六种木本植物对铅锌尾矿库重金属富集力的研究

摘要

The bioaccumulation capability and transfer characteristics of Pb,Zn,Cu and Cd in soil and 6 different woody plants collected from a typical lead-zinc mine wasteland of Zixing City,Hunan province were investigated,including Cun-ninghamia lanceolata (Lamb. ) Hook.,Populus L.,Koelreuteria paniculata,Paulownia.,Cinnamomum camphora (L.)Presl.,and Sapium sebiferum (L.)Roxb. The results showed that the 6 plants could adapt to the heavy metal pol-luted environment,and there was a positive correlation between the heavy metal content in plants and soil. S. sebiferum (L.)Roxb. had the largest Pb bioaccumulation factor of 0.029;Paulownia. had the highest Zn bioaccumulation factor of 0.374;the largest Pb transfer factor of 1.314 were found in K. paniculata;and Zn transfer factor of Paulownia. reached 1.452. These 3 woody plants are suitable for phytoremediation of lead-zinc mine.%通过对湖南省资兴市某已闭库并实施生态修复的铅锌尾矿库及周边受污染土壤和植物的采样分析，以ICP—ASE电感耦合等离子体发射光谱法测定了杉木、杨树、栾树、泡桐、香樟和乌桕等6种木本植物中Pb、Zn、Cu和Cd等重金属元素的含量，并运用转运系数和富集系数分析了植物相应的富集能力与转运特征。结果表明：6种植物中，对Pb富集系数最大的为乌桕，达到0.029；对Zn富集系数最大的为泡桐，达到0.374；栾树对Pb的转运系数达到1.314；泡桐对于Zn的转运系数达到1.452。6种植物均能适应铅锌重度污染的生长环境，其中乌桕、泡桐、栾树富集和转运Pb、Zn能力突出，适宜作为铅锌矿区植物修复的主要木本树种。