Sample overlap was assessed to identify shared diversity among the six samples (Fig. 2c–d). A total of 71 bacterial operational taxonomic units (OTUs) were shared among samples (a total richness of 6,072 OTUs). Additionally, the six samples shared four fungal OTUs out of a total fungal richness of 280 OTUs. These results indicated that microbial communities overlapped to some extent among different sampling sites. This was particularly evident for fungal communities, in which Fusarium was the major genus and comprised a major proportion of all communities.