Accumulation of heavy metals in metallophytes from three mining sites (Southern Centre Morocco) and evaluation of their phytoremediation potential
Accumulation of heavy metals in metallophytes from three mining sites (Southern Centre Morocco) and evaluation of their phytoremediation potential
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DOI：
10.1016/j.ecoenv.2018.11.009
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发表时间：
2019-03-01
影响因子：
6.8
通讯作者：
Mandi, Laila
中科院分区：
文献类型：
--
作者：
Midhat, Laila;Ouazzani, Naaila;Mandi, Laila
目前的研究旨在对摩洛哥中南部的三个废弃矿场进行实地调查，以评估最近土壤中的金属污染和植物物种的积累潜力。在所研究的矿山的几个地点采集了本地植物和土壤，并分析了铜、锌、铅和镉的浓度。调查地点的土壤主要常量营养素缺乏，铜、锌、铅和镉的毒性水平较高。对勘查地点的植物学调查表明，植物群落种类繁多(19科46种)，没有明显的毒性症状。结果表明，同一植物体内重金属含量不同，不同植物间重金属含量也不同。共46种8种植物，分别命名为HirschFeldia incana(L.)Lagr.--Foss、西瓜Citrullus Common garis(L.)Schradi、马齿苋、小针茅、生菜(Lactuca viminea(L.)J.Presl&C.Presl，Forsskaolea tenacissima L.，Lycium trinicatum Boiss.和Harnmada horaria(Pomel)Iljin被认为是表现最好的样品，因为它们在地上和根中积累多种金属的能力很强，而不受过量金属含量的影响。转移因子普遍高于1，证实了这一点。因此，这些耐受的本土植物物种可以作为有效恢复金属污染场地植物的工具。
The current study aims to perform a field survey of three abandoned mining sites in the southern centre of Morocco to assess the recent metal pollution in soils and accumulation potential of plant species. Native plants and soils were sampled at several sites in the studied mines and analysed for Cu, Zn, Pb and Cd concentrations. Soils in the investigated sites proved to be deficient in major macronutrients and to contain toxic levels of Cu, Zn, Pb and Cd. Botanical survey of the prospected sites showed the abundance of diverse plant communities (46 species and 19 families), with no obvious toxicity symptoms. Results showed that the concentrations of heavy metals were different in the same plant species and from plant species to another. Eight plants of 46 species namely Hirschfeldia incana (L.) Lagr.-Foss, Citrullus vulgaris (L.) Schradi, Portulaca oleracea L., Stipa capensis Thunb., Lactuca viminea (L.) J.Presl & C.Presl, Forsskaolea tenacissima L., Lycium intricatum Boiss. and Harnmada scoparia (Pomel) Iljin were considered as the best-performing specimens due to their high ability to accumulate multiple metals in their shoots and roots without being affected by excessive metal contents. This was confirmed by the transfer factors generally higher than 1. Consequently, these tolerant and native plant species could be used as tools for an effective phytorestoration of metal-contaminated sites.