FIGURE 4 Impacts of abiotic and biotic factors on bacterial and fungal richness in rhizosphere (Rs) and non-rhizosphere (Non-Rs) . SBI, shoot biomass; RBI, root biomass; RTC, root total carbon; RTN, root total nitrogen; STC, soil total carbon; STN, soil total nitrogen; STP, soil total phosphorus; SAN: soil available nitrogen; SAP: soil available phosphorus; SM: soil moisture. Overall R 2indicates the total explained fraction by the six variables.