Table 2: Diversity estimation of the 16S rRNA gene libraries for the R- and S-samples.

SampleOTU numberChao 1 indexShannon indexSimpson index
RSRSRSRS

L2007 ± 2751492 ± 2748704 ± 5826947 ± 14647.41 ± 0.785.51 ± 1.200.96 ± 0.020.86 ± 0.08
M1986 ± 2681618 ± 2469759 ± 17506557 ± 6857.34 ± 0.855.70 ± 0.900.96 ± 0.030.86 ± 0.07
H2089 ± 2021698 ± 2518338 ± 4077234 ± 8597.85 ± 0.716.50 ± 1.030.97 ± 0.020.91 ± 0.04

R: root samples; S: substrate samples; L: low influent TAN concentration group (0.75 mg/L); M: middle influent TAN concentration group (2.31 mg/L); H: high influent TAN concentration group (7.23 mg/L). Differences among the L, M, and H groups were tested using one-way ANOVA. Different characters indicate significant differences (). Differences between the R- and S-samples of each group were determined using Student’s -test. “” and “” indicate significant differences () (means ± SD, ).