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Planting woody crops on dredged contaminated sediment provides both positive and negative effects in terms of remediation |
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| Authors: | Hartley William Riby Philip Dickinson Nicholas M Shutes Brian Sparke Shaun Scholz Miklas |
| Institution: | a School of Computing, Science and Engineering, The University of Salford, Cockcroft Building, Salford M5 4WT, UK b School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK c Department of Ecology, Lincoln University, Lincoln 7647, Canterbury, New Zealand d Urban Pollution Research Centre, Department of Natural Sciences, Middlesex University, Hendon, London NW4 4BT, UK |
| Abstract: | There is currently a requirement for studies focusing on the long-term sustainability of phytoremediation technologies. Trace element uptake by Salix, Populus and Alnus species planted in dredged contaminated canal sediment and concentrations in sediment and pore waters were investigated, eight years after a phytoremediation trial was initiated in NW England. Soil biological activity was also measured using invertebrate and microbial assays to determine soil quality improvements. Zinc was the dominant trace metal in foliage and woody stems, and the most mobile trace element in sediment pore water (∼14 mg l−1). Biological activity had improved; earthworm numbers had increased from 5 to 24, and the QBS index (an index of microarthropod groups in soil) had increased from 70 to 88. It is concluded that biological conditions had improved and natural processes appear to be enhancing soil quality, but there remains a potential risk of trace element transfer to the wider environment. |
| Keywords: | Biological activity Metal(loid)s Phytoremediation Woody crops |
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