Metal extraction by Arabidopsis halleri grown on an unpolluted soil amended with various metal-bearing solids:: a pot experiment
Metal extraction by Arabidopsis halleri grown on an unpolluted soil amended with various metal-bearing solids:: a pot experiment
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DOI：
10.1016/s0269-7491(00)00203-7
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发表时间：
2001-01-01
影响因子：
8.9
通讯作者：
Balabane, M
中科院分区：
文献类型：
--
作者：
Dahmani-Muller, H;van Oort, F;Balabane, M
大多数涉及植物修复的研究都考虑了金属提取效率与土壤样品金属浓度或土壤溶液金属浓度的关系。然而，人们对各种含金属固体对植物生长和超富集植物金属提取的影响知之甚少。在这项研究中，我们研究了拟南芥从不同基质中生长和提取金属的能力，这些基质包含在未污染的土壤中，并用锌冶炼厂周围土壤中收集的各种含金属固体进行了改良。用作改良剂的含金属固体是：土壤中新鲜的和分解的有机残留物、土壤粘土部分和两种废渣。还使用纯单金属盐（ZnSO4）。生产了两个系列的基材，一个是中度污染，另一个是高度污染。由未改良的土壤形成额外的基质，并用作未污染的对照。在 A. Halleri 的基质、根和芽中测量了 Zn、Cd、Cu 和 Pb。研究表明，A. Halleri 的干物质产量并不取决于所用含金属固体的性质，除非怀疑铜毒性。在高污染基质上，A.halleri 提取锌取决于所用含金属固体的性质，表现出以下趋势：纯单金属盐>废渣和土壤粘土部分>新鲜和分解的有机物。我们通过锌在单金属盐中的高溶解度来解释这些差异，而在含金属矿物固体以及新鲜和分解的有机物中，锌的释放分别需要矿物风化或有机物矿化。这项工作清楚地表明，植物修复研究必须考虑受污染土壤中含金属固体的性质，以更好地预测植物提取的效率。 (C) 2001 Elsevier Science Ltd. 保留所有权利。
Most studies dealing with phytoremediation have considered metal extraction efficiency in relation to metal concentration of bulk soil samples or metal concentration of the soil solution. However, little is known about the effect of various metal-bearing solids on plant growth and metal extraction of hyperaccumulators. In this study, we investigated the ability of Arabidopsis halleri to grow and extract metals from different substrates consisting in an unpolluted soil amended with various metal-bearing solids collected in soils around a Zn smelter complex. The metal-bearing solids used as amendments were: fresh and decomposing organic residues in the soil, a soil clay fraction and two waste slags. Pure mono-metallic salt (ZnSO4) was also used. Two series of substrates were produced, one moderately polluted, and the other highly polluted. An additional substrate was formed by the unamended soil, and used as an unpolluted control. Zn, Cd, Cu, and Pb were measured in the substrates, and in the roots and shoots of A. halleri. The dry matter yield of A. halleri was shown not to depend on the nature of the metal-bearing solid used, except when Cu-toxicity was suspected. On highly-polluted substrates, Zn extraction by A. halleri depended on the nature of metal-bearing solids used, showing the following trend: pure mono-metallic salt>waste slags and soil clay fraction>fresh and decomposing organic matter. We explained these differences by the high solubility of Zn in the mono-metallic salt, whereas in the mineral metal-bearing solids and in both fresh and decomposing organic matter, Zn release required mineral weathering or organic matter mineralization, respectively. This work clearly showed that phytoremediation studies have to consider the nature of metal-bearing solids in contaminated soils to better predict the efficiency of plant extraction. (C) 2001 Elsevier Science Ltd. All rights reserved.