Node frequency alters stem biomechanics and hydraulics in four deciduous woody species

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Means (± 1 SE) for the biomechanical and hydraulic traits measured across four species, including the frequency of nodes, modulus of elasticity (MOE), modulus of rupture (MOR), stem density, and xylem-specific hydraulic conductivity (K_s)

Species		n	Nodes (# m⁻¹)	Specific MOE (N mm⁻²)	Specific MOR (N mm⁻²)	Stem density (g cm⁻³)	K_s (kg s⁻¹ MPa⁻¹ m⁻¹)
Juglans californica S. Watson (Juglandaceae)	Jc	36	60.42 ± 5.34^A	5156 ± 254^C	85.02 ± 3.61^B	0.4712 ± 0.008^C	0.998 ± 0.123^B
Populus trichocarpa Hook. (Salicaceae)	Pt	36	27.36 ± 1.94^B	5310 ± 316^C	80.71 ± 4.35^B	0.5689 ± 0.014^B	2.009 ± 0.146^A
Quercus robur L. (Fagaceae)	Qr	36	56.25 ± 4.74^A	9138 ± 547^B	134.76 ± 6.94^A	0.6575 ± 0.014^A	1.076 ± 0.146^B
Rhus aromatica Aiton (Anacardiaceae)	Ra	36	37.40 ± 1.81^B	11,689 ± 917^A	147.84 ± 10.80^A	0.5019 ± 0.011^C	0.269 ± 0.046^C

The sample size is also included (n). There were significant differences between species in their node number (F_3,140 = 16.85, P < 0.001), MOE (F_3,140 = 30.76, P < 0.001), MOR (F_3,140 = 23.79, P < 0.001), stem density (F_3,140 = 46.41, P < 0.001), and K_s (F_3,140 = 34.14, P < 0.001). Different letters following values within in a column indicate significant differences among species