Department of Reclamation of Arid and Mountainous Regions, Natural Resources Faculty, University of Tehran, Karaj, Iran.
Department of Reclamation of Arid and Mountainous Regions, Natural Resources Faculty, University of Tehran, Karaj, Iran.
J Environ Manage. 2022 Aug 1;315:115184. doi: 10.1016/j.jenvman.2022.115184. Epub 2022 May 4.
Phytoremediation is a cost-effective, environmentally-friendly and emerging remediation technology that treats polluted areas using plants, having the potential to restore ecosystems and make compromised areas useable again, therefore returning a resource to community use. In the present work a study was conducted on the contamination of soil by heavy metals (Zn, Pb, Cr, Cd, and Co) in the mining area of Angouran (northwestern Iran) and on their uptake by 25 native species present in the mining district, in order to evaluate their potential use in phytoremediation interventions. Plant and soils from three sites around the mine were sampled and characterized, and metals accumulation and translocation were evaluated. Principal Component Analysis (PCA) and Cluster Analysis (CA) were applied to study the behavior of species in the accumulation and translocation of the elements in their tissues. The contents of Zn, Pb, Cr, Cd, and Co in the studied plants were, respectively, 31.77-723.05, 7.78-233.25, 1.77-21.57, 0.04-7.92, and 0.15-9.97 mg/kg. Among the 25 species, 13 plants showed translocation factor greater than one (TF > 1) for Zn, 14 for Pb, 3 for Cr, 10 for Co, and 6 for Cd. Marrubium cuneatum having an accumulation factor greater than one (AF > 1) for Zn and bioconcentration factor greater than one (BCF >1) for Cd can be considered as an accumulator and stabilizer for Zn and Cd, respectively. Also, the highest value of Pb (233.25 mg/kg) and Cr (21.57 mg/kg) were found in the shoot of this plant. Psathyrostachys fragilis with BCF >1 for Co and maximum Pb accumulation in the root can be used as a stabilizer plant for Pb and Co-contaminated soils. Besides, Stipa arabica and Verbascum speciosum, with TF > 1 and rather high AF, could be considered suitable species for removing Zn and Pb through phytoextraction. This research showed that some native species in the study area have considerable potential for developing phytoremediation strategies.
植物修复是一种具有成本效益、环境友好且新兴的修复技术，利用植物来治理污染区域，有潜力恢复生态系统，并使受污染的区域再次得到利用，从而将资源返还给社区使用。在本研究中，对伊朗西北部安古兰（Angouran）矿区土壤中重金属（Zn、Pb、Cr、Cd 和 Co）的污染情况及其在矿区 25 种本地物种中的吸收情况进行了研究，以评估它们在植物修复干预中的潜在应用。对矿区周围的三个地点的植物和土壤进行了采样和特征描述，并对金属的积累和迁移进行了评估。应用主成分分析（PCA）和聚类分析（CA）研究了物种在组织中积累和迁移元素的行为。研究植物中 Zn、Pb、Cr、Cd 和 Co 的含量分别为 31.77-723.05、7.78-233.25、1.77-21.57、0.04-7.92 和 0.15-9.97mg/kg。在 25 种植物中，有 13 种植物的 Zn 转移系数（TF）大于 1，有 14 种植物的 Pb 转移系数大于 1，有 3 种植物的 Cr 转移系数大于 1，有 10 种植物的 Co 转移系数大于 1，有 6 种植物的 Cd 转移系数大于 1。Marrubium cuneatum 对 Zn 的积累系数（AF）大于 1，对 Cd 的生物浓缩系数（BCF）大于 1，可分别视为 Zn 和 Cd 的积累剂和稳定剂。此外，该植物地上部分的 Pb（233.25mg/kg）和 Cr（21.57mg/kg）含量最高。Psathyrostachys fragilis 的 Co 生物浓缩系数（BCF）大于 1，根部对 Pb 的积累量最大，可作为 Pb 和 Co 污染土壤的稳定剂植物。此外，Stipa arabica 和 Verbascum speciosum 的 TF 大于 1，AF 较高，可被视为通过植物提取去除 Zn 和 Pb 的适宜物种。本研究表明，研究区域的一些本地物种具有开发植物修复策略的相当大的潜力。
