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 |
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Authors: | Bart Vandecasteele Jürgen Samyn Bruno De Vos Bart Muys |
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Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy;2. Università degli Studi di Roma La Sapienza, Piazza Aldo Moro 5, 00185 Rome, Italy;1. Departamento de Economía Agraria, Estadística y Gestión de Empresas, Universidad Politécnica de Madrid, Madrid, Spain;2. Grupo de Investigación GeoAmbiental, Universidad de Extremadura, Cáceres, Spain;3. Estación Experimental de Zonas Áridas, Consejo Superior de Investigaciones Científicas, Almería, Spain;1. Wroclaw University of Environmental and Life Sciences, Institute of Soil Science and Environmental Protection, ul. Grunwaldzka 53, 50-357 Wroclaw, Poland;2. Poznan University of Life Sciences, Department of Pedology and Waste Land Recultivation, Piątkowska 94, 60-649 Poznań, Poland |
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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. |
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