Fig. 4
Fit of the neutral community model (NCM) and null model of community assembly. a The predicted occurrence frequencies for bacterial, fungal, and protistan communities, respectively. The solid blue lines indicate the best fit to the NCM, and the dashed blue lines represent 95% confidence intervals around the model prediction. OTUs that occur more (blue color) or less (red color) frequently than predicted by the NCM are shown. Nm indicates the metacommunity size times immigration; R2 indicates the fit to this model. b Normalized stochasticity ratio of bacterial, fungal, and protistan communities in different sample groups. Different colors represent different altitudes (from H1 with red color to H8 with hot pink color). Each bar and error bar are the mean and standard deviation, respectively. Red dashed lines represent the 50% NST value, which is the cut-off value between stochastic and deterministic processes