Table 2. Two-way analysis of variance (ANOVA) of the influence of CO₂, nutrient supply, and their interactions on sessile oak saplings anatomical characteristics.

	CO2		Nutrition		CO2 × Nutrition
	F	p	F	p	F	p
Vessel diameter (μm)	8.06	0.006 ↑	0.34	0.560	0.42	0.519
VLA (μm2)	9.32	0.003 ↑	0.69	0.410	0.74	0.394
TVA (μm2)	0.56	0.455	0.34	0.560	1.49	0.226
PTVA (%)	0.56	0.459	0.58	0.450	0.25	0.621
Dhp (μm)	8.69	0.004 ↑	0.49	0.484	2.19	0.143
RW (μm)	8.31	0.005 ↑	0.50	0.483	0.02	0.891
BAI (mm2)	11.61	0.001 ↑	0.53	0.471	4.20	0.044
VD (No mm-2)	5.43	0.023 ↓	0.59	0.443	0.62	0.434
Ks (kg m-1 s-1 MPa-1)	0.46	0.499	0.13	0.722	0.40	0.531
Kring (kg m s-1 MPa-1)	7.88	0.007 ↑	0.55	0.461	2.44	0.123
Vulnerability index	14.57	0.001 ↑	1.73	0.192	1.27	0.263

VLA—Vessel lumen area; TVA—total lumen vessel area; PTVA—the proportion of the total vessel lumen area per analyzed sector; D_hp -hydraulic weighted diameter; RW—ring width; BAI—Basal area increment; VD—Vesel density; K_s—potential specific hydraulic conductivity; K_ring—potential hydraulic conductivity for a growth ring; Vulnerability index was calculated after Carlquist [65].

^↑—increase with eCO₂;

^↓—decrease with eCO₂.

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