不同树龄西南桦材性差异研究

对不同树龄西南桦木材物理和主要力学性质的测定研究表明:西南桦木材密度、干缩性和主要力学性质随着树龄的增大而增大;经差异显著性t检验,7年生与11,15,19年生均差异显著,而11,15,19年生三者之间有的指标差异显著,有的指标差异不显著,因此,在利用西南桦木材时应对树龄加以特别考虑.

Study on Difference in Wood Properties from Varied Aged Plants of Betula alnoides

The physical and mechanical properties of timber sampled from different aged trees of Betula alnoides were determined.The results showed that the density,shrinkage and major mechanical properties of the timber increased along with increment of the sampled tree ages.According to 't' test results that there were significant differences in the above properties of the wood between samples from 7 and 11 year old,and between 15 and 19 year old trees of Betula alnoides.There were significant differences in some of the indices determined among 11,15 and 19 year old timber samples,whereas there were no significant differences in some other indices among the 3 groups of different aged trees.So,the effect of tree ages on wood properties must be considered carefully when Bethla alnoides wood is to be utilized.