Effect of tree species choice and mineral capping in a woodland phytostabilisation system: A case-study for calcareous dredged sediment landfills with an oxidised topsoil

Bart Vandecasteele, Jürgen Samyn, Bruno De Vos, Bart Muys

    Research output: Contribution to journalA1: Web of Science-articlepeer-review

    Abstract

    Foliar, wood and bark metal concentrations were evaluated 2 and 12 years after afforestation of 3 metal-polluted calcareous upland dredged sediment landfills with an oxidised topsoil. Two techniques for reducing the metal entry into the food web were compared in a field situation: choice of appropriate tree species aiming at reduced metal transfer to the environment, and application of a thin uncontaminated mineral capping layer on top of the polluted sediment aiming at a good topsoil quality. Foliar concentrations show that an appropriate choice of tree species is very important in controlling metal cycling. Common ash, sycamore maple, pedunculate oak, black alder and small-leaved lime had normal foliar metal concentrations, while hybrid poplar showed very high Cd and Zn concentrations. The absence of a thin uncontaminated covering layer resulted in a higher metal load of the litter through direct (surface soil adhesion) and indirect (raindrop splash) soil load of the litter layer. Mineral capping affected foliar concentrations in an element-specific and species-specific way. It is concluded that an uncontaminated covering layer on polluted soils before afforestation is a management option which is only efficient in case of an appropriate tree species choice. © 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    JournalEcological Engineering
    Volume32
    Issue number3
    Pages (from-to)263-273
    Number of pages11
    ISSN0925-8574
    DOIs
    Publication statusPublished - 3-Mar-2008

    Keywords

    • Deciduous trees
    • Foliar chemistry
    • Mull humus
    • Plant-based food
    • Soil adhesion
    • Soil mass loadings

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