微密度計法應用於評估杉木實生淋與萌櫱林木材年輪構造

Evaluation of Annual Ring Structure of Seedling and Sprouting China-fir with Microdensitometer Method

陳勁豪(Jin-Hau Chen) ； 林法勤(Far-Ching Lin) ； 王松永(Song-Yung Wang)

《林產工業》 21卷2期 (2002/06) Pp. 91-96

https://doi.org/10.6561/FPI.2002.21(2).2

摘要

經X-ray微密度計檢視後發現，實生林木材的平均秋材率和萌櫱林木材的無顯著性差異，同時兩者秋材率隨著年齡的增加，而以線性關係增加。萌櫱林木材的平均密度大於實生林木材的平均密度，但無顯著的差異，而兩者的密度越往樹皮的方向有呈線性增加的趨勢。實生林木材的平均年輪寬大於萌提林木材的平均年輪寬，同時年輪寬越遠離髓心越小，而且在最初10年內年輪寬度急劇下降，10-15年後則減少和緩，15年後有慢慢趨於一定的態勢。

關鍵字

杉木 ； 萌櫱林 ； 實生林 ； X-ray微密度計 ； 秋材率

並列摘要

By X-ray micro-densitometry test, there is no significant difference in average percentage of latewood between seedling and sprouting China-fir. The average percentage of latewood of them increase linearly with increasing age. There is no significant difference in average gravity between seedling and sprouting China-fir. The average gravity of them increase linearly towards bark. The average ring width of seedling China-fir is greater than that of sprouting China-fir. And the average ring width decreases from pith to bark. During the first ten years, ring width decreases rapidly. While the width of 10th-15th growth ring decreases smoothly, after the 15th annual ring, the width of annual ring becomes stable.

並列關鍵字

China-fir ； Sprouting growth ； Seedling growth ； X-ray Microdensitometer ； Percentage of latewood