Chemical and biological properties in the rhizosphere of Lupinus albus alter soil heavy metal fractionation
Chemical and biological properties in the rhizosphere of Lupinus albus alter soil heavy metal fractionation
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DOI：
10.1016/j.ecoenv.2009.12.009
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发表时间：
2010-05-01
影响因子：
6.8
通讯作者：
Bernal, M. P.
中科院分区：
文献类型：
--
作者：
Martinez-Alcala, I.;Walker, D. J.;Bernal, M. P.
为了更好地了解白羽扇豆(Lupinus Albus L)对重金属污染土壤植物修复的适宜性，研究了其根系对影响土壤金属形态的根际化学和生物学性质的影响。植物种植在两种相似的土壤中，锌、镉、铜和铅含量较高，但pH值(4.2和6.8)不同。在这两种土壤的根际，其根诱导了水溶碳的增加，这影响了重金属的分级，最终影响了植物根对重金属的吸收。在酸性土壤根际，0.1M CaCl2可提取态的锰、锌和铜的浓度低于土壤，这可能是由于它们对Fe(III)/羟基氧化物的滞留增加，而在中性土壤中，只有锌的浓度较低。在酸性土壤上生长的植物中发现了更高浓度的重金属，这反映了它们在该土壤中的更高有效性。重金属向地上部的有限转移证实了该物种在重金属最初的植物固定中的潜在作用，特别是在中性-碱性土壤中。皇冠版权所有(C)2009由爱思唯尔公司出版。保留所有权利。
To understand better the suitability of white lupin (Lupinus albus L) for phytoremediation of heavy metal-contaminated soils, the effect of its roots on chemical and biological properties of the rhizosphere affecting soil metal fractionation was studied. Plants were cultivated in two similar soils, with high levels of Zn, Cd, Cu and Pb but differing pH values (4.2 and 6.8). In the rhizosphere of both soils, its roots induced increases in water-soluble carbon, which influenced the fractionation of heavy metals and ultimately their uptake by plant roots. In the rhizosphere of the acid soil, the concentrations of 0.1 M CaCl2-extractable Mn, Zn and Cu were lower than in the bulk soil, possibly due to their increased retention on Fe (III) hydroxides/oxyhydroxides, while in the neutral soil only the Zn concentration was lower. Higher concentrations of heavy metals were found in plants growing on the acid soil, reflecting their greater availability in this soil. The restricted transfer of heavy metals to the shoot confirms the potential role of this species in the initial phytoimmobilisation of heavy metals, particularly in neutral-alkaline soils. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.