Figure 11. Redundancy analysis (RDA) ordination of microbial community function based on the specific activities of four soil extracellular enzymes (i.e. β-glucosidase, β-N–acetylglucosaminidase, phenol oxidase and peroxidase activities per soil microbial biomass).

Arrow length indicates the importance of each soil microbial community types and their relationship with soil microbial community function in plots of Q. aliena forest, mixed P. armandii/Q. aliena forest, Q. glandulifera forest, and Q. variabilis forest in mid-August 2012. (a) Grouping of soil microbial community types by conventional PLFA classification; (b) grouping of soil microbial community types based on the carbon sources they feed on. Sap, saprophytic fungi; G⁺, Gram-positive bacteria; G⁻, Gram-negative bacteria; AMF, arbuscular mycorrhizal fungi; Actino, actinomycetes; SB, soil bacteria group; RB, rhizospheric bacteria group. The vertical and horizontal bars show standard errors of means (n = 3).