TABLE 3.

ANOVA and ANOSIM results testing the amplicon pyrosequencing community UniFrac and Bray-Curtis dissimilarities between fuel categories and soil plots

Differences and testb	Pairwise test result	t/R statistic	P valuec
P1 differences between fuel categories (1-way ANOVA)	Global	17.4	0.006
	Control, high	8.0	0.009
	Control, med	5.5	0.026
	Control, low	4.2	0.032
	Low, high	5.5	0.027
	Low, med	1.9	0.241
	Med, high	3.8	0.044
P2 differences between fuel categories (1-way ANOVA)	Global	57.9	0.001
	Control, high	12.8	<0.001
	Control, med	9.7	0.001
	Control, low	4.7	0.016
	Low, high	11.4	<0.001
	Low, med	7.1	0.003
	Med, high	4.4	0.021
P3 differences between fuel categories (1-way ANOVA)	Global	213.6	<0.001
	Control, high	28	<0.001
	Control, med	19.4	<0.001
	Control, low	15.6	<0.001
	Low, high	17.4	<0.001
	Low, med	6.2	0.007
	Med, high	9.4	0.001
P4 differences between fuel categories (1-way ANOVA)	Global	278.5	<0.001
	Control, high	28.6	<0.001
	Control, med	13.1	<0.001
	Control, low	8.3	<0.001
	Low, high	28	<0.001
	Low, med	6.6	0.005
	Med, high	23.6	<0.001
Differences between plotsa (1-way ANOSIM)	Global	0.729	<0.001
	P1, P2	0.722	<0.001
	P1, P3	0.807	<0.001
	P1, P4	0.765	<0.001
	P2, P3	0.781	<0.001
	P2, P4	0.781	<0.001
	P3, P4	0.767	0.002

^aPlots include P1 (low-carbon soil), P2 (medium-carbon soil), P3 (high-carbon soil), and P4 (aged soil).

^bFuel categories refer to TPH concentrations. Unamended control, low TPH concentration (range of DL to 400 mg kg⁻¹), medium TPH concentration (range of 401 to 5,000 mg kg⁻¹), and high TPH concentration (>5,000 mg kg⁻¹).

^cSignificant differences are in bold. P values were considered significant at <0.05.