Radial and axial variation in specific gravity and anatomical properties of plantation grown Eucalyptus citriodora Hook

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 μm to 1301 μm and 1211 μm to 1166 μm in radial and axial directions respectively. Similarly vessel diameter showed a range of 112 μm to 151 μm radially and 118 μm to 141 μm axially; vessel element length ranged from 405 μm to 505 μm in radial direction and 428 μm to 461 μm 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.