Modeling of radial variations of wood properties in naturally regenerated trees of Betula platyphylla grown in Selenge, Mongolia

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Statistical values of wood properties for the sampled trees

Property	Minimum	Maximum	Mean	SD
Annual ring width (mm)	0.87	1.75	1.37	0.25
WFL (mm)	0.93	1.21	1.03	0.09
VEL (mm)	0.55	0.71	0.61	0.05
BD (g/cm³)	0.45	0.61	0.55	0.05
AD (g/cm³)	0.58	0.75	0.64	0.05
DMOE (GPa)	7.84	13.50	11.20	1.95
MOE (GPa)	6.14	10.56	8.75	1.44
MOR (MPa)	63.2	109.8	85.8	14.6
U (kJ/m²)	49.0	92.2	72.3	16.8
CS (MPa)	36.9	50.3	43.5	4.7
SS (MPa)	7.7	11.8	9.4	1.3

Number of trees = 10. SD, standard deviation; WFL, wood fiber length; VEL, vessel element length; BD, basic density; AD, air-dry density after drying at around 22 °C and 65% relative humidity for 2 weeks (11.3 ± 0.5% of moisture content); DMOE, dynamic Young’s modulus; MOE, modulus of elasticity; MOR, modulus of rupture; U, absorbed energy in impact bending; CS, compressive strength parallel to grain; SS, shearing strength of small clear specimens. Mean values of moisture content of specimens were 10.7 ± 0.2%, 9.9 ± 0.3%, 10.7 ± 0.2%, and 10.1 ± 0.2% for static bending, impact bending, compressive strength, and shearing strength specimens, respectively