University of Trás-os-Montes e Alto Douro, UTAD, School of Life Sciences and the Environment, Quinta de Prados, 5000-801 Vila Real, Portugal; MARE, Marine and Environmental Sciences Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
MARE, Marine and Environmental Sciences Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal; University of Coimbra, Faculty of Sciences and Technology, Department of Earth Sciences, 3001-401 Coimbra, Portugal; Instituto de Geologia e Petróleo de Timor Leste, Timor-Leste.
Sci Total Environ. 2016 Oct 15;568:350-368. doi: 10.1016/j.scitotenv.2016.06.024. Epub 2016 Jun 15.
The present study highlights the uranium (U) concentrations in water-soil-plant matrices and the efficiency considering a heterogeneous assemblage of terrestrial and aquatic native plant species to act as the biomonitor and phytoremediator for environmental U-contamination in the Sevilha mine (uraniferous region of Beiras, Central Portugal). A total of 53 plant species belonging to 22 families was collected from 24 study sites along with ambient soil and/or water samples. The concentration of U showed wide range of variations in the ambient medium: 7.5 to 557mgkg(-1) for soil and 0.4 to 113μgL(-1) for water. The maximum potential of U accumulation was recorded in roots of the following terrestrial plants: Juncus squarrosus (450mgkg(-1) DW), Carlina corymbosa (181mgkg(-1) DW) and Juncus bufonius (39.9mgkg(-1) DW), followed by the aquatic macrophytes, namely Callitriche stagnalis (55.6mgkg(-1) DW) Lemna minor (53.0mgkg(-1) DW) and Riccia fluitans (50.6mgkg(-1) DW). Accumulation of U in plant tissues exhibited the following decreasing trend: root>leaves>stem>flowers/fruits and this confirms the unique efficiency of roots in accumulating this radionuclide from host soil/sediment (phytostabilization). Overall, the accumulation pattern in the studied aquatic plants (L. minor, R. fluitans, C. stagnalis and Lythrum portula) dominated over most of the terrestrial counterpart. Among terrestrial plants, the higher mean bioconcentration factor (≈1 in roots/rhizomes of C. corymbosa and J. squarrosus) and translocation factor (31 in Andryala integrifolia) were encountered in the representing families Asteraceae and Juncaceae. Hence, these terrestrial plants can be treated as the promising candidates for the development of the phytostabilization or phytoextraction methodologies based on the accumulation, abundance and biomass production.
本研究重点研究了铀（U）在水土植物基质中的浓度，并考虑了一组陆地和水生本地植物物种的异质组合，以作为塞维利亚（葡萄牙中部比拉斯地区的铀矿区）环境 U 污染的生物监测和植物修复剂。从 24 个研究点共采集了 53 种属于 22 科的植物，以及环境土壤和/或水样。环境介质中 U 的浓度变化范围很广：土壤中为 7.5 至 557mgkg(-1)，水中为 0.4 至 113μgL(-1)。U 积累最大潜力记录在以下陆生植物的根部：Juncus squarrosus（450mgkg(-1) DW）、Carlina corymbosa（181mgkg(-1) DW）和 Juncus bufonius（39.9mgkg(-1) DW），其次是水生大型植物，即 Callitriche stagnalis（55.6mgkg(-1) DW）、Lemna minor（53.0mgkg(-1) DW）和 Riccia fluitans（50.6mgkg(-1) DW）。U 在植物组织中的积累表现出以下递减趋势：根>叶>茎>花/果，这证实了根部从宿主土壤/沉积物（植物稳定化）中积累这种放射性核素的独特效率。总体而言，在研究的水生植物（L. minor、R. fluitans、C. stagnalis 和 Lythrum portula）中的积累模式超过了大多数陆生植物。在陆生植物中，较高的平均生物浓缩系数（≈1，在 C. corymbosa 和 J. squarrosus 的根/根茎中）和迁移因子（31，在 Andryala integrifolia 中）出现在代表科 Asteraceae 和 Juncaceae 中。因此，这些陆生植物可以被视为开发基于积累、丰度和生物量生产的植物稳定化或植物提取方法的有前途的候选植物。
