5种草本植物对重金属的吸收与富集作用

根据野外试验采样调查研究,通过5种植物对江西定南县钨矿废渣地土壤的重金属含量的吸收试验,定量分析矿区狗牙根(Cynodondactylon)、弯叶画眉草(Eragrostiscurvula)、百喜草(Paspalumnotatum)、多花木兰(Indigoferaamblyantha)、高羊茅(Festucaarundinacea)5种草本植物对钨矿废渣地重金属As、Zn、Cu的吸收与富集作用各有特点.结果表明:①钨矿废渣地受到As、Zn、Cu的污染严重,狗牙根等植物对As、Zn、Cu作用均有着不同程度的富集;②不同植物类型对重金属吸收与富集作用因重金属种类、植物类型和部位的不同而各异,植物根部对As和Cu的富集作用比根部以上(地上部分)突出,而对Zn相反;③多花木兰地上部分生物量最大,对污染土壤的生物净化能力比其他植物更显著.

Absorption and accumulation of heavy metals by 5 herbaceousSplants

On the basis of field investigation, by experimenting on the amount of heavy mentals absorbed by 5 species of herbaceousSplants in Tungsten slag in Dingnan county of Jiangxi Province. We give quantitative analysis of the effect of absorption and accumulation of heavy metals, Arsenic(As), Zinc(Zn) and Copper(Cu) by the 5 herbaceousSplants atSthe mine, the plants are as follows: Cynodon dactylon , Eragrostis curvula, Paspalum notatum, Indigofera amblyantha, Festuca arundinacea. And the result turns to be that:(1) the Tungsten slag was heavily polluted by heavy metals As, Zn and Cu, herbs like Cynodon dactylon and so on each has different levels of absorption of heavy mentals,As,Zn,Cu;(2) different kinds of the plant do different in absorbing heavy mentals due to different part of herbs and different elements of heavy mentals. The roots are much more outstanding in absorbing than the aboveground part, except absorption of Zn.(3) Indigofera amblyantha has the most biomass and does the best in absorbing heavy mentals among the 5 plants.