Table 4. Effect of shrub coverage on relative abundances (%) of the top 10 predominant bacterial phyla in ruminal samples of yaks grazing in alpine meadows

Item	Shrub coverage				SEM	p-value
Item	Control	Low	Middle	High	SEM	p-value
Firmicutes	39.40^b	43.05^b	47.35^ab	54.78^a	4.989	0.001
Bacteroidetes	49.77^a	44.69^ab	42.48^ab	38.87^b	3.673	0.046
Spirochaetes	1.73	2.65	2.06	1.26	0.192	0.282
Cyanobacteria	1.94^a	1.48^ab	1.27^ab	0.87^b	0.138	0.043
Proteobacteria	1.42	1.18	1.22	1.18	0.117	0.126
Fibrobacteres	0.86^b	2.11^a	1.17^b	0.38^b	0.043	0.024
SR1	0.99	0.96	1.54	0.90	0.109	0.126
Tenericutes	0.91^b	1.68^a	0.56^b	0.36^b	0.051	0.042
Verrucomicrobia	0.73^a	0.39^b	0.42^b	0.22^b	0.043	0.033
Saccharibacteria	0.45	0.51	0.31	0.28	0.032	0.212
Firmicutes:Bacteroidetes	0.81^b	0.96^b	1.14^ab	1.44^a	0.083	0.028

Values within a row with different superscripts differ significantly at p < 0.05.
SEM, standard error of the mean.