3.4 | Biotic and abiotic drivers for microbial community composition
In general, all examined biotic and abiotic variables, except for soil total phosphorus and soil pH, affected the composition of bacterial or fungal communities in both regions (Figure 5a). Moreover, among six variables with low collinearity, the rhizosphere bacterial composition was mainly affected by root total nitrogen and soil total nitrogen, whereas that in non-rhizosphere by soil available phosphorus (Figure 5b, c). In addition, soil available phosphorus was consistently the primary variable affecting the fungal composition in both rhizosphere and non-rhizosphere (Figure 5d, e).