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对50年生降香黄檀(Dalbergia odorifera)木材的生材性质进行研究,并与25年生降香黄檀进行比较分析。采用体积法和质量法测定树皮率,排水法测定木材体积,并对测定得到的数据进行分析。研究结果表明:50年生降香黄檀树皮体积百分率和树皮质量百分率随着树高的增加而增加,平均值分别为19.81%、19.86%。心材率随着树高的增加而减小,但没有明显的变化规律,心材在根部较大,树干根部心材率最大为30.83%,平均值为7.79%。生材密度从髓心向外,南向和北向都先减小后增大,且随着树高增加而减小,平均值为0.973g/cm3。基本密度从髓心向外,南向和北向均逐渐增加,随着树高增加,呈先减小后增大再减小的趋势,平均值为0.655g/cm3。50年生降香黄檀生材含水率从髓心向外,南向跟北向均减少,随着树高的增加而减小,平均值为48.98%。50年生与25年生降香黄檀相比,心材率均随着树高的增加而减小。两者根部心材率相差不大,但25年生降香黄檀心材率平均值为30.53%,而50年生降香黄檀心材率平均值仅为7.79%,具体原因尚不可知,需进一步探究。
The biomasses of 50-year-old Dalbergia odorifera wood were studied and compared with the 25-year-old Dalbergia. The bark rate was determined by volumetric method and mass method. The volume of wood was measured by drainage method. The data obtained from the determination were analyzed. The results showed that the percentage of birch bark and the percentage of bark quality of 50-year-old rose increased with the increase of tree height, with the average values of 19.81% and 19.86%, respectively. The heartwood rate decreased with the increase of tree height, but there was no obvious change rule. The heartwood was larger at the root, and the maximum heartwood rate was 30.83% at the root of trunk, with an average value of 7.79%. The density of raw material goes outwards from the medullary center, decreases first and then increases in the south and the north, and decreases with the increase of the tree height, the average value is 0.973g / cm3. The basic density from the medullary heart outward, south and north are gradually increased, with the tree height increases, the first decreased and then increased and then decreased, with an average of 0.655g / Rate from the medulla outwards, south and north are reduced, with the tree height increases and decreases, with an average value of 48.98%. Compared with the 25-year-old Dalbergia perennial, the 50-year-old heart rate decreased with the increase of tree height. However, the average rate of heartwood of 25-year-old rosewood was 30.53%, while the average value of 50-year-old rosewood heartwood was only 7.79%. The specific reason is unknown and needs further exploration.