毛竹材气干密度的变异研究

利用称重法对毛竹气干密度变异规律进行了系统的研究,结果表明:由竹青到竹黄,密度呈逐渐减小的趋势;从竹青至竹黄的1/3处,密度值减幅逐渐减小;但至竹黄处,密度值有增加的趋势。随着竹龄的增大,竹材密度也相应增大,6年生的竹材密度达到最大。竹秆从下到上,密度逐渐增加。通过对毛竹密度的各个影响因素进行方差分析和多重比较分析,得出部位、年龄、高度3个因素对毛竹密度的影响均显著。

Research on Variation of Air-dry Density of Bamboo

Bamboo, an important biological resource, has gradually become an alternative to wood for its fast growth, high productivity and good quality, but the variations in mechanical properties lead to the difficulty in using to some extent. So deep understanding of the properties in bamboo is needed to improve the utilization. As we know, bamboo density is the basis for the research of mechanical properties. In view of this, this paper studied the variations in bamboo air-dry density by weighing method. The results showed： the density decreased gradually from the outer to inner of bamboo, but from the interval of 1/3 of the wall from the outer to inner of bamboo, the density decreased greatly. Then, the change trend was much stable, but the density showed an increase trend at the inner lay. With the age increase, the air-dry density of bamboo also showed an increase trend, gradually from bottom to top of bamboo culm. Through variance analysis and multiple comparisons of the various influencing factors, we concluded that site, age and height affect air-dry density significantly.