【摘要】 羽叶鬼针草对土壤中Pb的吸收特性和修复潜力的研究结果表明:①鬼针草对Pb有很强的吸收能力,在土壤Pb浓度为2 000mg.L-1时,鬼针草地上部和根系中Pb含量达到最高,分别为2 164.7mg.kg-1和1 509.3 mg.kg-1;②鬼针草植物对Pb的吸收有很强的分异特征,植物吸收的Pb主要富集于地上部,Pb在植物体内的分布规律是叶子>茎>根系>种子;③不同生长期植物对Pb的吸收速度是不同的,植物在开花期对Pb的吸收速度最大,吸收量根系为15.81 mg.(kg.d)-1,地上部是19.83 mg.(kg.d)-1.羽叶鬼针草具备修复土壤Pb污染的潜力.更多还原

【Abstract】 Bidens maximowicziana’s adsorption ability and remediation potential to lead were studied.The results show:① The Bidens maximowicziana has a strong adsorption to lead,the concentration of lead in plants increased linearly with the increase of lead concentration in soil.Then maximum concentration was（1 509.3） mg·kg^-1 in roots and（2 164.7） mg·kg^-1 in shoots when lead concentration in soil was 2 000 mg·L^-1;② The lead concentration distribution order in the Bidens maximowicziana is: leaf>stem>root>seed,which indicate that Bidens maximowicziana has a strong ability to transfer lead;③Uptaking ability differes in different vegetal periods.Maximum lead uptaking rate occured in the period of blooming for 40～60days,in which daily uptake capacity was 15.81 mg·（kg·d）^-1 in roots and 19.83 mg·（kg·d）^-1 in shoots respectively.It can be concluded that Bidens maximowicziana appeares to be a moderate Pb accumulator making it suitable for phytoremediation of Pb contaminated soil.更多还原