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.