摘要
[目的]为利用白花泡桐进行大规模重金属污染地修复提供理论指导。[方法]从1999年在广东韶关铅锌冶炼厂附近开始实施以白花泡桐为主要修复植物的修复工程,分别选择了泡桐栽培4、5、6、7年的区域为样地,并对土壤和白花泡桐不同器官的重金属含量进行分析。[结果]土壤重金属全量随着修复时间的延长而持续增加,但DTPA可提取态含量持续减少。植物根和叶的Pb平均含量高于1 000 mg/kg,达到了超富集水平。Cu、Cd和Zn在植物体内同样积累较高的浓度。除修复7年样地外,Cu、Pb、Cd和Zn的转运系数均大于1。Cu、Pb、Cd和Zn在所有样地富集系数均大于1。[结论]白花泡桐对重金属具有明显的固定作用,可以对复合重金属污染地进行有效的植被修复。
[ Objective ] The theoretic guidance to the large-scaled regradation of the soil polluted by heavy metal with the Paulowniafortunei was provided. [ Method] The renewal engineering of the soil near Factory of Pb/Zn Smelter in Shaoguan of Guangdong Province by means of the Paulowniafortunei as dominant plant had been conducted since 1999. The content of heavy metal in the different organs of Paulowniafortunei and in the soils from sampling sites with the different Paulowniafortunei re-vegetating time（four, five, six and seven years） was analyzed. [ Results ] The content of heavy metal in soil was consistently increased with re-vegetation time lasting, but the content of DTPA-extractable metal was decreased. Average content heavy metal-Pb in leaf and root in four sites were higher than standard level of hyper-accumulator （1 00 mg/kg）. The accumulation of Cu, Cd and Zn in P. fortunei had a high level but did not approach the hyper-accumulation level. Translocation factor of leaf（TFleaf） for Cu, Pb, Cd and Zn, except for sampling site of seven-year, were all higher than 1, and the bio-concentration factor（BCF） were higher than 1 in all four sites. [ Conclusion] Paulowniafortunei had the obvious faxing function to heavy metal from soil and could be used for the renewal soil populated by the heavy metal.
出处
《安徽农业科学》
CAS
北大核心
2009年第25期12063-12065,12069,共4页
Journal of Anhui Agricultural Sciences
基金
浙江省自然科学基金(Y507053)
浙江省大学生科技创新项目资助
关键词
白花泡桐
重金属
积累
转运
Paulownia fortunei
Heavy metal
Accumulation
Transformation
