4种植物对铅、镉和砷污染土壤的修复作用研究

通过盆栽试验从野生和栽培的植物中筛选具有吸收重金属Cd、As和Pb的超富集植物。结果表明,重金属Cd、As和Pb处理对所选的4种植物的株高均无显著影响,但显著降低皱叶狗尾草和百喜草的生物量,As胁迫显著降低辣蓼的生物量。4种植物地上部重金属含量均未超过临界指标含量,其中辣蓼地下部Cd含量、香根草地下部Pb含量和皱叶狗尾草地下部Pb含量超过临界指标含量,具有修复污染土壤的潜能。

Phytoremediation Effects of Four Plants on Contaminated Soils by Heavy Mental Lead,Cadmium and Arsenic

A pot experiment was develop to screen hyperaccumulator which can extract heavy metal lead,cadmium and arsenic from contaminated soils in the wild and cultivated plants. The experiment showed that of four plants hadn't be significant affected by heavy metals, however the biomass of winkledleaf bristlegrass and bahia grass was decreased significantly, the biomass of polygonum hydropiperl had the same result by arsenic. The heavy metal content of four plants above-ground part didn′t exceed critical values, however there of lead in under-ground part of winkledleaf bristlegrass and vetiver grass and that of cadmium in under-ground of polygonum hydropiperl were exceed critical values. Our results indicate polygonum hydropiperl, winkledleaf bristlegrass and vetiver grass have phytoremediation potential.