长江滩地沙埋杨树木材解剖性质及其变异的研究

Study on the Anatomical Properties and Variation of Sand Covered Poplar Grown in the Beaches of Yangtze River

对滩地杨树经长时间沙埋这一特定情况下的木材解剖性质进行了系统研究,结果表明:滩地杨树经泥沙长时 间的掩埋后(以下称沙埋杨树),其纤维长度为短级(829．08μm),纤维壁厚为薄至厚,纤维、导管比量分别为 62．48％和24．09％,纤维长宽比为47．5,微纤丝角为15．3°。与同一品系正常立地条件下生长的杨树比较,其纤维 长度、纤维壁厚、导管组织比量等受到较大影响,相对差异值分别为-33．78％,34．70％、-33．08％,而射线比量、纤 维长宽比等影响相对较小;沙埋杨树微纤丝角较小、木纤维组织比量较大、纤维壁较厚,可预测其较正常立地条件下 的杨树具有较高的力学强度。各指标的径向变异,与正常杨树存在一定的差异,主要由各分子的生理功能及立地条 件使其生长期缩短两方面的原因造成。

The poplar grown on the beaches of Yangtze River , Anqing city, Anhui province , were selected to study the wood anatomical properties under sand covered. The results showed that the fiber length, fiber and vessel percentage, the ratio of fiber length to width and angle of microfibril with the values of 829.08 μm, 62.48%, 24.09% ,47.5, 15.3°. nificant effect by sand covered with the relative difference values of -33.78% ,34.70%, -33.08% ,while the properties of the wood ray percentage and the ratio of fiber length to fiber width had few effect. Compared to normal poplar tree, the sand covered poplar tree may be have larger wood mechanical prosperities according to the small angle of microfibril, the large fiber percentage and thick cell wall. The difference of wood properties＇ radial variation between normal and sand coyered resulted in different molecular physiological function and different growth cycle.