. 2018 May 11;9:914. doi: 10.3389/fmicb.2018.00914

Table 1.

Alpha diversity indices of bacterial communities for each sample site.

Diversity metric	Fresh	Surface	Subsurface
Chao1	928.60 ± 103.40^a	900.13 ± 58.49^a	913.81 ± 85.75^a
Observed OTUs	624.80 ± 90.01^a	603.14 ± 34.79^a	609.84 ± 54.20^a
Faith’s Phylogenetic Distance	44.70 ± 6.97^a	43.45 ± 2.31^a	43.10 ± 3.58^a
Shannon	3.66 ± 0.21^a	3.35 ± 0.30^ab	3.03 ± 0.18^b
Simpson’s Evenness	0.0082 ± 0.0027^a	0.0064 ± 0.0013^a	0.0052 ± 0.0025^b

Values indicate mean ± 1 SD, and letters represent sample groupings based on similarity among the three treatments at the p ≤ 0.05 level.