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The buried China-Russia Crude Oil Pipeline (CRCOP) across the permafrost-associated cold ecosystem in northeastern China carries a risk of contamination to the deep active layers and upper permafrost in case of accidental rupture of the embedded pipeline or migration of oil spills. As many soil microbes are capable of degrading petroleum, knowledge about the intrinsic degraders and the microbial dynamics in the deep subsurface could extend our understanding of the application of  in-situ  bioremediation. In this study, an experiment was conducted to investigate the bacterial communities in response to simulated contamination to deep soil samples by using 454 pyrosequencing amplicons. The result showed that bacterial diversity was reduced after 8-weeks contamination. A shift in bacterial community composition was apparent in crude oil-amended soils with  Proteobacteria  (esp.  α- subdivision) being the dominant phylum, together with  Actinobacteria  and  Firmicutes . The contamination led to enrichment of indigenous bacterial taxa like  Novosphingobium ,  Sphingobium ,  Caulobacter ,  Phenylobacterium ,  Alicylobacillus  and  Arthrobacter , which are generally capable of degrading polycyclic aromatic hydrocarbons (PAHs). The community shift highlighted the resilience of PAH degraders and their potential for  in-situ  degradation of crude oil under favorable conditions in the deep soils.

plos one

Crude Oil Treatment Leads to Shift of Bacterial Communities in Soils from the Deep Active Layer and Upper Permafrost along the China-Russia Crude Oil Pipeline Route