Table 1. Diversity indices based on the 16S rRNA gene sequences from the five geographically distributed soils contaminated with different levels of arsenic.

See Fig 1 caption for the soil codes.

Soil ID	No. of sequencesa	Richnessb	Evennessc	Hd
B1	28450±17842a	2966±69a	0.92±0.00a	7.39±0.04a
B2	22440±7748a	2888±102a	0.92±0.00a	7.36±0.05a
C1	31263±17284a	2717±4a	0.89±0.00b	7.09±0.01b
C2	20162±10758a	2345±92b	0.88±0.00c	6.81±0.05c
UK	29692±16741a	1757±127c	0.86±0.01d	6.44±0.09d

Note: Means ± SD in columns followed the same letter(s) are not statistically significant at 5% significance level.

^a Detected sequence number.

^b Detected OTU number.

^c Evenness index.

^d Shannon-Wiener index: higher numbers represent higher levels of diversity.