三种田间杂草的镉、铅富集特征研究

选择了三叶鬼针草（Bidens pilosa）、青蒿（Herba Artemisiae Annuae）、飞蓬（Erigeron acer）3种田间杂草进行盆栽试验,其间用不同浓度的镉、铅溶液处理,最后测定杂草根系及地上部镉、铅量。结果表明：3种田间杂草无论是根系,还是地上部,镉、铅量都随处理液浓度增高而增高;3种杂草对镉的富集系数排序为：三叶鬼针草〉飞蓬〉青蒿;转移系数排序为：三叶鬼针草〉青蒿〉飞蓬;对铅的富集系数排序为：飞蓬〉青蒿〉三叶鬼针草;转移系数排序为：飞蓬〉青蒿〉三叶鬼针草。研究还表明,3种杂草对于镉的富集系数和转移系数都远大于对铅的富集系数和转移系数,三叶鬼针草是镉的超富集田间杂草。

Study on Enrichment Characteristics of Cadmium and Lead of Three Field Weeds

Three field weeds involving in Bidens pilosa and Herba Artemisiae Annuae and Erigeron acer were chosen to start pot cultivation experiment.During the time,the weeds were irrigated with different concentration of cadmium lead solution.The contents of cadmium lead in the roots and stem-leaves were determined.The research showed that the contents of cadmium lead in the roots and stem-leaves are increasing with higher and higher concentration of cadmium lead solution.The enrichment coefficient of cadmium of three field weeds was as follows： Bidens pilosa 〉Erigeron acer 〉Herba Artemisiae Annuae;and the transfer coefficient of cadmium was as follows： Bidens pilosa 〉Erigeron acer 〉Herba Artemisiae Annuae.The enrichment coefficient of lead of three field weeds was as follows： Erigeron acer 〉Herba Artemisiae Annuae〉 Bidens pilosa;and the transfer coefficient of lead was as follows： Erigeron acer 〉Herba Artemisiae Annuae〉 Bidens pilosa.The research also indicated that the enrichment coefficient and transfer coefficient of cadmium of three field weeds were all higher than that of lead.Bidens pilosa is a kind of hyperaccumulative field weed of cadmium.