 22, 2013·The Science of the Total Environment·Johannes TeuchiesPatrick Meire
Jul 23, 2008·The Science of the Total Environment·Filip M G Tack, Bart Vandecasteele
Nov 4, 2017·Ecotoxicology·Tianxue YangLianxi Sheng
Jan 6, 2012·Journal of Environmental Quality·W S LaidlawA J M Baker
Mar 31, 2006·Environmental Science & Technology·Jan MertensFilip M G Tack

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