Figure 4 Drivers of soil bacterial α-diversity across different compartments. Random forest (RF) analyses identifying the importance of potential predictors of fungal richness. RF Importance = Increase in % mean square error. Red and blue columns represent P < 0.05 and P > 0.05, respectively. Relationships between environmental factors and the bacterial α-diversity was estimated via linear least-squares regression analysis. Solid circle (red: dry season; blue: rainy season) indicate samples from Banna; Solid triangle (red: dry season; blue: rainy season) indicate samples from Hainan. P: phyllosphere, PE: leaf endosphere, S: soil, R: rhizosphere, RP: rhizoplane, RE: root endosphere, WC: Water content, N: Leaf nitrogen, P: Leaf phosphorus, K: Leaf potassium, LOM: Leaf organic matter, SOM: Soil organic matter, pH: Soil pH, AN: Ammonium nitrogen, NN: Nitrate nitrogen AP: Available phosphorus, AK: Available potassium, TN: Total nitrogen, TP: Total phosphorus, TK: Total potassium, Pre: Precipitation, Tem: Temperature.