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

1 2018

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Changes in volume and share of quality grades in large-sized timber depending on cut to length long timber variants

Szaban J., Płóciennik M., Płońska-Kaczor K., Kowalkowski W., Karaszewski Z.

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

2018

No. 104

85--90

The aim of this study is to determine changes in volume and share of quality grades in pine timber depending on the adopted cut to length variant. For the purpose of this study one plot was selected, on which final cutting was performed. The plot was located in the Lipka Forest District, the Białobłocie Forest Division, in compartment 98a. The experimental site was covered by a pine stand aged 110 years. It was decided for this analysis to select trees meeting the dimension and quality requirements for grades A, B and C. The whole stem was measured and the long timber was cut into logs of 4 m, 5 m and 6 m in length. Next using calipers the smallest diameter under bark was determined for each log. These measurements made it possible to establish the volume and quality and dimension grades of the whole stem as well as those of logs, into which it was cut to length. Analyses showed that the volume of that timber assortment changes at cut to length logging of pine long timber. In the case of 4m logs the volume increases, while for 5m and 6m logs it decreases. It was also observed that after cutting to length of logs from long timber the share of higher grades decreases considerably to the advantage of lower grades.