Growth Ring Width and Anatomical Properties of Toona sinensis Wood

Growth ring, vessel and fiber morphology of Toona sinensis wood were evaluated by using xylotomy and optical microscopy. The results were as follows: the growth ring width increased from pith to 10-year old, keeping vigorous growth from 1 to 20 years. The width, double wall thickness and lumen diameter of vessel in early wood and late wood increased from pith to 19-year old, then tending towards stability. The width of vessel in early wood and late wood were 12180 μm and 3875 μm, and the double wall thickness of vessel in early wood and late wood were 16.49 μm and 10.98 μm, respectively. The fiber length first increased from pith to 18-year, ending up with stability. The average fiber length, width, length to width ratio (L/W), double wall thickness, lumen diameter and double wall thickness to lumen diameter ratio (2T/D) were108094μm, 26.76 μm, 40.25, 7.96 μm, 18.80 μm, 0.43, respectively.