Developmental Trends of Black Spruce Fibre Attributes in Maturing Plantations

Table 3

Statistical summary of the area-weighted fibre attribute values derived from the 47 breast-height cross-sectional sample disks at the time of sampling.

Variable	Symbol (nominal equivalent)	Unit	Mean	Standard error	Minimum	Maximum	CV (%)
Fibre length (weight-weighted)		mm	2.4	0.2	1.8	2.8	8.8
Wood density		kg/m^3	487.3	42.5	399.7	574.3	8.7
Microfibril angle	(MFA)	°	15.0	3.6	9.4	23.6	23.9
Modulus of elasticity	(MOE)	GPa	13.0	2.7	8.5	18.0	20.4
Coarseness		g/m	332.4	31.2	249.7	379.4	9.4
Wall thickness		m	2.3	0.2	1.9	2.6	7.9
Tracheid radial diameter		m	27.6	2.0	22.7	33.5	7.1
Tracheid tangential diameter		m	25.9	1.4	22.6	29.0	5.4
Specific surface area		m^2/kg	336.1	25.0	305.0	400.8	7.4

Coefficient of variation.