Table 3. Results of PERMANOVA testing Au amendment, IT and field site on the microbial community structure in microcosm experiments.

Community structure	Bacteria			Fungi			Archaea
	CV (√)	Pseudo-F	P	CV (√)	Pseudo-F	P	CV (√)	Pseudo-F	P
Au	17.4	22.6	0.0001e	14.4	6.0	0.0001	18.4	3.9	0.001
SS	21.6	15.0	0.0001	33.9	12.6	0.0001	20.5	3.1	0.007
IT	11.2	7.5	0.0001	11.0	3.1	0.0001	15.7	2.3	0.02
Au × SSa	15.2	6.4	0.0001	18.7	3.8	0.0001	17.6	1.8	0.04
Au × ITb	7.7	2.4	0.0001	4.9	1.2	0.0828	−3.2	1.0	0.5
SS × ITc	9.6	2.6	0.0004	13.5	2.0	0.0001	−7.7	0.9	0.6
Au × SS × ITd	8.4	1.6	0.0025	13.4	1.5	0.0001	′	2.4	0.004
Residual	19.4			33.6			43.4

Abbreviations: AU, gold amendment; IT, incubation time; PERMANOVA, permutational multivariate analysis of variance; SS, sampling site.

^aInteractive effect of Au and SS.

^bInteractive effect of Au and IT.

^cInteractive effect of SS and IT.

^dInteractive effect of Au, SS and IT.

^eSignificance level to assess the criteria was P<0.05 (in bold).