Figure 4 . Bacterial community diversity assessments based on forest type (a), depth (b), and slope position (c) using the Kruskal–Wallis H test bar plot. The image represents the difference between proportions in 95% confidence intervals. “Unclassified” includes all unclassified species obtained directly from the database through sequence alignment. The X-axis represents the average relative abundance of different species, The Y-axis represents the species, and different colors indicate the different groups. NA, C. oleifera new afforestation; GLF,G. jasminoides in a low-yielding C. oleifera forest; LF, low-yielding C. oleifera forest; GNA, G. jasminoides inC. 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. Depth and slope position (n = 9), forest type (n = 12); *P < 0.05, **P < 0.01