Efficiency and mechanism of plant-microbial remediation for heavy metals and polycyclic aromatic hydrocarbons contaminated soils
In view of the prominent problems of chromium(Cr),arsenic(As)heavy(class)metals and polycyclic aromatic hydrocarbons(PAHs)such as phenanthrene(Phe)and Benzo[a]pyrene(BaP)in soils such as coking plants,and the lack of green and low-carbon remediation technologies,rye grass-maize-Rhodococcus aetherivorans(BW2)was utilized for plant-microbe co-remediation.The results show that Cr,As,Phe,and BaP concentrations in the soil of the combined remediation group decrease by 9.63%,5.28%,45.14%,and 26.87%,where the removal of heavy metals is largely dependent on plants,the removal of PAHs is largely dependent on microorganisms and their interactions with plants.Plants mainly absorb extractable heavy metals,and the exchangeable Cr in soil of different restora-tion groups decreases by 2.19% on average after 63 d,while the exchangeable As increases during the restoration process due to degrada-tion.The exchangeable Cr and carbonate-bound Cr are strongly positively correlated with actinomycetes in soil,while the two As forms are positively correlated with Bacteroidetes,Armatimonadetes,FBP and Planctomycetes.There is an obvious interaction between pollutant re-moval efficiency,and it is also affected by the dynamic abundance of enzyme activities and different functional microorganisms.In turn,soil microbial community structure and function also change under the comprehensive effect of soil pollutant types,concentrations and physical and chemical properties.
heavy metals-polycyclic aromatic hydrocarbonsco-contaminated soilRhodococcus aetherivoransrye grass-maizecombined remediation
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