| 客土改良铜尾矿对香根草生理特征及重金属吸收的影响 |
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| 引用本文： | 方青,丁子微,孙庆业,王宁.客土改良铜尾矿对香根草生理特征及重金属吸收的影响[J].农业环境科学学报,2021,40(1):83-91. |
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| 作者姓名： | 方青 丁子微 孙庆业 王宁 |
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| 作者单位： | 安徽大学资源与环境工程学院, 合肥 230601 |
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| 基金项目： | 安徽省农业生态环保与质量安全产业技术体系专项（AHCYJSTX-15） |
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| 摘 要： | 为了探究不同客土改良方式对尾矿修复的效果,将香根草盆栽试验分别在尾矿掺土(掺土10%和20%)和覆土(覆土5 cm和10 cm)改良条件下进行,并对改良后基质的性质以及植物的生理生态特征和重金属含量进行测定。结果表明:客土加入铜尾矿后,提高了基质营养元素含量,降低了有效态重金属含量(Mn、Cu、Zn、Cd和Pb),改善了铜尾矿基质环境。客土改良后,香根草生物量和光合色素含量都出现不同程度提高,其中覆土10 cm对促进植物生长的作用效果最显著。同时,4种改良方式都能降低植物体中MDA含量和抗氧化酶(SOD、CAT和POD)活性,有效缓解重金属的生物毒性。两种掺土改良处理对香根草体内重金属含量没有较大影响,覆土改良促进了植物根对重金属的吸收,香根草根部Mn、Cu、Zn、Cd和Pb含量在覆土10 cm处理中分别比对照(不加土壤的铜尾矿)增加104.71%、47.47%、103.13%、61.54%和47.82%,掺土改良不改变香根草体内重金属的转运特征,香根草仍将重金属积累在根部以维持较高的重金属抗性,覆土改良可以增加香根草根部重金属的富集,有效固定尾矿中的重金属。研究表明,客土改良方式能够有效改善铜尾矿理化性质,促进植物生长,缓解重金属胁迫。
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| 关 键 词： | 铜尾矿 客土改良 香根草 生理特征 重金属 |
| 收稿时间： | 2020/8/1 0:00:00 |
Effects of alien soil improvement of copper tailings on physiological characteristics and heavy metals uptake of Vetiveria zizanioides |
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| FANG Qing,DING Zi-wei,SUN Qing-ye,WANG Ning.Effects of alien soil improvement of copper tailings on physiological characteristics and heavy metals uptake of Vetiveria zizanioides[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2021,40(1):83-91. |
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| Authors: | FANG Qing DING Zi-wei SUN Qing-ye WANG Ning |
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| Institution: | 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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| Keywords: | copper tailings alien soil-improving Vetiveria zizanioides physiological characteristics heavy metals |
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