Within-stem variations in mechanical properties of Melia azedarach planted in northern Vietnam

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 6 Variance components for mechanical properties of Melia azedarach

Source of variation	df	MOR		MOE		E _d
Source of variation	df	p value	Var (%)	p value	Var (%)	p value	Var (%)
Site (S)	1	0.001	25.43	0.001	26.78	0.001	29.15
Tree/site (T/S)	4	0.862	0.55	0.013	5.12	0.001	6.78
Height level (L)	4	0.717	0.91	0.103	3.18	0.432	1.55
L × S	4	0.974	0.21	0.618	1.08	0.001	0.57
L × T/S	16	0.996	2.24	0.298	7.08	0.843	3.90
Radial position (P)	2	0.001	55.31	0.001	30.93	0.028	37.53
P × S	2	0.001	2.09	0.209	0.76	0.199	0.61
P × T/S	8	0.031	1.62	0.400	1.80	0.001	4.39
P × L	8	0.150	1.19	0.869	1.50	0.923	0.61
P × L × S	8	0.933	0.29	0.864	0.90	0.766	0.95
P × L × T/S	32	0.511	2.62	0.483	5.47	0.927	2.57
Residuals	90		7.53		15.4		11.40

MOR modulus of rupture, MOE modulus of elasticity, E_d dynamic modulus of elasticity, df degrees of freedom, Var variance (%)