微生物对土壤Cd Pb和Zn生物有效性的影响研究

采用土壤盆栽模拟试验方法,研究了接种不同微生物对重金属富集植物——印度芥菜修复土壤中Cd、Pb、Zn的作用效果。结果表明,接入菌株JA27、JC55、JC40不仅显著促进植物的生长,提高印度芥菜的生物量,降低了土壤pH,并且对土壤Cd、Pb、Zn产生活化作用,使土壤Cd、Pb、Zn有效态含量显著增加,增强印度芥菜对土壤Cd、Pb、Zn吸收量,显著提高了富集植物的修复效果。以上3个处理使印度芥菜地上部Cd、Pb、Zn吸收量分别提高了117%～137%、37%～62%、9%～15.1%。接种JB37对土壤Cd、Pb、Zn产生钝化作用,并且抑制印度芥菜对土壤Cd、Pb、Zn的吸收。JB37处理印度芥菜地上部Pb、Zn吸收量分别降低了72.5%、27%,对Cd吸收量无显著影响。

Effects of Microorganisms on the Bioavailability of Cadmium,Lead and Zinc in Soil

The study was conducted to investigate the effects of microbial inoculation on bioavailability of Cd,Pb and Zn in soil when Brassica juncea as a hyperaccumulator growing using a pot experiment.The results showed that stains JA27,JC55 and JC40 not only promoted plant growth markedly and decreased soil pH,but also improved the bioavailability of Cd,Pb,Zn in the soil,which significantly enhanced the phy-toremeditation efficiency of three heavy metals eventually.Furthermore,the concentrations of Cd,Pb and Zn in shoot of Brassica juncea in-creased by 117% to 137%,37% to 62% and 9% to 15.1% when strains JA27,JC55 and JC40 inoculated in soil,respectively.However,stain JB37 inhibited Cd,Pb,Zn uptake from soil,and decreased the concentrations of Cd,Pb,Zn in Brassica juncea.The concentrations of Pb and Zn in shoot of Brassica juncea decreased by 72.5% and 27% in treatment of stain JB37 inoculation,but had no significant effect on Cd con-centrations.