Figure 7 . Correlation between environmental factors and the top
20 most abundant bacterial communities at the phylum level. The X and Y
axes represent horizontal and vertical angular environmental factors
(species composition), respectively. HC, humus content; GS, specific
gravity of solid particles; AP, available phosphorus; TOC, total organic
carbon; SOM, soil organic matter; N, soil total nitrogen; C, soil total
carbon; NO3–N, nitrate-nitrogen; EC, soil electric
conductivity; TDS, total dissolved solid; AK, available potassium; SMC,
soil moisture capacity; AN, available nitrogen; NO2–N,
nitrite nitrogen; NH4–N, ammonium nitrogen. The red
shades represent positive correlation, and the blue shades represent
negative correlation. Darker shades represent stronger correlation.
(Depth and slope positon (n = 9), forest type (n = 12); *P< 0.05, **P < 0.01, ***P <
0.001.)