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국내연구정보 (Domestic information)
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  Annual Ring Width and Summer Wood Percentage
  글쓴이 : 관리자     날짜 : 08-12-22 20:46     조회 : 8097    
Studies on Wood Quality of Pinus koraiensis Sieb. et Zucc. (Ⅲ) -On Annual Ring Width and Summer Wood Percentage- <Jour. Kor. For. Soc. 24:25-44 1974> Won-Yong Lee

Observations were made on the visual characteristics such as the annual ring width and summerwood percentage of Pinus koraiensis Sieb. et Zucc. grown at the School Forest, Kangwon National University. The results of the study were as follows:
<Characteristics of annual ring width and summerwood percentage>
1) The range of dispersion of annual ring width and summerwood percentage were 0.5-6.5mm and 5-50% on the normal wood; and its arithmetic mean values were 3.0mm and 24% on all sample trees. 2) The values of annual ring width of heart wood were larger than that of sapwood but on the contrary the values of summerwood percentage of heartwood were smaller than that of sapwood. On the other hand variations of these values were distinguished on the heartwood. 3) The values of annual ring width due to the parts of stem with crown, with clear length and at bottom showed that the largest values were given at the parts of stem with crown. But on the contrary the summerwood percentage values were largest at the parts of stem at bottom on all sample trees. 4) The values of annual ring width and summerwood percentage depending on the stand direction were not obvious.
<Horizontal and vertical variations of annual ring width and summerwood percentage>
1) It was recognized that horizontal (radial direction) variations of annual ring width and summerwood percentage indicated two different patterns (the region of large fluctuation and that of small fluctuation) in a tree stem. These boundaries seemed to appear at the parts of 12-15 annual rings from pith. 2) According to the increase of height in tree the values of annual ring width increased but the values of summerwood percentage gradually decreased. 3) But vertical variations of annual ring width and summerwood percentage on the sapwood were divided into two different parts (region of increased or decreased upwards and that of remained constant in successive height) in a tree stem and these limits seemed to appear at the 7 m of height in trees.
<Relations between annual ring width and summerwood percentage>
1) The modes of summerwood percentage related with annual ring width seemed to appear almost in the definite range (10-25%). 2) The relations between annual ring width and summerwood percentage showed a highly negatine correlation on all sample trees.

   

 
   

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