Accumulation of lead, zinc, copper and cadmium by 12 wetland plant species thriving in metal-contaminated sites in China

被引：505

作者：

Deng, H

Ye, ZH

Wong, MH ^{[1
]}

机构：

[1] Hong Kong Baptist Univ, Croucher Inst Environm Sci, Hong Kong, Hong Kong, Peoples R China

[2] Hong Kong Baptist Univ, Dept Biol, Hong Kong, Hong Kong, Peoples R China

[3] Zhongshan Univ, Sch Life Sci, Guangzhou, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2004年 / 132卷 / 01期

基金：

中国国家自然科学基金;

关键词：

heavy metals; metal accumulation; metal tolerance; wetland plants;

D O I：

10.1016/j.envpol.2004.03.030

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The concentrations of lead, zinc, copper and cadmium accumulated by 12 emergent-rooted wetland plant species including different populations of Leersia hexandra, Juncus effusus and Equisetum ramosisti were investigated in field conditions of China. The results showed that metal accumulation by wetland plants differed among species, populations and tissues. Populations grown in substrata with elevated metals contained significantly higher metals in plants. Metals accumulated by wetland plants were mostly distributed in root tissues, suggesting that an exclusion strategy for metal tolerance widely exists in them. That some species/ populations could accumulate relatively high metal concentrations (far above the toxic concentration to plants) in their shoots indicates that internal detoxification metal tolerance mechanism(s) are also included. The factors affecting metal accumulation by wetland plants include metal concentrations, pH, and nutrient status in substrata. Mostly concentrations of Pb and Cu in both aboveground and underground tissues of the plants were significantly positively related to their total and/or DTPA-extractable fractions in substrata while negatively to soil N and P, respectively. The potential use of these wetland plants in phytoremediation is also discussed. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：29 / 40

页数：12

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