Table 2. Mean relative abundance of the 10 most abundant taxa at the phylum level.

Sample group	Top 10 abundant phyla (%)
SCT	Firmicutes (47.56)
	Bacteroidota (21.89)
	Actinobacteriota (14.35)
	Proteobacteria (10.84)
	unclassified_k__norank_d__Bacteria (2.22)
	Desulfobacterota (2.00)
	Patescibacteria (0.31)
	Fusobacteriota (0.15)
	Cyanobacteria (0.12)
	Chloroflexi (0.09)
SCB	Firmicutes (43.91)
	Bacteroidota (26.56)
	Proteobacteria (13.88)
	Actinobacteriota (9.50)
	Desulfobacterota (3.67)
	Patescibacteria (0.52)
	Spirochaetota (0.44)
	Verrucomicrobiota (0.28)
	Synergistota (0.24)
	Planctomycetota (0.22)
GCT	Firmicutes (72.48)
	Bacteroidota (15.74)
	Actinobacteriota (6.50)
	Proteobacteria (2.58)
	Desulfobacterota (2.30)
	Patescibacteria (0.16)
	unclassified_k__norank_d__Bacteria (0.07)
	Synergistota (0.05)
	Spirochaetota (0.03)
	Campilobacterota (0.02)
GCB	Firmicutes (35.22)
	Actinobacteriota (20.17)
	Proteobacteria (18.79)
	Bacteroidota (14.52)
	Patescibacteria (3.23)
	Desulfobacterota (3.13)
	Chloroflexi (1.22)
	unclassified_k__norank_d__Bacteria (1.07)
	Acidobacteriota (0.49)
	Spirochaetota (0.33)