Figure 4. The extent of overlap of phyllosphere microbiome among three locations (A), (B), (E), (F) and among five tree species (C), (D), (G), (H), respectively.

At the level of (A), (C), (E), and (G) OTUs clustered at 3% difference; (B), (D), (F), and (H) functional KOs by Tax4Fun and guilds by FUNGuild. The abbreviations of study sites and plant species are as follows: LDU, Yuzhong campus of Lanzhou University in Lanzhou city; MJS, a site in the Xinglongshan forest in Majiasi; XLS, Xiaolongshan forest farm in Tianshui City. PA, Picea abies; PC, Picea crassifolia; PK, Picea koraiensis; PL, Picea likiangensis var. rubescens; PW, Picea wilsonii.