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通过显微观察及傅里叶红外光谱和X-射线衍射光谱分析,对杂交鹅掌楸弯曲树干和倾斜树干的应力木特征进行了研究。结果表明:在弯曲树干中,应拉区的胶质木纤维含量极少,导管数、导管平均直径及组织比量与对应区和过渡区有明显差异;应拉区木材红外光谱特征与对应区和过渡区相似;应拉区中吸收强度比值(I1 505/I1 739)大于对应区和过渡区,说明其木质素含量较高;应拉区和过渡区纤维素结晶度显著低于对应区。倾斜树干中表现出相反规律,应拉区富含胶质木纤维(26.1%),应拉区导管数、导管平均直径均小于过渡区木材;应拉区木材在波数1 739 cm-1和1 505 cm-1的吸收峰强度均低于对应区和过渡区木材;应拉区和过渡区纤维素结晶度明显高于对应区。据此认为杂交鹅掌楸应力木特征产生于倾斜生长的树干。
Through the microscopic observation and Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) spectroscopy, the stress wood characteristics of curved and tilted trunk of T. hybrida were studied. The results showed that the content of gummy wood fiber, the average number of catheters, the average diameter of catheters and the ratio of tissue in the crooked trunk were significantly different from the corresponding areas and the transitional areas. Which is similar to the transition zone. The ratio of absorption intensity in the zone of pull-out zone (I1 505 / I1 739) is larger than that in the corresponding zone and transition zone, indicating that the content of lignin is higher. The degree of crystallinity of cellulose in zone and transition zone is significantly lower than that in the corresponding zone. Tilted trunk showed the opposite law, should be pulled zone is rich in glial wood fiber (26.1%), the number of ducts should be pulled catheter, the average diameter of the catheter are less than the transition zone wood; should be pulled wood in the wave number 1 739 cm-1 and 1 The intensity of 505 cm-1 absorption peak was lower than that of the corresponding zone and the transition zone wood. The crystallinity of cellulose in the zone of strain and transition zone was obviously higher than that of the corresponding zone. According to the above, stress wood characteristics of Liriodendron hybrid came from the tilted trunk.