Vervaeke P, Luyssaert S, Mertens J, Meers E, Tack F M G, Lust N
Laboratory of Forestry, Department of Forest and Water Management, Ghent University, Geraardsbergse steenweg 267, 9090, Gontrode, Belgium.
Environ Pollut. 2003;126(2):275-82. doi: 10.1016/s0269-7491(03)00189-1.
Establishing fast growing willow stands on land disposed contaminated dredged sediment can result in the revaluation of this material and opens possibilities for phytoremediation. A field trial was designed to assess the impact of planting a willow stand (Salix viminalis L. 'Orm') on the dissipation of organic contaminants (mineral oil and PAHs) in dredged sediment. In addition, the accumulation of heavy metals (Cd, Cu, Pb and Zn) in the biomass was determined. After 1.5 years, a significant decrease of 57% in the mineral oil concentration in the sediment planted with willow was observed. Degradation of mineral oil in sediment which was left fallow, was only 15%. The mineral oil degradation under willow was most pronounced (79%) in the root zone of the stand. In the sediment which was left fallow there was a significant reduction of the total PAH content by 32% compared with a 23% reduction in the planted sediment. The moderate and selective metal uptake, measured in this study, limits the prospects for phytoextraction of metals from dredged sediment.
在受污染疏浚沉积物处置的土地上建立速生柳树林，可使这种材料得到重新利用，并为植物修复开辟可能性。设计了一项田间试验，以评估种植柳树林（垂柳‘奥尔姆’）对疏浚沉积物中有机污染物（矿物油和多环芳烃）消散的影响。此外，还测定了生物量中重金属（镉、铜、铅和锌）的积累情况。1.5年后，观察到种植柳树的沉积物中矿物油浓度显著下降了57%。休耕沉积物中矿物油的降解率仅为15%。柳树下矿物油的降解在林分根区最为明显（79%）。与种植沉积物中23%的减少相比，休耕沉积物中总多环芳烃含量显著降低了32%。本研究中测得的适度和选择性金属吸收限制了从疏浚沉积物中植物提取金属的前景。
