重金属Zn Cu对香根草生理生化指标的影响及其积累特性研究  

Effects of Zn and Cu on Physiological and Biochemical Processes and Their Accumulation Characteristics of Vetiver

作　　者：努扎艾提.艾比布 刘云国[1] 宋华晓[1] 徐立[1] 陈贝贝[1] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]新疆师范大学生命科学与化学学院,新疆乌鲁木齐830053

出　　处：《农业环境科学学报》2010年第1期54-59,共6页Journal of Agro-Environment Science

基　　金："十一.五"国家科技支撑项目(2006BAD03A1704;2006BAD-03A1706)

摘　　要：采用水培方法,研究了不同浓度Zn、Cu对香根草生物量、含水量、叶绿素、MDA、可溶性蛋白质含量、根系活力以及Zn、Cu在香根草体内的积累和分布的影响。结果表明,低浓度的Zn、Cu刺激了香根草的生长,提高了香根草的生物量、含水量、叶绿素含量以及根系活力;高浓度的Zn、Cu使香根草生物量、含水量、叶绿素、可溶性蛋白质含量和根系活力均不同程度地下降,MDA含量增加;香根草根系中积累的重金属含量随处理浓度的增加逐渐增加,当处理浓度为60mg·L-1时,根系干重富集的Zn、Cu分别达到2581和6528mg·kg-1。两种重金属在香根草植株内的分布主要以根部积累为主,地上部积累的重金属含量极少。Vetiver was grown in hydroponic conditions to investigate the effect of Zn and Cu on growth, water content, leaf chlorophyll con- centration, malondialdehyde （MDA）, soluble protein, root activity and metal accumulation. Results indicated that low level of Zn and Cu could significantly increase the biomass, water content, chlorophyll content and root activity. The treatment of vetiver with high level of Zn and Cu induced decrease in biomass, water content, chlorophyll, soluble protein content, root activity along with enhanced MDA content. The heavy metal contents in roots of vetiver increased with increasing solution concentration of Zn and Cu. The roots in plants exposed to 60 mg. L-1 Zn and Cu accumulated 2 581 mg-kg-l of Zn and 6 528 mg. kg-1 of Cu. Plants transported only a small amount of Zn and Cu to their shoots and leaves and concentrations in these tissues were low.

关 键 词：香根草 ZN CU 生理生化指标 重金属积累特性 

分 类 号：X503.233[环境科学与工程—环境工程]