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本文分析了已见报的１５种国产云杉属植物的核型变异、进化水平及其在系统分类、起源、演化方向等细胞分类学及细胞地理学意义。还讨论了核型资料对种质资源保存、良种选育及更新树种选择等的林学意义。首次提出双向不对称系数（Ｂａ．ｋ％）来评定属内种间的核型变异程度及进化水平
This paper analyzes the karyotype variations and evolutionary levels of 15 species of domestic Picea species that have been reported and their significance in taxonomy, origin and evolutionary direction. It also discussed the significance of karyotype data on conservation of germplasm resources, selection of elite species and selection of updated species. The bidirectional asymmetry coefficient (Ba.k%) was first proposed to assess the degree of karyotypic variation and evolutionary level