Table 2. Alpha Diversity Analysis Indices at the OTU (Operational Taxonomic Unit) Level^a.

	community richness indices		community diversity indices
sample	Sobs	Chao1	Shannon	Simpson
control	360 ± 7	451 ± 49	4.04 ± 0.04	0.033 ± 0.002
0 h	348 ± 34	444 ± 10	3.74 ± 0.13	0.049 ± 0.011
4 h	266 ± 31*	327 ± 25**	3.33 ± 0.21***	0.075 ± 0.016***
24 h	396 ± 60	467 ± 52	4.00 ± 0.10	0.035 ± 0.007

^aNotes: One-way analysis of variance with Fisher’s least significant difference test compared with the control sample, *P < 0.05, **P < 0.01, and ***P < 0.001.