Dry Shrinkage Properties of Different Eucalypt Clones and Stem Heights
Wood dry shrinkage properties of the timber of different eucalypt clones and stem heights were investigated to examine the impacts of air and oven drying methods on 14 indices such as tangential and radial directions, volume, etc. Remarkably significant differences in all shrinkage indices among 11 clones were observed in air-dry state at the level of p≤0.001, and highly significant differences were found in both air and oven dry state at the level of p≤0.001. For the shrinkage properties of the timbers with different tree heights, except that tangential shrinkages of the timber in oven-dry state were highly and significantly different (p≤0.01), other indices either in oven dry or in air dry were not significantly different. The total average of phenotypic shrinkage variation coefficient was relatively small, with the value of 3. 7%, ranging from 2. 55%~5. 4%. But the phenotypic shrinkage variation coefficient of the timbers from 3 different stem heights was relatively large, among them, the middle stem which was 2. 6 m~5. 2 m high had relatively smaller variation coefficient. The wood shrinkage variation coefficient in air-dry state was twice than that in oven-dry state. Three groups were divided among 11 clones according to the cluster analysis, each group possessed special shrinkage properties.
国家科技期刊平台
NSTL
万方数据
维普
