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Influence of spacing and thinning on wood properties in conifer plantations

Liziniewicz, Mateusz (2014). Influence of spacing and thinning on wood properties in conifer plantations. Diss. (sammanfattning/summary) Alnarp : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:96
ISBN 978-91-576-7930-7
eISBN 978-91-576-7931-4
[Doctoral thesis]

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As reported in four appended papers (I-IV), effects of genotype (half-sib family) and initial spacing (I) or initial spacing (II) and various thinning methods (III & IV) on stands and properties of sawn-products were investigated in Scots pine (I & IV), lodgepole pine (II) and Norway spruce (III) stands in southern Sweden. Most of the analysed growth parameters were found to be affected by interaction between genotype and initial spacing, but the treatments had no significant interactive effects on most quality parameters (I). Very wide initial spacing (4x4 m, 625 trees/ha⁻¹) was found to negatively affect most growth and quality properties of lodgepole pine. Differences in effects of the density currently used in forestry (2500 trees/ha⁻¹) and a tested density (1100 trees/ha⁻¹, 3x3 m), were quite small, but increasing the spacing decreased frequencies of potential high quality trees. The results indicate that Scots pine and lodgepole pine have similar volume production rates and external quality traits (II). External properties of trees in the stands, particularly stem straightness and frequencies of quality defects (e.g. spike knots), were affected by the selection strategies applied in the thinning treatments. Thus, selection in thinnings should focus on these traits as they affect both the quality and grades of logs (III). The applied thinning treatments did not significantly influence board properties, such as basic density, Modulus of Elasticity and Knot Area Ratio. However, differences in these variables between outer and inner boards indicate that quality improvement might be connected to improvement in the growth of individual trees (IV).

In summary, use of improved planting material and wider than currently applied 2x2 m spacing in combination with selection of high quality trees might lead to production of higher quality timber. However, the scope for selection decreases with time and since the Scots pine boards from thinned stands and unthinned stands did not significantly differ the target traits and both objectives and market conditions must be carefully considered.

Authors/Creators:Liziniewicz, Mateusz
Title:Influence of spacing and thinning on wood properties in conifer plantations
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :January 2014
Number of Pages:61
I.Egbäck, S., Liziniewicz, M., Högberg, K.-A., Ekö, P.-M., Nilsson, U. (2012). Influence of progeny and initial stand density on growth and quality traits of 21 year old half-sib Scots pine (Pinus sylvestris L.). Forest Ecology and Management, 286, pp. 1-7.
II.Liziniewicz, M., Ekö, P.-M., Agestam, E. (2012). Effect of spacing on 23- year-old lodgepole pine (Pinus contorta var. latifolia) in southern Sweden. Scandinavian Journal of Forest Research 27(4), pp. 361-371
III.Liziniewicz, M., Ekö, P.-M. (2013). Effects of five tree-selection strategies when thinning spruce (Picea abies L. Karst) stands: Results from a field trail in southern Sweden. (manuscript).
IV.Liziniewicz, M., Ekö, P.-M., Säll, H. (2014). The impact of thinning on the quality-determining properties of boards from 90 year-old Scots pine (Pinus sylvestris L.) stands in southern Sweden. (manuscript).
Place of Publication:Alnarp
Publisher:Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7930-7
ISBN for electronic version:978-91-576-7931-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Agrovoc terms:picea abies, pinus sylvestris, pinus contorta, wood, quality, selection, spacing, thinning, wood properties, growth, coniferous forests, sweden
Keywords:Scots pine, Norway spruce, lodgepole pine, external wood quality, selection, thinning methods, spacing, thinning from above, thinning from below, thinning form, wood properties, wood characteristics
Permanent URL:
ID Code:10914
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: Mateusz Liziniewicz
Deposited On:13 Jan 2014 13:26
Metadata Last Modified:10 Dec 2014 12:22

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