摘要
以野生地被植物头花蓼为试验材料,采用温室盆栽法,对重金属Cd在该植物体内的吸收、累积分布以及迁移特性进行了初步研究。结果表明,Cd对头花蓼生长未造成显著影响,甚至低浓度(≤5mg.kg-1)Cd具有一定的生长促进作用,表现为植物的生物量增加。当Cd处理浓度达到50mg.kg-1时,植物的生物量虽有所降低,但与对照相比并无显著差异。植株不同部位对Cd的积累具有分异特性,地下部根系的累积量最大,叶次之,茎最小,且随处理浓度的增加而增加,在Cd处理浓度为50mg.kg-1时均达到最大值,分别为182.69、31.49mg.kg-1和10.34mg.kg-1。植株对Cd富集系数和转移系数分别为0.46～1.55和0.14～0.67,且地上部对Cd的最大迁移总量高达100.09μg.plant-1。说明头花蓼对修复Cd污染土壤具有一定的潜力,是一种修复Cd污染较好的景观地被植物种质资源。
By using wild groundcover plant— P.capitatum as the experiment material and the pot-culture method,this paper studied the absorption,accumulation and transference properties of heavy metal Cd in the plant.The results showed that Cd had no remarkable impact on the growth of P.capitatum,and even low concentration of Cd（≤5 mg.kg-1）could promote the growth,and increase the biomass.When the Cd concentration reached 50 mg.kg-1,the biomass had somewhat decreased but there was no distinctive difference comparing with the control.The different parts of the plant had a quite different accumulation amounts of Cd and the sequence was rootleafstem.The accumulation amount would increase as the increase of treatment concentrations of Cd in soils,and reached a peak at the Cd concentration of 50 mg.kg-1,the maximum quantity being 182.69 mg.kg-1 in root,31.49 mg.kg-1 in leaf and 10.34 mg.kg-1 in stem.The bioaccumulation coefficient of Cd was 0.46～1.55,and the translocation coefficient was 0.14～0.67 for Cd,and the largest total transference amount in shoot was up to 100.09 μg.plant-1.These suggested that P.capitatum had the potential to remediate Cd polluted soil.Therefore,it is a preferable germplasm resources of landscape groundcover plant for phytoremediation of Cd polluted soil.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2010年第11期2094-2099,共6页
Journal of Agro-Environment Science
关键词
头花蓼
CD污染
吸收
富集
Polygonum capitatum Ham ex D.Don
Cd pollution
absorption
accumulation
