Table 2. Results (F and P values) of a three-way ANOVA on the effects of year (Y), nitrogen addition (N), water addition (W), and their interactions on aboveground biomass (AGB, g m^-2), net ecosystem CO₂ exchange (NEE, μmol m^-2 s^-1), ecosystem respiration (ER, μmol m^-2 s^-1), and gross ecosystem productivity (GEP, μmol m^-2 s^-1).

		AGB		NEE		ER		GEP
	df	F	P	F	P	F	P	F	P
Y	2	1.11	0.42	5.55	0.18	10.05	0.11	10.18	0.13
N	1	42.37	0.02	33.90	0.03	71.88	0.01	55.45	0.02
W	1	0.62	0.52	8.01	0.11	0.45	0.57	1.37	0.36
Y × N	2	33.00	0.03	9.69	0.09	1.24	0.45	2.03	0.33
Y × W	2	16.58	0.06	0.26	0.80	2.77	0.27	1.29	0.44
N × W	1	6.02	0.13	0.44	0.57	0.06	0.83	0.26	0.66
Y × N × W	2	0.48	0.62	2.83	0.07	10.82	<0.01	11.51	<0.01

The bold numerals highlight significance at the P < 0.05 level.