Influence of spacing and thinning on wood properties in conifer plantations.
Mateusz Liziniewicz (Doctoral thesis).
Regeneration in wide initial spacing, thinning mechanization and planting of foreign tree species has been used in Sweden since 1960's to keep profitability and competitiveness of the Swedish forestry sector. In the same time, the decrease in timber quality has been considered as a possibly negative consequence of mentioned silvicultural measures. In the last two decades industrial demand for high quality timber has decreased due to strong competition in the timber market. However, the situation might change in the future.
The results indicate that planted coniferous stands in southern Sweden contain a share of high quality trees which might be promoted by thinnings. Lodgepole pine (Pinus contorta L.) planted in southern Sweden has similar external quality traits as a native Scots pine (Pinus sylvestris L.), however, its growth superiority was not confirmed. If a careful selection aimed at a specific quality parameter is applied than the overall quality of the stand will increase in comparison with currently used thinning methods. Analysis of Scots pine boards’ quality from thinned and unthinned stands did not show differences thus, the selection traits and both objectives and market conditions must be carefully considered in forest plans.