镧对铜尾矿区黑麦草铜耐性与积累特性的影响  

Effects of La on Tolerance and Accumulation of Copper of Lolium perenne in Copper Tailings Yard

作　　者：王友保[1,2] 吴亭亭[1] 燕傲蕾[1] 代杰[1] 陶洁敏[1] 

机构地区：[1]安徽师范大学生命科学学院,安徽芜湖241000 [2]安徽师范大学生物环境与生态安全安徽省高校省级重点实验室,安徽芜湖241000

出　　处：《土壤通报》2012年第3期731-736,共6页Chinese Journal of Soil Science

基　　金：国家自然科学基金(31070401);安徽省高校自然科学基金重点项目(KJ2009A104;KJ 2010 A 152);重要生物资源保护与利用研究安徽省重点实验室基金项目资助

摘　　要：通过对铜陵铜尾矿库地区土壤添加不同浓度的La,研究了外源La处理对高浓度Cu胁迫下,黑麦草对Cu的耐性和积累特性的影响。结果表明:低浓度La对黑麦草种子萌发起到了促进作用,而高浓度La对黑麦草种子萌发有抑制作用。当La浓度达到100 mg kg-1时,La对黑麦草的发芽率、发芽指数、生物量和耐性指数较对照组均达到显著抑制水平(P<0.05)。黑麦草的茎叶重、根重、茎叶长、根长和耐性指数随着La浓度的增加而减少,平均抑制率分别为:11.90%、12.62%、7.21%、13.78%和13.33%。La对黑麦草的根生长的抑制作用大于茎叶。La对根重的平均抑制率比茎叶重高出2.77%;对根长的平均抑制率比茎叶长高出6.75%。黑麦草体内Cu含量随着添加La浓度的增加而增加,其中根系中Cu的含量平均上升了6.99%,地上部分Cu的含量平均上升了8.49%。显示出外源La处理增加了黑麦草对铜尾矿库区Cu的吸收和迁移。Through adding different concentrations of La to the soil which collected from copper tailings yard,this paper studied the effects of La on tolerance and accumulation of Lolium perenne under higher concentration of Cu stress.The results showed that La promoted the germination of L.perenne in low concentration of Cu while inhibited in high concentration.The germination rate,germination index,biomass and tolerance index were inhibited significantly with control group（P 0.05） when the concentration of La was up to 100 mg kg-1.The length of leaf and stem,length of root,weight of leaf and stem and weight of root were inhibited by La,and the average inhibiting rates were 11.90%,12.62%,7.21%,13.78% and 13.33%,respectively.The inhibition of La on the growth of root was stronger than that of leaf and stem.The average inhibiting rate of root weight was 2.77% higher than those of leaf and stem,while the inhibiting rate of root length was 6.75% higher than leaf and stem.The content of Cu in L.perenne was increased with the increasing of La concentration.It increased 8.49% and 6.99% in above ground and root respectively.In conclusion,the treatment of added La could enhance the accumulation and transportation of Cu in L.perenne in copper tailings yard.

关 键 词：铜尾矿 La 黑麦草 耐性 积累 

分 类 号：X53[环境科学与工程—环境工程]