Table 4. Summary of linear regressions describing the relationship between carbon flux component and soil water content (SWC), leaf area index (LAI) and the relationship between ecosystem respiration (ER) and gross ecosystem productivity (GEP).

		Treatment
		Control	Warming	Nitrogen	Warming×Nitrogen
NEE(umolCO2m−2s−1) vs.SWC(V/V%)	y-intercept	2.066	2.0044	1.594	2.7729
	slope	0.2365	0.261	0.3119	0.2496
	r2	0.4886	0.4659	0.4972	0.3402
	MS	314.90	316.75	689.63	313.74
	P	<0.0001	<0.0001	<0.0001	<0.0001
ER(umolCO2m−2s−1) vs.SWC(V/V%)	y-intercept	0.9146	0.6552	0.4292	−0.2314
	slope	0.2589	0.3416	0.3001	0.3913
	r2	0.5177	0.5662	0.5326	0.5317
	MS	377.32	542.41	638.37	771.08
	P	<0.0001	<0.0001	<0.0001	<0.0001
GEP(umolCO2m−2s−1) vs.SWC(V/V%)	y-intercept	3.0095	2.6596	2.0193	2.6494
	slope	0.4954	0.6026	0.6120	0.6364
	r2	0.5426	0.5815	0.5781	0.5000
	MS	1381.62	1688.15	2654.78	2039.59
	P	<0.0001	<0.0001	<0.0001	<0.0001
NEE(umolCO2m−2s−1) vs.LAI	y-intercept	0.5412	−0.2915	−4.2295	−1.3917
	slope	4.2316	4.6648	6.3741	4.4301
	r2	0.2792	0.5243	0.8201	0.7253
	MS	61.19	80.9279	264.93	42.2482
	P	0.0242	0.0007	<0.0001	<0.0001
ER(umolCO2m−2s−1) vs.LAI	y-intercept	−0.4930	0.4373	−1.6812	−1.4304
	slope	4.2868	3.3815	3.4772	3.7369
	r2	0.5325	0.3872	0.6059	0.5844
	MS	62.7906	42.5253	78.84	115.25
	P	0.0006	0.0058	0.0001	0.0002
GEP(umolCO2m−2s−1) vs.LAI	y-intercept	0.0482	0.1458	−5.9107	−2.8220
	slope	8.5184	8.0463	9.8513	8.1670
	r2	0.4024	0.5054	0.8241	0.6932
	MS	247.94	240.78	632.82	550.50
	P	0.0047	0.0009	0.0001	<0.0001
ER(umolCO2m−2s−1) vs.GEP(umolCO2m−2s−1)	y-intercept	−0.5914	−0.6659	−0.4017	−1.2563
	slope	0.5170	0.5503	0.4793	0.5700
	r2	0.9351	0.9119	0.8852	0.9108
	MS	713.26	902.39	1101.40	1383.80
	P	<0.0001	<0.0001	<0.0001	<0.0001