Figure 2 . General bacterial alpha diversity patterns. Boxplot
of alpha diversity indices, including community richness (Ace and Chao)
and diversity (Shannon and Simpson). Microbial alpha diversity in the
soil samples from different forest types (a), different depths (b), and
different slope positions (c). NA, C. oleifera new afforestation;
GLF, G. 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. OUT, operational taxonomic unit; ACE, abundance-based coverage
estimator. The data are represented as a box-and-whisker plot
representing median values with interquartile ranges. Different colors
indicate different sampling campaigns and sampling locations (depth and
slope positon n = 9forest type n = 12; *P < 0.05,
**P < 0.01, [Student’s t -test for
estimator]).