邓恩桉根系生物量和根长的典型相关分析

用典型相关分析方法分析了不同林龄邓恩桉地上各主要器官的生物量和胸径树高（DBH）与不同土壤层根系生物量和根长的关系。结果表明，地上各指标与地下根系生物量和根长在土壤各层的分布相关。DBH、树干、树枝和树叶的生物量与根系生物量典型相关系数为4个，第4层根系生物量的权重最大，是整个根系生物量变化的主要因子。DBH、树干、树枝和树叶的生物量与根长的典型相关个数为3个，第3层根长是根系总长度变化的主要因子。

Canonical correlation analysis of roots biomass and length of Eucalyptus dunnii

Canonical correlation analysis was used to explore the relationship of biomass in aboveground organs, tree height and diameter at breast height to roots biomass and length at different soil layers in Eucalyptus dunni plantations at different ages. The resuits showed that the aboveground indices are correlated to the distribution of underground roots biomass and length at different soil layers. There were 4 canonical correlative coefficients between the diameter at breast height, biomass of trunk, branches and leaves and the roots biomass. The weight of roots biomass at the fourth soil layer was the greatest and was the major factor for biomass change in all roots. There were 3 canonical correlative coefficients between the diameter at breast height, biomass in trunk, branches and leaves and the roots length. The roots length at the third soil layer was the major factor for the change in total roots length.