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摘要
The phytoremediation potential of the following ten indigenous dominant species growing on a heavy-metal-polluted rural industrial wasteland in China was studied: Cirsium setosum (Willd.) MB., Bidens maximowicziana Oett, Humulus japonicas (Lour.) Merr., Setaria viridis (L.) Beauv., Potentilla supina L., Chenopodium serotinum Linn., Taraxacum mongolicum Hand.-Mazz., Kalimeris indica(L.) Sch.-Bip., Solanum nigrum Linn., and Amaranthus retroflexus L. Heavy metal concentrations in soil varied as follows: 3.5-152.2 mg/kg for Cd; 92.8-28,021.8 mg/kg for Pb; 24.6-525.2 mg/kg for Cu; and 33.7-79.1 mg/kg for Cr. In the plants, the concentration ranges were as follows: 6.9-266.8 mg/kg, 216,2-7,788.0 mg/kg, 9.3-190.6 mg/kg, and 12.2-220.2 mg/kg for Cd, Pb, Cu and Cr, respectively. The growth behaviour, heavy metal accumulation, biological transfer coefficient (BTC) and biological accumulation coefficient (BAC) were determined. By comparing the BAC and BTC values, plant accumulation active tends to take and translocate heavy metals. Among the 10 plant species, only the BAC and BTC values of Cirsium setosum were greater than 1 for Cd, Cu, and Cr, thus, this species can potentially be used for the phytoextraction of common heavy metal pollutants. Principal component analysis (PCA) was carried out for the BAC and BCF values of Cd, Pb, Cu, and Cr. Amaranthus retroflexus and Solanum nigrum L. are roughly clustered into the same group, indicating these two plants have a consistent relationship in accumulating Cd and Pb through PCA. Overall, this study showed that herbaceous plant species growing naturally on contaminated sites are potential used for restoring industrial wastelands contaminated by heavy metals.
- 出版日期2018
- 单位北京师范大学
