Fig. 4

Phylogenetic tree of all samples based on GraPhlAn. The phylogenetic tree showed the hierarchical relationship of all taxonomy units (represented by nodes) from phylum to genus (arranged from the inner circle to the outer circle sequentially) in all samples. The size of the nodes corresponded to the average relative abundance of the taxonomy. The top 20 taxonomy units will also be identified by letters in the graph. From the outer layer to the inner layer, the shadow color on the letter is the same as the color of the corresponding node