红松木倾斜角度对其木材形成组织的影响

为研究树干倾斜角度对应压木木材细胞壁形成过程的影响,以7年生红松苗木为研究对象,对其茎干进行不同角度的倾斜处理.先后测定苗木的树高和胸径、木材形成组织中的木质素和纤维素含量、傅里叶红外变化光谱和极性代谢产物.结果表明:倾斜角度对高生长的抑制作用非常显著,对直径生长无显著影响.倾斜后木质素含量增加,纤维素含量降低;倾斜角度对木质素和纤维素含量均有显著影响.不同倾斜角度FTIR吸收峰强度也有明显差异.糖类、脂类、氨基酸、含氮化合物、有机酸等代谢物随倾斜角度呈现不同的变化规律.因此,红松苗木50°倾斜处理形成典型的应压木结构.代谢物相对含量的变化规律与形成的木材宏观性质相吻合.代谢物的变化也反映了树木对应力刺激的响应机制.

Effect of Stem Bending Angle on Formative Tissue During Wood Formation of Pinus koraiensis

In order to study the effect of stem inclination angle on compression cell wall formation, seven-year-old Pinus koraiensis was chosen for different mechanical bend angle treatments. The height and diameter at breast height, lignin and cellulose content, FTIR and polar metabolites were measured. The results showed that high growth rate was obviously restrained by inclination angle but diameter growth showed no marked effect. The lignin content increased and the cellulose content decreased in bended samples, and all showed significantly effected by inclination angle. FTIR also showed distinctly difference among different angles. The metabolites like carbohydrate, lipids, amino acids, N-compounds and organic acids showed different varying patterns. Therefore, the typical compression wood was formed when the stem was bended by 50° in P. koraiensis. The variation pattern of metabolites was in accord with macroscopic properties in newly formed wood. The changes of metabolites reflected the response mechanism in stress of tree.