Fig. 1.

Rarefaction curve diagrams (a) and Veen diagram (b) of OTUs. a The abscissa represents the sequences randomly selected per sample, and the ordinate represents the number of OTUs found at the corresponding depth. The fatter the curve is, the more suficient the sequencing result; gcm 1–5, control groups 1–5, gmm 1–5 model groups 1–5. b OUT numbers. Red, the number of OTUs in gcm group; purple, the number of OTUs in gcm group