Table 1. Two-way analysis of variance (ANOVA) of the influence of CO₂, nutrient supply and their interactions on sessile oak saplings aboveground and belowground biometrical characteristics.

	CO2		Nutrition		CO2 × Nutrition
	F	p	F	P	F	p
Height (cm)	4.15	0.043 ↑	0.438	0.509	0.001	0.975
D0.05m (mm)	10.99	<0.001 ↑	0.28	0.596	1.54	0.215
CSA0.05m (mm)	13.92	<0.001 ↑	0.16	0.686	1.22	0.270
Leaf biomass (g)	6.22	0.014 ↑	0.16	0.691	0.03	0.862
Branch biomass (g)	4.67	0.033 ↑	0.03	0.857	0.02	0.893
Stem biomass (g)	7.77	0.006 ↑	0.77	0.381	0.18	0.673
Total aboveground biomass (g)	7.36	0.007 ↑	0.45	0.501	0.06	0.809
Fine root (≤2 mm) biomass (g)	25.03	<0.001 ↑	0.13	0.716	0.02	0.884
Coarse root (>2mm) biomass (g)	12.91	<0.001 ↑	1.67	0.198	0.77	0.382
Total belowground biomass (g)	14.65	<0.001 ↑	1.49	0.223	3.19	0.435
Total plant biomass (g)	11.58	<0.001 ↑	0.07	0.985	0.53	0.467
WD (g/cm3)	8.70	0.003 ↓	2.70	0.102	0.00	0.961
LA (m2/plant)	6.65	0.011 ↑	0.02	0.889	0.85	0.356
SLA (cm2 g-1)	14.37	<0.001 ↓	5.43	0.021 ↓	0.75	0.390

D_0.05m—diameter at 5 cm above ground; CSA_0.05m—cross-sectional area at 5 cm above ground; WD—wood density; LA—leaf area; SLA—Specific leaf area;

^↑—increase with eCO₂;

^↓—decrease with eCO₂.

Statistically significant effects and interactions are indicated in bold (p ≤ 0.05).