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Abstract The heavy metal soil restoration effect of Neyraudia reynaudiana (kunth) Keng (abb. for Neyraudia) and Pennisetum americanum × P. purpureum cv. 23 A × N51 cv. Huanan No. 1 (abb. for Pennisetum) transplanted in contaminated soil from e-waste recycling site were explored, whose heavymetal Cd, Cu, Zn, Pb total concentration were 4 678. 44, 14 181. 13 and 15 026. 89 mg/kg as different level pollution, and 270. 04 mg/kg as control (clean soil) respectively. Thus four treatments were designed in the experiment, and the plants were clipped two times, whose above biomass and heavy metal content of Cd, Pb, Cu, and Zn were determined. The results showed that the above biomass of the second clipping of two kinds of plants decreased significantly (P < 0. 05) , and the biomass of plants planted in the contaminated soil was more less than the control's significantly (P < 0. 05) . For the first clipping, the biomass of Neyraudia of four treatments was not significantly different, and biomass of Pennisetum planted in severe pollution was lower than the other treatments' significantly. Mostly, the content of the two kinds of plants planted in polluted soil was higher than in control.Except for Pb content of Neyraudia of first clipping and Cu content of Pennisetum of the second clipping, the other heavy metal content was significantly different between the treatments, and higher significantly or distinctly in pollution than in control. As for Neyraudia, the Cd accumulation was the highest in light pollution, and they were 0. 83 mg/kg (first clipping) , 0. 74 mg/kg (second clipping) . As to Pennisetum, the Cd accumulation was higher in light pollution than in other treatments, and it was 0. 76 mg/kg (first clipping) , and the Cd accumulation of second clipping was 1. 13 mg/kg in light pollution, 1. 19 mg/kg in severe pollution, which were higher significantly than in their other treatments. However, the Zn accumulation of Neyraudia and Pennisetum was high planted in e-waste soil, and also Cu and Pb nextly.Compere the first clipping with the second clipping, all the four heavy metal content decreased distinctly in control, and Cu and Pb content decreased distinctly but Cd and Zn increased distinctly in pollution.The total transfer of Cd, Zn, Pb and Cu by Neyraudia and Pennisetum was the hightest in light pollution, and at that of Cd was higher than in other treatments, in addition, the transfer of Zn and Cu by Neyraudia, and the transfer of Zn and Pb by Pennisetum were also high. The restoration potential of the Pennisetum was better than the Neyraudia's, and they were suitable for phytomediation planted in light contaminated soil in this paper for Cd, Pb, Cu and Zn combined pollution in e-waste soil.
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2018, Vol. 31 
