3种草本能源植物对Zn胁迫的生理响应与积累特性  

Effects of Zn stress on physiological response and accumulation of three herbs

作　　者：李翠[1] 王庆海[1] 肖波[1] 

机构地区：[1]北京市农林科学院北京草业与环境研究发展中心,北京100097

出　　处：《草业科学》2013年第10期1555-1560,共6页Pratacultural Science

基　　金：北京市农林科学院科技创新能力建设专项(KJCX201103001);北京科技项目(D101105046410001)

摘　　要：草本能源植物通常具有抗逆性强、生物量大的特点,而且利用能源植物去除重金属污染能有效避免二次污染。本研究通过盆栽试验研究了大油芒(Spodiopogon sibiricus)、狼尾草(Penniseturn alopecuroides)、柳枝稷(Panicum virgatum)3种草本能源植物在5种浓度(62.5、125、250、500、1 000 mg·kg-1)Zn胁迫下的生长状况和生理响应,并对3种草本能源植物对Zn的吸收进行了测定。结果显示,3种植物的生长量对Zn胁迫的耐受程度表现为狼尾草>大油芒>柳枝稷,在1 000 mg·kg-1的Zn处理下,柳枝稷的地上生物量和地下生物量与不添加Zn相比分别减少了68.2%和70.5%;狼尾草分别减少了33.7%和69.7%,大油芒与对照相近。3种植物的生理指标都有一定程度的变化,对Zn胁迫的生理响应程度表现为大油芒>狼尾草>柳枝稷。3种植物对Zn的吸收能力表现为狼尾草>大油芒>柳枝稷,在1 000 mg·kg-1的Zn处理下,狼尾草地上和地下部分对Zn的吸收均达到最大值,分别为156.38和303.51 mg·kg-1。Pot experiments were conducted to study the growth of three herbs （Spocliupogon sibiricus ,Penniseturn alopecuroides , Panicurn virgatum ） on Zn-polluted soil with five concentrations （62. 5 , 125 ,250,500,1 000 mg · kg^-1）. Physiological indices and Zn concentration in the three herbs were measuredto assess the tolerance and accumulation for Zn pollution. Aboveground biomass of P. virgatum reduced by68.2 % in Zn treatment 1 000 mg · kg^-1 and belowground biomass reduced by 70. 5 % compared with con-trol. The aboveground biomass and belowground biomass of P. alopecuroides reduced by 33. 7% and69.7% respectively. The biomass of S. sibiricus has no significant difference compared with control,thetolerance was S. sibiricus〉 P. cdopecuroides〉P. virgatum. The physiological indices of the three herbshad significant change, and the change was S. sibiricus〉 P. alopecuroides〉P. virgatum. The accumula-tion of three Kerbs for Zn were P. alopecuroides〉 S. sibiricus〉 P. virgatum. For P. alopecuroides, theaccumulation of aboveground and belowground reached the highevSt value of 156. 38 mg · kg^-1 and 303. 51mg · kg^-1 in the treatment 1 000 mg · kg^-1.

关 键 词：重金属污染 植物修复 生物量 生理指标 植物耐受性 积累特性 

分 类 号：S578[农业科学—作物学]