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Effects of Thinning on the Timber Quality of Pinus koraiensis Grown in Korea  

Chong, Song-Ho (Korea Forestry Research Institute)
Jung, Doo-Jin (Korea Forestry Research Institute)
Park, Byung-Su (Korea Forestry Research Institute)
Chun, Su Kyung (College of Forest Science, Kangwon National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.31, no.2, 2003 , pp. 16-23 More about this Journal
Abstract
The study was performed to obtain basic data for high quality timber production and efficient utilization of woods by investigating the effects of thinning on timber quality of domestic Korean pine(Pinus koraiensis Sieb. et Zucc.) planted. The results of this study were summarized as follows ; Comparing the appearance of knot per one meter on log surface, the heavy thinned trees contained less knots than non-thinned ones. And the ratio of dead knots was decreased in heavy thinned trees compared with the non-thinned ones, but the knot size was increased. The inclination angle of dead knot is larger than that of live knot. The crooked logs in heavy thinning plot appeared less than those in non-thinning plot. In heavy thinning plot, the log circle percentage of cross section and the ratio of clear lumber were increased, compared with in non-thinning one. The grade of log was the highest in heavy thinning plot.
Keywords
thinning; Pinus koraiensis Sieb. et. Zucc.; knot; crooked log; clear lumber; grade;
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