. 2017 Jul 24;8:1384. doi: 10.3389/fmicb.2017.01384

Table 1.

Values of the resistance index of functional gene abundances in the DD and ED treatments (means and standard errors, n = 4) in 2013 and 2014, respectively.

	Treatment		Sig. p-value	Archaeal amoA	nirK	nirS	nosZ
2013	DD	Precip-reduct	0.11	0.38(0.07)^a	-0.15(0.24)^b	0.45(0.50)^a	0.40(0.30)^ab
		Precip-add	0.51	0.60(0.36)^a	0.57(0.27)^a	0.32(0.28)^a	0.42(0.19)^a
	ED	Precip-reduct	0.07	-0.83(0.12)^a	-0.53(0.23)^b	-0.61(0.08)^ab	-0.59(0.13)^b
		Precip-add	0.22	0.17(0.69)^a	-0.37(0.21)^a	-0.48(0.15)^a	-0.34(0.10)^a
2014	DD	Precip-reduct	0.19	0.57(0.17)^a	0.28(0.28)^ab	0.12(0.38)^b	0.17(0.29)^b
		Precip-add	0.11	0.29(0.27)^ab	-0.32(0.24)^b	0.50(0.49)^a	0.46(0.50)^a
	ED	Precip-reduct	0.11	0.04(0.68)^a	-0.84(0.26)^b	-0.72(0.18)^ab	-0.61(0.37)^ab
		Precip-add	0.23	0.30(0.40)^a	0.05(0.04)^a	-0.46(0.75)^a	-0.15(0.26)^a

The differences of the resistance indices among the four genes were assessed by a one-way analysis of variance. Different lowercase letters indicate significant differences at p < 0.05. Abbreviations: DD, dryer dry season and wetter wet season; ED, extended dry season and wetter wet season; Precip-reduct, precipitation reduction; Precip-add, precipitation addition.