Table 2. DF, F values and P values from repeated measures ANOVA on the effects of warming (W), nitrogen (N), and measuring date (D), and their interactions on net ecosystem CO₂ exchange (NEE), ecosystem respiration (ER) and gross ecosystem productivity (GEP) for 2006, 2007, 2008 and 2009.

Source	DF	NEE		ER		GEP
		F Value	P	F Value	P	F Value	P
2006
W	1	1.111	0.323	0.662	0.44	2.124	0.183
N	1	20.964	0.002	4.712	0.062	29.271	0.001
D	5	21.606	0.002	293.997	<0.001	657.640	<0.001
W×N	1	3.680	0.091	5.572	0.046	0.001	0.979
D×W	5	4.454	0.068	1.577	0.189	3.657	0.008
D×N	5	7.644	0.024	6.321	<0.001	22.535	<0.001
D×W×N	5	114.223	<0.001	0.26	0.932	11.161	<0.001
2007
W	1	4.843	0.059	2.804	0.133	7.765	0.024
N	1	0.001	0.973	2.289	0.163	0.462	0.516
D	5	294.033	<0.001	254.932	<0.001	469.165	<0.001
W×N	1	2.336	0.165	3.140	0.144	0.309	0.594
D×W	5	20.692	<0.001	3.783	0.007	18.103	<0.001
D×N	5	17.465	<0.001	24.125	<0.001	24.722	<0.001
D×W×N	5	8.259	<0.001	10.506	<0.001	13.290	0.005
2008
W	1	28.119	0.001	22.054	0.002	1.078	0.329
N	1	34.156	<0.001	26.159	0.001	32.291	<0.001
D	5	153.749	<0.001	799.759	<0.001	681.520	<0.001
W×N	1	0.024	0.88	2.280	0.169	0.332	0.58
D×W	5	3.073	0.019	26.653	<0.001	7.977	<0.001
D×N	5	1.370	0.255	31.553	<0.001	10.691	<0.001
D×W×N	5	1.583	0.187	8.699	<0.001	3.126	0.018
2009
W	1	0.433	0.529	3.106	0.116	11.058	0.01
N	1	12.162	0.008	0.250	0.63	32.985	<0.001
D	5	512.464	<0.001	688.011	<0.001	1032.304	<0.001
W×N	1	3.430	0.101	0.028	0.871	6.839	0.031
D×W	5	6.154	<0.001	2.241	0.045	6.544	<0.001
D×N	5	37.015	<0.001	13.425	0.002	35.417	<0.001
D×W×N	5	21.219	<0.001	5.396	0.014	8.739	<0.001