Nitrogen deposition experiment mimicked with NH4NO3 overestimates the effect on soil microbial community composition and functional potential in the Eurasian steppe

Table 3 Percent changes in the relative abundances of bacterial phyla and C-decomposition gene categories under different N compound addition treatments when compared with the control

Bacterial phyla/gene categories	NH₄NO₃ (%)	Slow-released urea (%)	Urea (%)	NH₄HCO₃ (%)	(NH₄)₂SO₄ (%)
Actinobacteria	24.97	0.83	− 2.63	9.68	19.79
Acidobacteria	− 40.48	2.54	7.83	− 2.88	− 29.95
Alphaproteobacteria	34.66	0.52	− 0.02	5.87	22.81
Chloroflexi	− 30.27	− 8.54	− 11.01	− 10.09	− 23.36
Verrucomicrobia	− 43.85	17.99	9.26	− 31.72	− 14.36
Gemmatimonadetes	− 0.44	− 11.23	− 0.64	− 0.81	− 9.68
Bacteroidetes	2.54	− 11.12	− 7.62	− 4.54	− 14.37
Betaproteobacteria	17.38	− 1.01	10.11	− 4.70	− 14.60
Deltaproteobacteria	− 11.89	− 14.54	− 12.68	− 4.16	− 19.84
Planctomycetes	− 27.42	19.52	15.53	− 18.46	− 2.13
Nitrospirae	− 30.23	− 5.47	− 5.18	− 3.36	− 29.17
Other	7.81	− 6.35	3.07	1.39	19.58
Monosaccharides	− 0.22	− 1.25	− 0.82	0.01	1.66
Polysaccharides and disaccharides	6.87	3.65	1.83	5.27	8.36
Sugar acids and alcohols	0.71	0.36	0.99	0.21	2.24
Carboxylic acids	10.83	8.02	4.63	6.76	12.73
Cellulose,lignin and lipids	5.63	0.20	3.45	1.70	7.76
Phenolics	9.24	5.87	7.00	4.66	10.16
Other aromatics	6.33	2.70	3.28	2.57	8.21

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