WITHIN-TREE VARIATION OF WOOD PROPERTIES AND REASONAL APPROACH TO SAMPLING WOOD IN PINUS MASSONIANA LAMS
ZLou Zhichun, Wang Zhangrong & Chen Tianhua (Nanjing Forestry University) Zheng Jiaju & Wang Yuanian (Xipi Forest Farm, Fujian Province)
Within-trcc variation of specific gravity, tracheid length and latewood percent of masson pine was studied in details. The study shows that large variations existed of wood properties from pith to bark and from tree base to the tip. It was basic radial variation of three wood characteristics to increase gradually with age from the pith, and to trend to level off or to decrease lightly after the maximum. Specific gravity and latewood percent decrease with height from tree base to the tip, and while tracheid length increases with height within some distance from tree base, and decreases slightly after the maximum. The longest tracheid length was found within the outerest at 1/3 stem height. Strong correlation existed between breast height value and average stem value for specific gravity. No significant difference among radial cardial directions within breast height was found for specific gravity and tracheid length. It was satisfactory to use nondestructive approach to evaluating average stem value of wood properties using any direction sample at breast height.