extremely significantP ≤ 0.001
tianguii (middle of Tiankeng, top of the Tiankeng, orchid garden), T test of Sobs index showed that the number of fungal OTUs observed in samples collected at orchid garden was higher than that at middle of Tiankeng and top of Tiankeng, and the difference was extremely significant (P ≤ 0.001 marked as * * *).