The Implications of Cellulose Crystallite Width for Solid Wood Processing and its Manipulation by Thinning and Fertilizer Application
SilviScan technology and a non-destructive core- sampling protocol designed to detect tension wood in Eucalyptus globulus, were applied to an E. globulus silvicultural trial. These procedures were to test the interaction of thinning and fertilizer application, to assess the effect that thinning had on tension wood formation. In addition, 35 trees were harvested to assess the implications of cellulose crystallite width (an indicator of tension wood severity) in the core-samples on solid wood processing performance. The results indicated that heavy thinning of trees at eight years of age contributed to the development of severe tension wood and that this effect was mitigated where fertilizer was applied. These findings support the commonly held belief that tension wood in straight vertical trees is formed as a response to bending stresses that develop from wind in stands destabilised by thinning. However, tension wood severity only increased in treatments where there had been a poor growth response. This is probably because in fertilized stands where there has been a significant growth response, increased stem bulk overcame internal bending stresses. There was an increase in board distortion during sawing and development of defects during drying as cellulose crystallite width increased in associated core samples. The results indicate that the core sampling strategy was effective in identifying trees with significant volumes of tension wood and could be used in tree improvement programs to select trees with improved processing performance. Processing performance deteriorated where the maximum crystallite width in the cores exceeded 3.4-3.5nm. This level was about the mean crystallite width in the most heavily thinned, unfertilized treatments.
Russell Washusen
Ensis-Wood Quality ensis-the joint forces of CSIRO and Forest Research, Private Bag 10, Clayton South, Victoria 3168, Australia
国际会议
The International Conference on Plantation Eucalyptus(桉树国际会议)
广东湛江
英文
20-29
2005-12-01（万方平台首次上网日期，不代表论文的发表时间）