摘要
采用野外采样系统分析法,研究了不同年限废弃地野艾蒿对Cu、Zn、Pb、Cd的富集与分布。结果表明,不同年限废弃地土壤中重金属的含量随着废弃年限的增加而减少,野艾蒿对Zn和Pb的富集量较大,不同年限废弃地中野艾蒿和土壤Cu、Zn和Pb的含量之间呈极显著正相关,野艾蒿对重金属的吸收、富集有随土壤中重金属含量升高而增加的趋势。野艾蒿的不同部位在不同年限废弃地中累积不同重金属的能力不同,除3a废弃地野艾蒿中Pb的含量地上部分小于地下部分外,其他环境中重金属含量都表现为地上部分大于地下部分。野艾蒿对4种重金属都有不同程度的转运能力,Cu在不同年限废弃地的生物富集系数均为最大,野艾蒿对Cu、Cd转运能力较强。野艾蒿根系对Pb有弱的滞留效应为36.59%,对Cu、Cd、Zn没有滞留效应。综合分析结果表明,野艾蒿能吸收富集多种重金属并且具有耐重金属的特性,基于其具有生物量较大、生长速度快的特点,作为重金属污染的修复植物具有较好的应用前景。
The enrichment and distribution of Pb,Zn,Cu and Cd in A rtemisia lavandulaefolia of different abandoned lead-zinc mine areas were studied. The results showed that the concentrations of heavy metals in soils decreased with abandoned time increasing. A rtemisia lavandulaefolia had a better absorption capacity for zinc and lead. Correlation was significant at 0.01 level between concentrations of Cu,Zn and Pb in plants and soils. The percentage composition of heavy metals in plant increased with their amounts in soils. The metals accumulation by A rtemisia lavandulaefolia differed with its parts and kinds of metals in different abandoned lead-zinc mine areas. The concentrations of heavy metals in shoot was higher than root of this species except lead of the first environment. Besides, the bio-concentration factor of copper was greater than other metals. The TF values of copper and cadmium was higher than lead. The Pb of weak retention rate was 36.59% in root of A rtemisia lavandulaefolia, but it was not retention rate for Cu, Cd, Zn, respectively. Showing by comprehensive analysis that, A rtemisia lavandulaefolia could concentrate different heavy metals and had the characteristics of a greater biomass, which had a better potential and practical use in phytoremediation.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第6期1136-1141,共6页
Journal of Agro-Environment Science
基金
国家科技支撑计划项目(2006BAD15B06)
关键词
野艾蒿
植物修复
生物富集
耐性
Artemisia lavandulaefolia
phytoremediation
bio-concentration
tolerance
