木材结晶度与树木年轮的生长特征、化学组成的相关性

采用X射线衍射法测定湿地松的木材结晶度,对木材结晶度与树木年轮的生长特征(年轮宽度、早材宽度、晚材宽度、晚材率和年轮距髓心距离等)、木材化学组成(α-纤维素和木质素)之间的相关性进行了研究。结果表明:1)木材结晶度与树木年轮的年轮宽度、早材宽度、晚材宽度、α-纤维素和木质素存在显著的相关关系;2)通过比较木材结晶度分别与树木年轮生长特征因子、化学组成因子建立的回归模型可知,回归模型同时选用树木年轮的生长特征、化学组成因子时的拟合性最好,模型校正决定系数最高,并在统计意义上显著。因此,可以利用树木年轮的生长特征、木材化学组成来评估木材结晶度,并可将木材结晶度作为一项综合评价树木生长特征和木材性质的重要指标。

Correlation of wood crystallinity with chemical composition and annual ring characteristics of slash pine trees

Crystallinity of slash pine (Pinus elliottii Englem.) wood was measured by X-ray diffraction (XRD) technique, and the correlation of wood crystallinity with annual ring characteristics (ring width, earlywood width, latewood width, latewood percentage and distance to the pith) and chemical composition (α-cellulose and lignin) was investigated. Wood crystallinity was significantly correlated with ring width, earlywood width, latewood width, and contents of α-cellulose and lignin. Compared with the regression model of wood crystallinity based on either annual ring characteristics or chemical composition, the data was bested fit by the regression model consisting of both annual ring characteristics and chemical composition according to the adjusted R2. These results suggest that wood crystallinity can be estimated by tree annual ring characteristics and chemical composition, and on the other hand wood crystallinity can also be an important index to evaluate the growth traits of trees and wood properties.