柳树对Cd吸收、积累和耐性的初步研究

柳树以其特有的生物学特性,对环境Cd污染具有一定的吸收蓄积能力.对2个杂交柳无性系进行了水培试验,周期为34 d.结果表明:随着溶液中ρ(Cd)的增大和处理时间的延长,叶片中的Cd含量增加.在溶液中ρ(Cd)为0～20 mg/L时,2个无性系叶片中的Cd含量在处理后15 d前增加速度慢,15 d后增加速度快,叶片中Cd含量受溶液中不同ρ(Cd)的影响其无性系表现亦不同.不同器官中的Cd含量表现为根＞叶片＞茎,1号无性系根系中Cd含量小于3号无性系,茎和叶片中Cd含量大于3号无性系.在溶液中ρ(Cd)为0～20 mg/L时,2个无性系各器官的Cd吸收量均表现为根＞叶片＞茎,1号无性系各器官的Cd吸收量大于3号无性系.在溶液中ρ(Cd)为5 mg/L时,Cd大部分留在根系中;随着ρ(Cd)的增大,地上部分迁移量增加.在溶液中ρ(Cd)小于20 mg/L时,Cd胁迫对柳树生长无显著抑制作用. 

Preliminary Research on Cadmium Uptake, Accumulation and Tolerance in Salix

Salix has its special characteristic and some uptake and accumulation capacity for cadmium pollution in the environment.Two hybrid Salix clones were used to be tested in water for thirty-four days.The results indicated that cadmium concentration in leaf increased with cadmium mass concentration in solution and time prolonging.When cadmium mass concentration was 0～20(mg/L) in water,cadmium concentration in leaf of two Salix clones was increased slowly before 15 days and fast after 15 days,cadmium concentration increasing in leaf with cadmium mass concentration in solution was different in different Salix clones.The cadmium concentration in different parts of plant is in the order of root>leaf>stem,cadmium concentration in root of first clone was lower than third clone and first clone was higher than third clone in stem and leaf.When cadmium mass concentration was 0～20(mg/L) in water,the total cadmium uptake in different parts of plant is in the order of root>leaf>stem.The quantity of cadmium uptake in all parts of first clone was higher than third clone.When cadmium mass concentration was 5(mg/L) in solution,there was a great deal of Cd in root,cadmium concentration in overground of plant was more and more with cadmium mass concentration increasing in solution. The growth in Salix had not been distinctly restrained when the cadmium mass concentration is under 20(mg/L).