Repeated phytoextraction of four metal-contaminated soils using the cadmium/zinc hyperaccumulator Sedum plumbizincicola

被引：85
作者：
Li, Zhu [1 ,2 ]
Wu, Longhua [1 ]
Hu, Pengjie [1 ]
Luo, Yongming [1 ,3 ]
Zhang, Hao [4 ]
Christie, Peter [1 ]
机构：
[1] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China
[4] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
来源：
ENVIRONMENTAL POLLUTION | 2014年 / 189卷
基金：
中国国家自然科学基金;
关键词：
Phytoremediation; Metal bioavailability; Bioavailable contaminated stripping (BCS); Diffusive gradients in thin-films (DGT); THLASPI-CAERULESCENS; TRACE-METALS; CD; RHIZOSPHERE; ZN; AVAILABILITY; PLANTS; ZINC; DGT;
D O I：
10.1016/j.envpol.2014.02.034
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A cadmium/zinc hyperaccumulator extracted metals from four contaminated soils over three years in a glasshouse experiment. Changes in plant metal uptake and soil total (aqua regia-extractable) and available metals were investigated. Plant Cd concentrations in a high-Cd acid soil and plant Zn concentrations in two acid soils decreased during repeated phytoextraction and were predicted by soil available metal concentrations. However, on repeated phytoextraction, plant Cd concentrations remained constant in lightly Cd-polluted acid soils, as did plant Cd and Zn in alkaline soils, although soil available metal concentrations decreased markedly. After phytoextraction acid soils showed much higher total metal removal efficiencies, indicating possible suitability of phytoextraction for acid soils. However, DGT-testing, which takes soil metal re-supply into consideration, showed substantial removal of available metal and distinct decreases in metal supply capacity in alkaline soils after phytoextraction, suggesting that a strategy based on lowering the bioavailable contaminant might be feasible. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：176 / 183
页数：8
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