白花泡桐对土壤重金属的积累与转运研究

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1000mg／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。

Study on the Role of Paulownia fortunei in Accumulation and Transformation of Heavy Metal in Soil

Objective] The theoretic guidance to the large-scaled regradation of the soil polluted by heavy metal with the Paulownia fortunei was provided.Method] The renewal engineering of the soil near Factory of Pb/Zn Smelter in Shaoguan of Guangdong Province by means of the Paulownia fortunei as dominant plant had been conducted since 1999.The content of heavy metal in the different organs of Paulownia fortunei and in the soils from sampling sites with the different Paulownia fortunei re-vegetating time(four,five...