a School of Environmental Science and Engineering, Sun Yat-sen University , Guangzhou , P. R. China.
c Laboratoire Sols et Environnement, INRA, Universitéde Lorraine , BP 172, 2 avenue de la forê t de Haye, Vandoeuvre-lè s-Nancy Cedex , France.
Int J Phytoremediation. 2018 Apr 16;20(5):415-423. doi: 10.1080/15226514.2017.1365336.
The widespread use of rare earth elements (REEs) has resulted in problems for soil and human health. Phytolacca americana L. is a herbaceous plant widely distributed in Dingnan county of Jiangxi province, China, which is a REE mining region (ion absorption rare earth mine) and the soil has high levels of REEs. An investigation of REE content of P. americana growing naturally in Dingnan county was conducted. REE concentrations in the roots, stems, and leaves of P. americana and in their rhizospheric soils were determined. Results showed that plant REEs concentrations varied among the sampling sites and can reach 1040 mg/kg in the leaves. Plant REEs concentrations decreased in the order of leaf > root > stem and all tissues were characterized by a light REE enrichment and a heavy REE depletion. However, P. americana exhibited preferential accumulation of light REEs during the absorption process (from soil to root) and preferential accumulation of heavy REEs during the translocation process (from stem to leaf). The ability of P. americana to accumulate high REEs in the shoot makes it a potential candidate for understanding the absorption mechanisms of REEs and for the phytoremediation of REEs contaminated soil.
稀土元素（REEs）的广泛应用给土壤和人类健康带来了问题。美洲商陆是一种草本植物，在中国江西省定南县广泛分布，该县是一个稀土矿区（离子吸附型稀土矿），土壤中含有高浓度的 REEs。本研究对定南县自然生长的美洲商陆进行了 REE 含量调查。测定了美洲商陆的根、茎和叶及其根际土壤中的 REE 浓度。结果表明，植物 REE 浓度在采样点之间存在差异，叶片中可达到 1040mg/kg。植物 REE 浓度的顺序为叶＞根＞茎，所有组织均表现为轻 REE 富集和重 REE 亏损。然而，美洲商陆在吸收过程（从土壤到根）中优先积累轻 REEs，在转运过程（从茎到叶）中优先积累重 REEs。美洲商陆在地上部分积累高浓度 REE 的能力使其成为研究 REE 吸收机制和 REE 污染土壤植物修复的潜在候选植物。
