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.