【摘要】 对 6年生桤木种源 /家系的多点试验林的材性进行了研究 ,结果表明木材基本密度和纤维长度的种源间差异极显著 ,家系间差异不显著 ;木材基本密度的种源×地点的交互作用并未达到显著水平 ,纤维长度的种源×地点的交互作用达到显著水平。3个地点木材基本密度的种源遗传力和家系遗传力分别为 0 .564 8～ 0 .6618、0 .2 857～ 0 .653 5;木材纤维长度种源遗传力和家系遗传力分别为 0 .2 553～ 0 .7895、0 .2 90 5～ 0 .4 52 8。木材密度、纤维长度和生长性状三者之间的相关关系均不显著 ,可以进行 3个性状的独立选择。提出桤木木材密度和纤维长度随年龄变化的生长模型和早晚期相关关系 ,适宜的早期选择年龄为 6a,从木材密度考虑培育造纸材的适宜年龄拟定为10～ 11a。江西点 15个种源的木材密度在种源间达到了显著差异 ,家系间并未达到显著差异 ,纤维长度在种源间、家系间都达到极显著差异更多还原

【Abstract】 The trial plantations with 15 Alnus cremastogyne provenances were planted in 6 sites along the middle and lower reaches of Yangtze River according to a split plot design.Four hundred and sixty two wood cores were sampled from 3 sites of 6 year old plantations for measuring and analyzing the wood density and fiber length of 15 A. cremastogyne provenances.The results showed that provenance means for wood density was 0 382 3 g·cm -3 and fiber length was 1 247 9 mm.It also proved that there existed significant differences among provenances in wood quality and fiber length.The interaction between provenance and site in wood density was not significant,however,that between provenance and site in fiber length was significant.Meanwhile,in Jiangxi Province,there also existed significant difference among provenances and families in fiber length,however,significant difference in wood density was only existed among provenances.Wood density and fiber length were not significantly correlated.The relationship between wood quality and growth characters was also weak,hence the selection of wood property or growth character can be conducted independently.Genetic parameter analysis showed that the provenance heritability and family heritability of wood density were 0 564 8～0 661 8 and 0 285 7～0 653 5,while that of fiber length were 0 255 3～0 789 5 and 0 290 5～0.452 8.The models of the changes of wood density and fiber length with the age and the correlation of early stage and late stage were set up.It is proved that the feasible age for genetic selection is 6 years old.From the viewpoint of wood density,the feasible age for culturing pulp wood is 10～11 years old.更多还原