五节芒(Miscanthus floridulus)不同种群对镉积累与转运的差异研究  

Accumulation and Translocation of Cd in Two Miscanthus floridulus Populations

作　　者：秦建桥[1,2] 夏北成[2] 赵鹏[2] 赵华荣[2] 谢国晖 

机构地区：[1]广东省环境科学研究院,广州510045 [2]中山大学环境科学与工程学院,广州510275 [3]广东省佛山市高明区环境保护监测站,广东佛山528500

出　　处：《农业环境科学学报》2011年第1期21-28,共8页Journal of Agro-Environment Science

基　　金：广东省自然科学基金团队项目(06202438);中山大学"985"工程环境污染控制与修复技术创新平台项目

摘　　要：采用盆栽试验的方法,对比研究了来源于大宝山矿区和惠州博罗非矿区的两个五节芒种群在不同Cd含量土壤中的生长反应、Cd富集能力及对土壤Cd形态的影响。结果表明,来源不同的两个五节芒(Miscanthus floridulus)种群植株对土壤中不同浓度的Cd的生长反应不同,低浓度Cd处理,非矿区种群的地上部生物量即受到显著影响,而矿区种群受到的影响不显著。Cd处理浓度提高时,非矿区种群的地上部生物量为对照的30.17%～42.07%,矿区种群地上部生物量为对照的57.80%～67.04%。非矿区种群根部生物量随处理浓度的增加而降低,为对照的57.75%-64.08%,而矿区种群显著升高,为对照的117.43%～135.56%。五节芒矿区种群地上部和根部的Cd含量随着土壤Cd处理浓度的升高而迅速升高,其升高速度明显快于非矿区种群。五节芒矿区种群根部积累的Cd总量远大于非矿区种群,且随着土壤中Cd添加量的增加而显著增加(P<0.05)。随着Cd胁迫程度的加重,五节芒两种群转移系数和耐性指数都有不同程度的下降,矿区种群的转移系数和耐性指数明显高于非矿区种群。Pearson相关性分析发现,五节芒根部生物量与地上部生物量极显著正相关,地上部生物量与根部和地上部Cd含量均呈极显著负相关关系,地上部Cd含量与根部Cd含量及转移系数(Translocation Factor,TF)均呈极显著正相关关系,耐性指数(Tolerant Index,TI)与根部和地上部Cd含量均呈极显著负相关关系,反映了根部和地上部Cd的累积对植物产生了毒性,并对五节芒的生长产生了抑制作用。矿区种群表现出对Cd更强的耐性以及富集作用。Growth responses to different Cd contamination levels in soil from 0 to 160 mg·kg-1 were different obviously between two Miscanthus floridulus populations,one was from mine site and other was from non-mine site.Compared to the mine population,the shoot biomass of the non-mine population decreased more significantly under Cd stresses.Under Cd treatment,the shoot biomass of mine and non-mine populations decreased to 57.80%～67.04% and 30.17%～42.07% of the CK,respectively.The root biomass of the mine population significantly increased to 117.43%～135.56% with the increasing Cd concentrations,while the root biomass of the non-mine population significantly decreased to 57.75%～64.08% compared with the control treatment.Compared to the non-mine population,the Cd concentration in shoot and root of the mine population increased more significantly with the increasing Cd concentrations.The Cd accumulation in shoot and root of the mine population was higher than the non-mine population under Cd stresses.The tolerance index and translocation factor of the mine population was higher than the non-mine population.Pearson correlation analysis found that root biomass and shoot biomass was significantly related.Cd concentration in shoot and root was significantly negative correlated with biomass and tolerant index（TI）,while significantly positively correlated with translocation factor（TF）.Cd stress inhibited the growth of Miscanthus floridulus.These results indicate that the mine population has an extraordinary ability to tolerate and uptake Cd from soil.

关 键 词：镉 五节芒 积累与转运 

分 类 号：X173[环境科学与工程—环境科学]