Table 2 Statistical analysis of the effects of, and interactions between N addition, warming, and present/absence of plant functional groups, i.e., shrubs and graminoids, on soil pore water dissolved organic carbon (DOC), total nitrogen (TN), C/N ratio, and SUVA₂₅₄ and a₂₅₄/a₃₆₅ of soil pore water DOC

Manipulated variables	Statistical parameters for dependent variables
	DOC			TN		C/N ratio		SUVA₂₅₄		a₂₅₀/a₃₆₅
	df	F	P	F	P	F	P	F	P	F	P
	n = 382			n = 382		n = 380		n = 317		n = 317
N added/no N added	1	0.08	0.78	17.6	< 0.001	20.7	< 0.001	0.05	0.83	0.18	0.67
Warmed/ambient temperature	1	4.50	0.04	0.31	0.58	0.14	0.71	3.23	0.07	1.76	0.19
Graminoid presence/absence	1	0.26	0.61	0.13	0.73	0.21	0.65	0.84	0.36	6.69	0.01
Shrub presence/absence	1	3.48	0.07	0.10	0.76	0.28	0.60	2.81	0.10	3.05	0.09
N added × warmed	1	0.39	0.54	0.54	0.47	0.34	0.56	1.54	0.22	0.31	0.58
N added × graminoids	1	0.17	0.68	1.75	0.19	1.21	0.28	0.13	0.72	0.42	0.52
N added × shrubs	1	1.04	0.31	0.01	0.91	0.34	0.57	0.08	0.78	0.04	0.85
Warmed × graminoids	1	0.00	1.00	1.77	0.19	1.69	0.20	0.002	0.96	0.75	0.39
Warmed × shrubs	1	0.24	0.63	0.43	0.52	1.84	0.18	0.05	0.83	1.85	0.18
Graminoids × shrubs	1	1.32	0.26	2.08	0.16	5.65	0.02	0.51	0.48	0.06	0.81
N added × warmed × graminoids	1	8.48	0.006	1.79	0.19	0.18	0.67	2.19	0.15	0.05	0.82
N added × warmed × shrubs	1	0.74	0.40	0.02	0.88	0.73	0.40	0.16	0.70	0.14	0.71
Warmed × graminoids × shrubs	1	2.40	0.13	0.02	0.88	0.56	0.46	2.41	0.13	0.60	0.44
N added × graminoids × shrubs	1	0.00	0.10	1.02	0.32	0.68	0.41	0.12	0.73	0.08	0.78
N added × warmed × graminoids × shrubs	1	0.47	0.50	0.12	0.73	0.04	0.85	0.46	0.50	0.02	0.89

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