Responses of ramie(Boehmeria nivea L.)to increasing rare earth element(REE)concentrations in a hydroponic system  

作　　者：Chang Liu Wenshen Liu Hermine Huot Yiming Yang Meina Guo Jean Louis Morel Yetao Tang Rongliang Qiu 

机构地区：[1]School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]Laboratoire Sols et Environnement,INRAE-Universitéde Lorraine,54505,Vandceuvre-les-Nancy,France [3]Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Guangzhou 510275,China [4]Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Journal of Rare Earths》2022年第5期840-846,I0006,共8页稀土学报（英文版）

基　　金：Project supported by the Key R&D Program of Jiangxi Province(20192ACB70016);the National Natural Science Foundation of China(41771343);the 111 Project(B18060);the Sino-French Cai Yuanpei Programme(38896SC)。

摘　　要：A number of studies have focused on the effects of rare earth elements(REEs) on crop plants,while little attention has been paid on how tolerant plant species respond to increasing mixed REE concentrations.In this study,ramie(Boehmeria nivea L.) was exposed to a series of REE concentrations prepared with equimolar mixtures of 16 REEs(i.e.0,1.6,8,16,80,160,400,800 μmol/L) in order to explore REE accumulation and fractionation characteristics in ramie and the responses of this plant to mixed REEs.Results show that ramie root and shoot biomasses are unaffected under lower REE concentrations(1.6-80 μmol/L),while the growth of ramie and the uptake of nutrients especially Ca and Mn are largely inhibited under higher REE concentrations(160-800 μmol/L).The P and Mo concentrations in the roots increase with the increasing REE concentrations in the solution,suggestive of an involvement of P and Mo in dealing with the high concentrations of REEs in this plant.The preferential uptake of Ce and heavy REEs(HREEs) and the preferential transport of HREEs within the plant lead to a positive Ce anomaly and a HREE enrichment in ramie leaves.Our study suggests that ramie could be a good candidate for the phyto re mediation of heavily REE-contaminated soils(e.g.,REE mine tailings in southern China).Our results also shed light on points of taking into account phytoremediation management strategies of REEcontaminated soils(e.g.,P and Mo fertilization).

关 键 词：PHYTOREMEDIATION RAMIE Rare earth elements FRACTIONATION MOLYBDENUM Phosphorus 

分 类 号：X173[环境科学与工程—环境科学]