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| Effects of alien soil improvement of copper tailings on physiological characteristics and heavy metals uptake of Vetiveria zizanioides |
| Received:August 01, 2020 |
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| KeyWord:copper tailings;alien soil-improving;Vetiveria zizanioides;physiological characteristics;heavy metals |
| Author Name | Affiliation | E-mail | | FANG Qing | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | DING Zi-wei | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | SUN Qing-ye | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | sunqingye@ahu.edu.cn | | WANG Ning | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | |
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| Abstract: |
| In order to explore the effect of different alien soil improvement methods on the rehabilitation of tailings, a pot experiment of Vetiveria zizanioides was carried out under improved conditions of soil-mixing treatment(mixing 10% and 20% soil)and soil-covering treatment(covering with 5 cm and 10 cm soil), and the properties of the improved matrix, physio-ecological characteristics, and heavy metals content of plant were determined. Results showed that the application of alien soil increased the content of matrix nutrition elements and decreased the content of available heavy metals(Mn, Cu, Zn, Cd, and Pb), improving the matrix environment of copper tailings. The biomass and photosynthetic pigment content of V. zizanioides increased to different degrees after alien soil improvement. The most significant effect of promoting plant growth was observed in 10 cm soil-covering treatment. Moreover, the content of malondialdehyde (MDA)and activity of antioxidant enzymes such as superoxide dismutase(SOD), catalase(CAT), and peroxidase(POD)in the plant decreased in all the four improved methods, effectively alleviating the biological toxicity of heavy metals. The two soil-mixing treatments had little effect on the heavy metals content of V. zizanioides, whereas soil-covering treatment promoted heavy metals absorption by plant roots. Compared with the control, 10 cm soil-covering treatment increased the Mn, Cu, Zn, Cd, and Pb content of V. zizanioides roots by 104.71%, 47.47%, 103.13%, 61.54%, and 47.82%, respectively. Soil-mixing treatment did not alter the translocation of heavy metals in V. zizanioides; heavy metals were still accumulated in the roots to maintain high plant-resistance. Soil-covering treatment can increase the accumulation of heavy metals in V. zizanioides roots and effectively fix heavy metals in tailings. The alien soil-improving measures of this study can improve the physicochemical properties of copper tailings, promote plant growth, and relieve heavy metals stress. |
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