CK, non-managed Moso bamboo forest. IM6, IM10, IM15, and IM20 areMoso bamboo forests received 10, 15, 20, and 25 years of intensive management, respectively. Depth stands for soil depth with 0–20 cm and 20–40 cm soil layers. IMT stands for intensive management time. Shown are mean values and associated standard deviations. Different characters in a single column indicate significant difference between the treatments at P < 0.05.

Table 3 Correlation coefficients of environment factors with the biodiversity indices of cbbL and nifH genes (n = 3)