Variation of Wood Tracheid Character and Crystallinity of Calocedrus macrolepis
Calocedrusmacrol.epis is a rare tree species occurring in Yunnan, China. In order to understand the timber properties of the tree, a comprehensive determination and analysis were conducted on the morphological features, such as radical variation of wood tracheid length, width and crystallinity in each growth ring of C. macrolepis in different tree heights and directions, and on the correlation between these factors. The results were reported as follows. 1) The tracheid length and width increased with the increase of growth ring which was stabile after 20 years of growth. So the maturation stage of C. macrolepis was 20 a. The variance analysis indicated that the tracheid length and width in different directions was not significantly different, however, significant differences were found in different tree heights, and also decreased with the tree height. 2) The radical variation tendency of crystallinity was similar to the tracheid morphological features, and significantly correlated with the tree age. The crystallinity decreased with the increase of tree height, and in different directions, it was in the order of south＞ east ＞ north ＞ west. 3) Correlated analysis of crystallinity and tracheid morphological features indicated that the crystallinity was positively and significantly correlated with tracheid length and width with the correlation coefficient up to 0. 9. Based on these, the prediction model of the cryatallinity and wood tracheid parameters was established. To sum up, C. macrolepis, exhibited high potential as a commercial tree species with excellent tim-ber quality. The conclusion would provide theoretic guidance to the use of C. macrolepis and theoretic basis to the tracheid morphological feature prediction by crystallinity.
国家科技期刊平台
NSTL
万方数据
维普
