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Lula, Mikolaj, 2016. Knots properties of lodgepole sawn boards from unthinned stands planted in different initial spacings : case study from northern Sweden. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre

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Abstract

The objective of this study was to assess quality of lodgepole pine (Pinus contorta Dougl. var. latifolia) sawn boards derived from stands established in four different initial densities i.e. 1.1 m x 1.1m, 2.0 m x 2.0 m, 2.85 m x 2.85 m, 4.0 m x 4.0 m. The logs were extracted from unthinned plots that were 44-years-old growing in northern Sweden. The quality was assessed in respect to knots properties as knot size, knots number, position on the board, living status of the knot ect. It was found that wood quality regarding mean knot size and knot are ratio (KAR) was decreasing with growing space availability. There were no differences between spacings in terms of knot frequency. There was also no evidence of differences in knot type variation between the treatments. Thus, conventional spacing of 2.0 m x 2.0 m (2500 seedlings ha⁻¹) seems to be a reasonable compromise between timber quality, economics and growth. However, there is a potential to decrease planting densities without depreciation of knots parameters.

Main title:Knots properties of lodgepole sawn boards from unthinned stands planted in different initial spacings
Subtitle:case study from northern Sweden
Authors:Lula, Mikolaj
Supervisor:Liziniewicz, Mateusz and Säll, Harald
Examiner:Ekö, Per Magnus
Series:Examensarbete / SLU, Institutionen för sydsvensk skogsvetenskap
Volume/Sequential designation:266
Year of Publication:2016
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SM001 Euroforester - Master's Programme 120 HEC
Department:(S) > Southern Swedish Forest Research Centre
Keywords:timber quality, lodgepole pine, initial spacing, knot properties, Pinus contorta, planting density
URN:NBN:urn:nbn:se:slu:epsilon-s-5836
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-5836
Subjects:Processing of forest products
Language:English
Deposited On:20 Sep 2016 12:12
Metadata Last Modified:20 Sep 2016 12:12

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