Fig. 4

Taxonomic classification of the microbial DNA sequences from soil communities in the MFCs at the phylum level for bacteria (a), fungi (b), and archaea (c); those at the class level distribution of the dominant bacterial phyla of Proteobacteria (d), Firmicutes (e), Bacteroides (f). CC represents the closed-circuit treatment without antibiotics added; CO and CN, respectively, represent the corresponding open-circuit and non-electrode treatments