Fig. 4

Venn diagram showing the numbers of unique and shared OTUs between compartment niches, and the percentage of these OTUs accounting for the total number of OTUs shown in parenthesis (a). The potential sources of bacterial communities based on OTUs level [b rhizosphere soil and leaf endosphere as the potential source of root endosphere; c rhizosphere soil and root endosphere as the potential source of leaf endosphere]. GTZ, MR, and AM represent the glacier terminus zone, moraine ridge, and alpine meadow, respectively. Bars without shared letters indicate significant differences (Kruskal–Wallis test: P < 0.05)