龙须草对镉的耐受性和富集特征  

Cadmium tolerance and enrichment characteristics of Eulaliopsis binata

作　　者：刘爱中[1,2] 邹冬生[1] 刘飞[1] 

机构地区：[1]湖南农业大学生物科学技术学院生态研究所,长沙410128 [2]湖南人文科技学院,湖南娄底417000

出　　处：《应用生态学报》2011年第2期473-480,共8页Chinese Journal of Applied Ecology

基　　金：国家"十一五"科技支撑计划项目(2007BAD87B11;2008BADA7B07);湖南省林业厅重点项目(62020608001);湖南省科技厅计划项目(S2006N332);湖南省稳定人才科学基金项目(09DW28)资助

摘　　要：利用盆栽试验,研究了龙须草对Cd的耐受能力和富集特征.结果表明:低浓度Cd处理(5 mg·kg-1)能促进龙须草的生长,增强其生理活性,生物量、净光合速率等12个指标比对照提高1.0%～15.5%;高浓度Cd处理(>5 mg.kg-1)对龙须草的生长产生抑制作用,但当Cd浓度达到100 mg.kg-1时,龙须草仍能完成正常的生理周期,生物量、净光合速率仅比对照分别下降27.0%和25.6%.龙须草各器官的Cd含量随Cd污染程度的上升而大幅度增加,根的Cd含量为350～500 mg.kg-1,茎叶为15～35 mg·kg-1.在Cd浓度<50 mg·kg-1时,吸Cd量随添加浓度的增大而增大,茎叶吸Cd量占总吸Cd量的15.7%～38.4%,茎叶与根的吸Cd量比值最高可达0.62.龙须草对Cd污染的耐受性、富集和转运能力均较强,是一种潜在的Cd超富集植物.A pot experiment was conducted to study the cadmium（Cd） tolerance and enrichment characteristics of Eulaliopsis binata.Applying low concentration Cd（5 mg·kg-1） could boost the growth and physiological vigor of E.binata,with the twelve indexes such as biomass and net photosynthetic rate,etc.increased by 1.0%-15.5%,compared with CK;while applying high concentration Cd（5 mg·kg-1） had negative effects on the growth of E.binata.Even though the E.binata still finished its physiological circle under the application of 100 mg Cd·kg-1,the biomass and net photosynthetic rate were decreased by 27.0% and 25.6%,respectively,in comparison with CK.The Cd content in the organs of E.binata increased greatly with increasing concentration of applied Cd.The Cd content in roots was from 350 mg·kg-1to 500 mg·kg-1,and that in stems and leaves was from 15 mg·kg-1 to 35 mg·kg-1.When the concentration of applied Cd was 50 mg·kg-1,the Cd uptake by E.binata increased with increasing concentration of applied Cd.The Cd content in stems and leaves amounted 15.7%-38.4% of the total uptake,and the ratio of the Cd content in stems and leaves to that in roots was up to 0.62.All the results indicated that E.binata had stronger capability in tolerating,enriching,and transporting Cd,being a potential Cd hyperaccumulator.

关 键 词：CD 耐受性 富集特征 龙须草 

分 类 号：X173[环境科学与工程—环境科学]