Barrutia O, Epelde L, García-Plazaola J I, Garbisu C, Becerril J M
Department of Plant Biology and Ecology, University of the Basque Country/EHU, P.O. Box 644, E-48080 Bilbao, Spain.
Chemosphere. 2009 Jan;74(2):259-64. doi: 10.1016/j.chemosphere.2008.09.036. Epub 2008 Oct 31.
Metal tolerance and phytoextraction potential of two common sorrel (Rumex acetosa L.) accessions, collected from a Pb/Zn contaminated site (CS, Lanestosa) and an uncontaminated site (UCS, Larrauri), were studied in fertilized and non-fertilized pots prepared by combining soil samples from both sites in different proportions (i.e., 0%, 33%, 66% and 100% of Lanestosa contaminated soil). The original metalliferous mine soil contained 20480, 4950 and 14 mg kg(-1) of Zn, Pb and Cd, respectively. The microcosm experiment was carried out for two months under greenhouse controlled conditions. It was found that fertilization increased mean plant biomass of both accessions as well as their tolerance. However, only the CS accession survived all treatments even though its biomass decreased proportionally according to the percentage of contaminated mine soil present in the pots. This metallicolous accession would be useful for the revegetation and phytostabilization of mine soils. Due to its high concentration and bioavailability in the contaminated soil, the highest values of metal phytoextracted corresponded to Zn. The CS accession was capable of efficiently phytoextracting metal from the 100% mine soil, indeed reaching very promising phytoextraction rates in the fertilized pots (6.8 mg plant(-1) month(-1)), similar to the ones obtained with hyperaccumulator plants. It was concluded that fertilization is certainly worth being considered for phytoextraction and revegetation with native plants from metalliferous soils.
研究了从铅锌污染场地（CS，拉内斯托萨）和未受污染场地（UCS，拉劳里）采集的两种常见酸模（Rumex acetosa L.）的金属耐受性和植物提取潜力，实验在通过将两个场地的土壤样品按不同比例混合（即0%、33%、66%和100%的拉内斯托萨污染土壤）制备的施肥和未施肥花盆中进行。原始的含金属矿土壤分别含有20480、4950和14 mg kg⁻¹的锌、铅和镉。微观实验在温室控制条件下进行了两个月。结果发现，施肥增加了两个品种的平均植物生物量及其耐受性。然而，只有CS品种在所有处理中都存活了下来，尽管其生物量根据花盆中污染矿土的百分比成比例下降。这种适应金属环境的品种将有助于矿山土壤的植被恢复和植物稳定。由于其在污染土壤中的高浓度和生物有效性，植物提取的金属最高值对应于锌。CS品种能够有效地从100%的矿土中提取金属，在施肥花盆中确实达到了非常有前景的植物提取率（6.8 mg 株⁻¹ 月⁻¹），类似于超积累植物获得的提取率。得出的结论是，对于含金属土壤的植物提取和本地植物植被恢复，施肥肯定值得考虑。
