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| Intraannual and Vertical Variations in Rays of Pinus koraiensis and Larix kaempferi Woods Grown in Korea |
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| 글쓴이 : 관리자
날짜 : 09-11-04 14:23
조회 : 14723
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잣나무와 낙엽송재 방사조직의 연륜 내 및 축방향 변이성
Intraannual and Vertical Variations in Rays of Pinus koraiensis and Larix kaempferi Woods Grown in
Korea <Mokchae Konghak 37(1):65-72, 2009> Corresponding author kimnh@kangwon.ac.kr
Variation of wood rays within a growth ring and axial direction in Pinus koraiensis and Larix
kaempferi, which are important Korean commercial softwoods, was examined to get some useful
information for their effective utilization. Ray height in cell number and ray number per 0.25mm2
in tangential section were investigated by optical microscopy. The average heights of uniseriate
rays in Pinus koraiensis and Larix kaempferi were 6.3 and 9.1 cells, respectively. The average
numbers of uniseriate rays per 0.25mm2 in Pinus koraiensis and Larix kaempferi were 6.5 and 7.5,
respectively. The average heights of fusiform rays were about 20 cells but were not significantly
different in both species. From earlywood to latewood within a growth ring, the heights of
uniseriate and fusiform rays decreased but their numbers remained almost constant. Along axial
direction, the heights of uniseriate rays per 0.25mm2 in Pinus koraiensis were nearly constant from 0.2 m to 5.2 m but increased up to 19.2 m beyond 5.2 m. However, a constant pattern in the
numbers of uniseriate rays was not observed in Larix kaempferi. The heights of fusiform rays in
both species were the highest in middle part of stems but were the lowest in base and top of
trees. In conclusion, the ray variation pattern was comparatively clear within a growth ring but not
clear along axial direction.
Keywords: ray height, ray number, uniseriate ray, variation of rays, Korean white pine, Larix
kaempferi
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