THE ASSOCIATION BETWEEN CELLULOSE CRYSTALLITE WIDTH AND TENSION WOOD OCCURRENCE IN EUCALYPTUS GLOBULUS

Tension wood is a common reaction wood in hardwood species like Eucalyptus globulus, often causing significant processing issues in timber production. Detecting this wood type effectively is crucial for quality control in forestry. The authors investigated whether changes in cellulose micro-structure—specifically crystallite width—could serve as a reliable diagnostic indicator using modern diffraction technology.

Using SilviScan-2, an instrument designed for the high-speed analysis of wood micro-structure, the researchers analyzed 66 samples extracted from a single tree characterized by high levels of tension wood. By applying X-ray diffraction, the team measured the cellulose crystallite width in both tension wood and normal wood samples to establish if a measurable difference existed that could be used for identification.

The analysis revealed that tension wood contains significantly wider cellulose crystallites (mean of 3.6 nm) compared to normal wood (mean of 3.2 nm). These results were cross-validated against previous research, accounting for experimental broadening effects inherent in the measurement process. The study concludes that the SilviScan-2 system is a viable, efficient tool for identifying tension wood in increment cores, potentially improving the way plantation hardwoods are assessed for timber quality.

This research bridges the gap between fundamental wood science and practical industrial application. By establishing a quantifiable micro-structural marker for tension wood, this study provides a objective metric for foresters and timber processors to categorize wood quality without relying solely on subjective visual inspection.