Radial and axial variation in specific gravity and anatomical properties of plantation grownEucalyptuscitriodoraHook

Abstract

Radial and axial variation in specific gravity and certain anatomical properties were investigated in twenty year old plantation grown Eucalyptus citriodora Hook. Specific gravity and certain anatomical properties varied significantly in both directions. Average specific gravity ranged from 0.666 to 0.711 pith outwards and 0.762 to 0.728 base upwards; average fibre length ranged from 1062 mm to 1301 mm and 1211 mm to 1166 mm in radial and axial directions respectively. Similarly vessel diameter showed a range of 112 mm to 151 mm radially and 118 mm to 141 mm axially; vessel element length ranged from 405 mm to 505 mm in radial direction and 428 mm to 461 mm in axial direction. Although the fibre diameter, fibre lumen diameter and wall thickness showed significant variation, the differences in their values were found to be minor. Maximization of parameters was taking place after 75% of radial distance for specific gravity and fibre length. Based on general features, physical properties and anatomical structure, the wood can be used in furniture and handicraft industries.

Effect of soil type on mean annual increment, wood anatomy and properties of 33-year-old Corymbia citriodora (Hook.), K. D. Hill, & L. A. S. Johnson

“…Heartwood percentage in 20-year-old C. citriodora trees in India ranged from 74% to 84% at the trunk base (0.6 m) and 68% to 79% at the trunk top (6.6 m). In our study with 33-year-old trees, results showed that heartwood percentage in LV (70%) and LV (71%) soils is close to values found by the authors, regardless of height (Shashikala & Rao, 2009). We found a gradual increase in pith to bark direction for fiber length in three soil types.…”

A preliminary investigation into the suitability of Kawui wood (Vernonia arborea) for pulp and paper

“…In contrast, Quilhó et al (2006) found the fibre length of Eucalyptus grandis has an increasing trend from heartwood to sapwood. Shashikala and Vijendra (2009) revealed the significant differences of the cell dimension of Eucalyptus citriodora (Hook) from pith outward (heartwood to sapwood). The mean of fibre length and fibre diameter of Kawui wood can be classified as ‘medium.’ However, there is a significant difference between the ‘thick’ lumen diameter of Kawui wood and that of ‘medium’ lumen diameter of E. pellita (Lukmandaru 2016).…”