对雷州5年生尾叶桉实生人工林研究的结果,表明尾叶桉木材基本密度变异大,变幅为0.3709～0.6476g/cm~3,且主要是受遗传控制。木材密度与高、径和材积生长呈极显著正相关,通过选择可得到生长快、密度高的优良材料。不同叶型和皮型个体的木材密度和木材量具有显著或极显著差异,表现出很强的规律性。披针形叶、粗皮或全脱皮是密度高、木材量大的个体形态特征,可作为早期选择的依据。 The results of 5-year-old Eucalyptus urophylla plantations in Leizhou showed that the variation of basic density of Eucalyptus urophylla was large, ranging from 0.3709 to 0.6476 g / cm ~ 3, and was mainly controlled by the genetics. Wood density and height, diameter and volume growth were extremely significant positive correlation, through the choice of growth can be fast, high density of fine materials. Wood density and wood volume of different leaf type and skin type individuals have significant or extremely significant differences and show strong regularity. Larch needle, bark or full peeling is a high density, large amount of wood morphological characteristics of individuals, can be used as an early basis for selection.