Figure 5 . Principal coordinate analysis (PCoA) of the soil bacterial community composition as affected by forest type (a), depth (b), and slope position (c), and based on the Bray–Curtis distance. Points of the same color belong to the same group, and soil group points that are the same are identified using ellipses. Abscissa represents the first principal component, ordinate represents the second principal component, and the percentage represents the contribution of the principal component to the sample difference. Box plots represent the discrete distribution of the different groups of samples along the PCoA1 axis and different colors represent the different sample groups. Values of R2 and P were calculated using analysis of similarities. NA, Camellia oleifera new afforestation; GLF,Gardenia jasminoides in a low-yielding C. oleifera forest; LF, low-yielding C. oleifera forest; GNA, G. jasminoidesin C. oleifera new afforestation. Twenty, soil layer at 0–20 cm depth; Forty, soil layer at 20–40 cm depth; Sixty, soil layer at 40–60 cm depth.