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The short rotation plantation wood is emerging as a major raw material resource due to ban on felling of trees in the forests. Eucalyptus species being fast grown is one of the most extensively cultivated species in India under major afforestation programmes. The wood obtained from short rotation plantation is different. Its utilization is therefore beset with number of problems. The various end-uses of Eucalyptus species prompted studies in its strength properties and variability in relation to location, age, height and girth. It is important to study the quality of wood by studying the physical (specific gravity and shrinkage behavior) and also the structural changes which in turn influence the properties. These studies will have practical utility in plantation forestry for determining the end uses apart from poles which are being used.

The importance of the present project lies in the facts that microfibril angle and spiral grain drastically influence physical and strength properties of timber. These studies carried out with respect to different age groups of CPTs in radial direction. Attempts are made to find out the relations between the strength properties (sp.gr.) with that of microfibril angle, spiral grain angle and their inter-relationships. This helps in predicting the behavior of timber in different usage and processing and thus provide better understanding of the nature of the material as well as its rational and appropriate utilization.

Radial variation of specific gravity was carried out on 5 CPTs each of Eucalyptus tereticornis and E.camaldulensis were taken for the determination of specific gravity, spiral grain angle, shrinkage properties and microfibril angle. The specific gravity within CPTs is found higher towards the pith side and decreases towards periphery. For the measurement of microfibril angle using Image Analysis System, the pit aperture orientation methodology was found better technique in the hardwoods like Eucalyptus. The microfibril angle was found to vary between 20 to 30 ° in the radial direction having maximum value towards pith side. Some of the CPTs having higher microfibril angle show higher shrinkage particularly in longitudinal direction. For the measurement of spiral angle, an instrument called Scribe Tester was got fabricated. This was used for measuring the spiral angle on the planks of these species and found to vary below 5 ° in both CPTs. The results showed that CPTs like APKKG4, APKMDM6, APKZSI and APNEKA2 have better quality i.e.less of spiralioty and microfibril angle than others. When vegetative methods are followed, they are expected to produce the same characters.

 

 
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  Last Updated on 03-08-2015