The seedling height and the increment of diameter at base ( DAB ) of one year old container seedlings of Dracontomelon duperreanum were used to be level standard in different level of management carried out in Nanning.We used a cluster analysis to study that level with standard of 3 levels; level I , DAB≥l.35cm and H≥52.0cm; level Ⅱ : DAB5≥1.18cm and H≥44.0cm; level Ⅲ : D ＜ 1.18cm and H ＜44.0cm.These standards were recom-manded in plantation practice.%以南宁市3个不同育苗管理水平所培育的1年生人面子容器苗为对象,以苗高和地径生长量作为其苗木质量的分级指标,采用聚类分析方法,对1年生人面子容器苗的苗木质量分级进行了研究,结合其苗木的生产实际,制定了1年生人面子容器苗苗木的3级分级标准:Ⅰ级苗,D≥1.35 cm,H≥52.0 cm;Ⅱ级苗,D≥1.18cm,H≥44.0 cm;Ⅲ级苗,D＜1.18 cm,H＜44.0 cm.此标准可供苗木生产部门参考.
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