摘要
为0 mg/kg、2 mg/kg、4 mg/kg和20 mg/kg,在模拟温室条件下,分析了麦冬(Ophiopogon japonicus)、葱兰(Eephyranthes candi-da)和红花酢浆草(Oxalis rubra)3种地被植物及苇状羊茅(Festuca arundinacea)、草地早熟禾(Poa pratensis)、黑麦草(Loliumperenne)和白三叶(Trifolium repens)4种草坪草对土壤不同Cd含量的耐受性和生物积累。研究表明,除黑麦草生物量比对照组下降32%,其他植物均能耐受土壤Cd污染的环境,而黑麦草的生物量仍远大于其他3种草坪草。草地早熟禾对Cd的生物积累系数BAF最高,Cd质量比为2 mg/kg时,BAF为4.50;Cd质量比为20 mg/kg时,BAF为2.55。3种地被植物的BAF远小于4种草坪草。黑麦草是7种供试植物中Cd积累量最大的植物。3种地被植物的地下部对Cd的积累能力要强于地上部。
In order to explore the accumulative and transferable characteristics of Cd in green herbs,pot tests of Cd bioaccumulation with some herb species,including Ophiopogon japonicus,Eephyranthes candida,Oxalis rubra,Festuca arundinacea,Poa pratensis,Lolium perenne and Trifolium repens,were conducted under the simulated greenhouse conditions.Concentrations of Cd 0 mg/kg,2 mg/kg,4 mg/kg and 20 mg/kg were used in this study,base on the range of Cd concentrations in the soil along a highway.Results showed that plants were Cd tolerance and could grow normal except Lolium perenne dropped 32% than the control group.The biomass of Lolium perenne was greater than other turfgrasses.Poa pratensis had the highest Cd bioaccumulation factor,the BAF of Cd in the soil concentration of 2 mg /kg was 4.50,and it was 2.25 while the Cd concentrations in the soil reached 20 mg/kg.The BAF of ground cover plants was lower than turfgrasses.Lolium perenne could accumulate the most Cd in 7 plants.For ground cover plants,the bioaccumulation of Cd by the parts of underground was stronger than that by the parts of aboveground.
出处
《环境监测管理与技术》
2011年第4期22-26,共5页
The Administration and Technique of Environmental Monitoring
关键词
高速公路
草本植物
土壤污染
镉
生物积累
Highway
Herbaceous plants
Soil pollution
Cadmium
Bio-accumulation
