Developmental Trends of Black Spruce Fibre Attributes in Maturing Plantations

Table 2

Descriptive statistical summary of the mensurational characteristics of the 5 plantations and 47 sample trees.

Variable	Symbol	Unit	Mean	Standard error	Minimum	Maximum
Plantation level
Age at breast-height of dominant trees		yr	36	2	34	43
Quadratic mean diameter		cm	11.0	1.45	6.4	15.8
Mean dominant height		m	12.9	0.90	10.5	16.5
Site index		m	16.4	0.70	14.8	18.3
Density		stems/ha	3793	449	2076	5579
Basal area		m^2/ha	30.0	4.78	17.8	45.4
Total volume		m^3/ha	189.1	43.27	87.1	348.3
Merchantable volume		m^3/ha	125.9	44.97	18.6	292.8
Mean volume per tree		dm^3	60.2	21.30	15.6	146.4
Relative density index		%/100	0.76	0.075	0.51	1.02
Tree level
Breast-height age	A	yr	33	4	25	43
Height	H	m	10.9	1.03	6.7	17.9
Diameter at breast-height	D	cm	12.2	1.43	5.4	24.8
Maximum dead branch diameter		cm	1.3	0.09	0.5	2.2
Maximum live branch diameter		cm	1.5	0.10	0.1	2.5
Live crown ratio		%	59.4	4.91	37.2	96.7