Effect of Phosphate-Solubilizing Bacteria Combined with Green Activator on Accumulation/Translocation of Cadmium in Soil by Ryegrass
With orange residue extract and tetrasodium glutamate diacetate(GLDA)as raw materials,a green activator was prepared.Then,the effects of phosphate-solubilizing bacteria(PSB)combined with green activator on the enrichment,translocation and accumulation of cadmium from soil by ryegrass were studied.The results show that PSB can significantly promote the growth of ryegrass in cadmium-contaminated soil.However,the growth of ryegrass is inhibited by only using green activator,with the dry weight of ryegrass at the end of experiment decreased by 27.37％;while a combination of PSB and green activator can make the final dry weight of ryegrass become 1.29 times that in the blank group,indicating that the addition of PSB can alleviate the negative effect of green activator on the growth of ryegrass.A combination of both can increase the content of phytoavailable cadmium in soil,while decrease the total cadmium concentration in soil.It is shown that the enrichment coefficient of Cd in stem and root parts of ryegrass increases by 35.37％and 10.23％,respectively,and the translocation factor of cadmium by ryegrass increases by 22.58％.In addition,the total accumulation of cadmium in the stem and root parts of ryegrass is up by 87.90％and 32.69％,respectively.It is found that the total accumulation of cadmium in the stem is all greater than that in the root whether by using PSB and green activator separately,or by a combination of both,indicating that PSB combined with green activator can promote the phytoextraction efficiency of cadmium from soil by ryegrass.
heavy metal contaminated soilsoil bioremediationcadmiumplant extractionphosphorus-solubilizing bacteriaactivatorryegrass
万方数据
维普
