Predicting lumber grade and by-product yields for Scots pine trees

Henna T. Lyhykäinen, Harri Mäkinen, Annikki Mäkelä, Sami Pastila, Antti Heikkilä, Arto Usenius

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

The purpose of this study was to develop models for estimating yields of lumber grades and by-products of individual Scots pine (Pinus sylvestris L.) trees using stem and crown dimensions as explanatory variables. Two separate data sets were used: (1) one simulated by the process-based growth model, PipeQual, which provides information about stem form and branch properties. The model was used to predict the 3D structure of Scots pine stems from thinning regimes of varying intensity and rotation periods and (2) an empirical data set with detailed 3D measurements of stem structure. The stems were sawn using the WoodCim sawing simulator and the yields and grades of the individual sawn pieces, as well as by-products, were recorded. The sawn timber was classified on A, B, C and D-grades for side and centre boards separately (Nordic Timber grading). By-products were pulpwood, sawmill chips, sawdust and bark. The response variables were formulated as proportions of the total volume of each stem. Multinomial logistic regression models using pulp wood proportion as a reference category were developed based on both data sets separately, and each model was tested on the other data set not used in model building. We found that the proportions of A and B grade lumber and pulp wood were inaccurately predicted. By combining data sets we formulated more accurate models. In combined data set's models, the best combination of explanatory variables was diameter of the stem at the breast height, its logarithmic transformation, the height of the living crown (distance from ground to lowest living branch) and the height of the lowest dead branch (branch diameter ≥1.5 cm). The developed approach integrates implications of forest management for the quality of round wood and sawn wood conversion chain. The models can be used to optimize stand management with respect to the value of potential sawmill products.

Original languageEnglish
Pages (from-to)146-158
Number of pages13
JournalForest Ecology and Management
Volume258
Issue number2
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

Fingerprint

lumber grades
Pinus sylvestris
stem
branches
pulpwood
stems
sawmills
byproducts
tree crown
timber
stand management
stem form
sawing
by-product
sawdust
thinning (plants)
growth models
forest management
breasts
bark

Keywords

  • Pinus sylvestris
  • Wood quality
  • Timber products
  • Product recovery
  • Process based growth model
  • Sawing simulations

Cite this

Lyhykäinen, H. T., Mäkinen, H., Mäkelä, A., Pastila, S., Heikkilä, A., & Usenius, A. (2009). Predicting lumber grade and by-product yields for Scots pine trees. Forest Ecology and Management, 258(2), 146-158. https://doi.org/10.1016/j.foreco.2009.03.054
Lyhykäinen, Henna T. ; Mäkinen, Harri ; Mäkelä, Annikki ; Pastila, Sami ; Heikkilä, Antti ; Usenius, Arto. / Predicting lumber grade and by-product yields for Scots pine trees. In: Forest Ecology and Management. 2009 ; Vol. 258, No. 2. pp. 146-158.
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Lyhykäinen, HT, Mäkinen, H, Mäkelä, A, Pastila, S, Heikkilä, A & Usenius, A 2009, 'Predicting lumber grade and by-product yields for Scots pine trees', Forest Ecology and Management, vol. 258, no. 2, pp. 146-158. https://doi.org/10.1016/j.foreco.2009.03.054

Predicting lumber grade and by-product yields for Scots pine trees. / Lyhykäinen, Henna T.; Mäkinen, Harri; Mäkelä, Annikki; Pastila, Sami; Heikkilä, Antti; Usenius, Arto.

In: Forest Ecology and Management, Vol. 258, No. 2, 2009, p. 146-158.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Lyhykäinen, Henna T.

AU - Mäkinen, Harri

AU - Mäkelä, Annikki

AU - Pastila, Sami

AU - Heikkilä, Antti

AU - Usenius, Arto

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KW - Timber products

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Lyhykäinen HT, Mäkinen H, Mäkelä A, Pastila S, Heikkilä A, Usenius A. Predicting lumber grade and by-product yields for Scots pine trees. Forest Ecology and Management. 2009;258(2):146-158. https://doi.org/10.1016/j.foreco.2009.03.054