Table 1. DF, F values and P values from three-way ANOVA on the effects of warming (W), nitrogen (N), and year (Y), and their interactions on net ecosystem CO₂ exchange (NEE), ecosystem respiration (ER) and gross ecosystem productivity (GEP).

Source	DF	NEE		ER		GEP
		F Value	P	F Value	P	F Value	P
W	1	5.21	0.0151	5.56	0.0251	0.29	0.5935
N	1	42.53	<0.0001	14.74	0.0006	77.27	<0.0001
Y	3	8.03	0.0004	47.28	<0.0001	53.73	<0.0001
W×N	1	1.36	0.2522	0.93	0.3425	2.90	0.0990
Y×W	3	6.67	0.0014	4.22	0.0133	8.87	0.0002
Y×N	3	4.96	0.0065	1.38	0.2682	5.94	0.0026
Y×W×N	3	4.15	0.0143	2.89	0.0518	0.70	0.5615