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2 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2 2012

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Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.)

Jakubowski M., Jelonek T.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 78

97--103

Coefficient of optimal structure in relation to wood density in Norway spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.). The aim of these study was to verify whether there is a relationship between the visual image of macrostructure expressed by COS and wood basic density in spruce and pine. Analyses were conducted on wood of wind-broken trees of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies Karst.). The coefficient of optimal structure (COS) shows high correlation with density in spruce and pine wood in the lower buttress section of the stem (at a height of 1.3 m - 4 m). Spearman’s correlation coefficients are around 0.7 - 0.8.In the upper part of the stem at a height o.

An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS)

Jakubowski M., Jelonek T.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2012

No. 78

92--96

An attempt at appraisal of softwood quality based on coefficient of optimal structure (COS). Visual characteristics of macrostructure may be simply correlated with different wood properties. There are some factors used to describes various macrostructure elements. In this work among selected parameters describing wood structure, a new parameter was propose. Parameter called the coefficient of optimal structure (COS) joint information on the proportions between early wood and latewood and on the mean width of annual rings. The described coefficient is easy to calculate and apply in the rapid analysis of softwood cross-section.