垂柳对镉吸收、积累与耐性的特点分析  

Studies on cadmium uptake,accumulation and tolerance in Salix babylonica

作　　者：杨卫东[1] 陈益泰[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《南京林业大学学报（自然科学版）》2009年第5期17-20,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：浙江省科技厅重大项目(2006C12065)

摘　　要：采用水培试验方法,研究了镉(Cd)对垂柳3个无性系生长、吸收、积累及耐性的影响。结果表明:Cd对垂柳生长参数影响与无性系和介质中Cd的剂量有关,低浓度Cd(10μmol/L)对3个无性系生长参数影响不显著;根系与地上部分Cd含量随介质中Cd浓度升高而增加;Cd主要积累于垂柳根部,地上部分Cd积累在无性系之间存在差异,Cd浓度为10μmol/L时,3无性系地上部分含Cd量均大于100μg/g,迁移系数(TF)小于1。地上Cd积累总量与垂柳根系Cd积累总量比值大于1;Cd对3无性系耐性指数(IT)的影响也与无性系及介质中Cd浓度有关,Cd浓度为10μmol/L时,以根表示的忍耐系数为0.80～0.93,以地上部分表示的忍耐系数为0.74～0.96。说明垂柳对低浓度Cd(10μmol/L)胁迫有较强的吸收和忍耐能力,具有一定植物修复潜力。Cadmium uptake, accumulation and tolerance potential of three weeping willow （Salix babylonica L. ） clones were investigated through hydroponic culture. The results showed that changes of growth parameters in three clones were related to clones and Cd levels in the medium, growth parameters of three clones were not significantly influenced at low Cd concentration （10 umol/L） , Cd concentrations in roots and shoots was increased with elevated Cd levels, high accumulation of Cd was found manly in roots, there was remarkable difference on Cd concentration of shoots among clones. At 10 umol/L Cd, Cd concentration in shoots of three clones was more than 100 ug/g, translocation factors （TF） of three clones were less than 1, however, ratio of total amount of Cd in shoots to Cd in roots was more than 1. Tolerance indexes （TI） of three clones were related to clones and Cd levels in the medium, TIroot, of 10 umol/L Cd was 0.80-- 0. 93, and TIshoot of 10 umol/L was 0. 74--0. 96. Above results suggested that S. babylonica could tolerate and accumulate Cd at low concentration （ 10 umol/L） , and was suitable for potential phytoremediation.

关 键 词：垂柳 镉 积累 植物修复 

分 类 号：S718[农业科学—林学]