南带产区杉木正常木与被压木的比较解剖研究

Wood Anatomy Contrast of Chinese Fir(Cunninghamia lanceolata)for Normal Tree and Suppressed Tree in Southern Growing District

为了解杉木正常木与被压木木材解剖上的差异,采用宏观、微观的方法,以广西国营高峰林场12～13年生的杉木木材为试验材料,于2001～2003年研究了南带产区杉木正常木与被压木木材解剖特征.结果表明,正常木与被压木的生长轮宽度径向变异规律相似,均为随着树龄的增加呈先增加后减小的趋势,纵向变异规律相似,均随着树高的增加呈先增加后减小的趋势.正常木的年轮宽度大于被压木.正常木与被压木的晚材率径向变异规律相似,均随着树龄的增加而基本保持不变,纵向变异规律相似,均为随着树高的增加而基本保持不变.正常木与被压木管胞长度、长宽比的径向变异规律相似,均是随着树龄的增加而增加.正常木与被压木管胞长度、管胞宽度、管胞长宽比纵向变异规律相似,均随着树高的增加而呈先增加后减小的趋势.从研究结果来看,正常木与被压木木材解剖特征变异规律相似.

In order to find out the differences between normal tree and suppressed tree of Chinese fir (Cunninghamia lanceolata, wood anatomy characteristics of normal tree and suppressed tree were studied from 2001 to 2003, based on 12~13 years old trees in Gaofeng Forestry Center of Guangxi province. The results showed that: Radial and longitudinal variation rules of growth ring in both normal tree and suppressed tree were similar. It increased at first, then decreased with the increase of ages or height. Radial and longitudinal variations of latewood percentage were almost constant in both normal tree and suppressed tree. The suppressed tree's growth ring width was less than normal tree's. The tracheid length, tracheid width and ratio of length to width all increased with increasing ages in both normal tree and suppressed tree, While they increase firstly, and then decreased with height of the trees. This suggested that variation rules of wood anatomy characteristics in normal tree and suppressed tree were similar, but the normal tree's growth ring width was more than suppressed tree's.