Table 1 Results of ‘envfit’ applied to ordination of microbial communities within each habitat-depth subset.

Marker	Variable	Bog- 5 cm		Bog- 20 cm		Fen- 5 cm		Fen-20 cm
Marker	Variable	R²	p	R²	p	R²	p	R²	p
16S rRNA gene	Core	0.71	0.001**	0.27	0.002**	0.07	0.2	0.14	0.04*
	pH	0.02	0.6	0.03	0.5	0.36	0.001**	0.12	0.045
	Phenol	<0.01	0.9	0.03	0.5	0.22	0.005**	0.35	0.001**
	P-Ox	0.14	0.024*	0.17	0.01*	0.02	0.6	0.05	0.3
	%Moss	0.23	0.002**	0.41	0.001**	0.08	0.1	0.23	0.002**
	%Grasses	0.17	0.017*	0.30	0.001**	0.20	0.006**	0.50	0.001**
	%Shrubs	0.59	0.001**	0.11	0.052	NA	NA	NA	NA
	CO₂	0.12	0.048*	0.11	0.058	0.02	0.6	0.15	0.02*
	CH₄	0.04	0.3	0.0174	0.6	0.04	0.4	0.07	0.2
18S rRNA gene	Core	0.04	0.4	<0.01	0.8	0.05	0.3	0.17	0.008**
	pH	<0.01	1	<0.01	0.9	0.01	0.7	0.27	0.001**
	Phenol	0.11	0.07	0.2	0.005**	0.10	0.06	0.20	0.006**
	P-Ox	0.05	0.3	0.04	0.4	0.05	0.3	0.19	0.009**
	%Moss	<0.01	0.8	0.01	0.7	0.08	0.1	0.27	0.001
	%Grasses	0.02	0.7	0.05	0.3	<0.01	0.9	0.03	0.5
	%Shrubs	0.05	0.3	0.08	0.1	NA	NA	NA	NA
	CO₂	0.03	0.4	0.01	0.8	0.04	0.4	0.08	0.10
	CH₄	<0.01	0.8	0.05	0.3	0.05	0.3	<0.01	0.9

Significant p-values are denoted by *(p < 0.05), **(p < 0.01), and ***(p < 0.001). OTUs assigned to the following phyla were excluded from the 18 S rRNA dataset prior to analysis: Holozoa, Metazoa, Chloroplastida and ‘NA’. Phenol = concentration of phenolic compounds; P-Ox = phenol oxidase activity; %Moss = percentage cover of mosses; %Grasses = percentage cover of graminoids; %Shrubs = percentage cover of shrubs; CO₂ = carbon dioxide flux; CH₄ = methane flux.

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