Figure 1

The compositions of soil microbial community at each vegetation successional stages in 0–10 cm and 10–20 cm depths in karst ecosystem. GL: grassland; SL: shrub land; SF: secondary forest; PF: planted forest; NF: natural forest; GP, Gram-positive bacteria; GN, Gram-negative bacteria; ACT, actinomycetes; AMF, arbuscular mycorrhizal fungi; F/B ratio, the fungi to bacterial ratio. (A) and (B) Representation of total PLFAs in 0–10 cm and 10–20 cm depths, respectively. (C) and (D) Representation of abundance of GP, GN and ACT in 0–10 cm and 10–20 cm depths, respectively. (E) and (F) Representation of abundance of AMF and 18: 1ω9c in 0–10 cm and 10–20 cm depths, respectively. (G) and (H) Representation of Fungi:Bacterial ratio. For the same parameter, histograms show the mean with SD bar, n = 3. Different litters indicate significant differences in the same soil depth (P < 0.05).