Fig 4 Observed plant-microbiota network structure for each main vegetation type sampled in this study. In each network of (a ) desert steppe (DS) (8 plants and 25 fungi), (b ) alpine meadow (AM) (21 plants and 118 fungi), and (c ) alpine steppe (AS) (28 plants and 138 fungi), (d ) desert steppe (DS) (13 plants and 139 bacteria), (e ) alpine meadow (AM) (21 plants and 84 bacteria), and (f ) alpine steppe (AS) (6 plants and 15 bacteria), fungi (yellow) and bacteria (purple) are linked with their host plants (green). The size of circles represents the degree of microbiota or plants in each network. A blue edge indicates a negative correlation, and a red edge indicates a positive correlation.