Comparative analysis of taxonomic composition between the surface and subsurface samples
LEfSe analysis was used to reveal the significant different bacteria between the surface and subsurface samples (Fig. 6). In the surface sample, Pasteurellales (from order to family), the genus unclassified Lachnospiraceae and Actinobacillus were significantly enriched. In the subsurface samples, the familyNitrosomonadaceae , the genus Ellin6067, Entotheonellaeota(from phylum to genus), the family Paenibacillaceae , the genusDialister, and TK10 (from class to genus) were significantly enriched.