. 2018 Jul 19;9:1543. doi: 10.3389/fmicb.2018.01543

Table 2.

Effects of N and/or P addition on soil bacterial alpha diversity indices.

Treatment	OTUs	Pielou’ Evenness	Richness		Diversity

			ACE	Chao1	Shannon
CK	1102 ± 53^a	0.83 ± 0.02^a	1535 ± 61^a	1493 ± 109^a	5.75 ± 0.10^a
P	1123 ± 56^a	0.82 ± 0.01^a	1520 ± 35^a	1530 ± 25^a	5.77 ± 0.07^a
N	902 ± 36^b	0.81 ± 0.01^a	1304 ± 74^b	1170 ± 94^b	5.32 ± 0.19^b
NP	851 ± 104^b	0.82 ± 0.02^a	1332 ± 70^b	1213 ± 58^b	5.41 ± 0.09^b

OTUs, operational taxonomic units (97% similarity). Pielou’ Evenness: Pielou’ Evenness = H′/ln(S) where H′ is Shannon diversity and S is the total number of species in a sample. Based on Chao1 and abundance-based coverage estimator (ACE) richness indices. Based on Shannon diversity indices. Data are means ± standard deviation (n = 4). Different letters above columns indicate significant difference among fertilizer treatments (p < 0.05). CK, no fertilizer; P, phosphorus input; N, nitrogen input; NP, nitrogen and phosphorus input.