关键词: 植物修复, 杂草资源, 重金属, 污染土壤

Abstract: Phytoremediation of soils contaminated by heavy metals refers to the u tilization of some special plants to clean polluted environment through extracti on,volatilization,translocation and stabilization.The two main methods are phyto extraction and phytostabilization,i.e.,to remove heavy metals using hyperaccumul ators from contaminated soils or stabilize them by excluder plants in situ.At pr esent,phytoremdiation technologies are not successfully used in large,scale reme diative practice.The results partly lie in many disadvantages of the documented hyperaccumulators, such as small aboveground biomass,slow growth and long maturi ty phase.As for excluder plants, there are few materials published.With the prop erties of strong endurance to adverse environment,fast growing and high reproduc tion,especially the characteristics of the fast increase in biomass under feasib le environmental factors,weed can make good the defect or cover the shortage of the available remediation plants,so it is a kind of ideal remediative resource.B ased on our researches into phytoremediation,applications and screening methods of remediative weed plants were introduced,moreover,the dispose of remediative p lant biomass was also discussed.It was suggested that the comprehensive utilizat ion of weed plant resource would make a great progress in the remediation of soi ls contaminated by heavy metals.

Key words: phytoremediation, weed resource, heavy metal, contaminated soil