FIGURE 4.

Main factors mediating the relative contributions of stochastic and deterministic processes to bacterial and fungal community assembly. (A) Mantel correlograms of β-nearest taxon index (βNTI) against distance classes of key variables (i.e., pH for bacteria and TN for fungi) identified by mantel and partial mantel tests. Solid dots represent significant correlation at corresponding distance class. (B) Patterns of βNTI across different sub-groups along gradients of pH for bacteria and TN for fungi. Solid lines represent least-square regression with a second order term.