两年生铁冬青容器苗苗木质量分级研究

Study on Quality Grading for Two Years Old Container Seedlings of Ilex Rotunda Thunb

为评价铁冬青2年生容器苗的苗木生产质量,选择苗高和地径作为苗木分级质量指标,采用逐步聚类分析方法,将铁冬青两年生容器苗分为3级,即:Ⅰ级苗:D≥1.90 cm,H≥1.74 m;Ⅱ级苗:1.90 cm﹥D≥1.73cm,1.74 m﹥H≥1.50 cm;Ⅲ级苗:D<1.73 cm,H<1.50 m.此标准可供苗木生产部门参考.

In order to evaluating Seedling Quality of two years container seedling for Ilex rotunda,the seeds were collected at the right moment,stored in sand at low temperature,and at the seedling growth stage,watering,fertilizationg and pest control were paid great attention. The seedling height（ H） and the basal diameter（ D） of two years old seedlings of Ilex rotunda were used to be level standard. We used the cluster analysis to study that level with standard of 3 levels. levelⅠ： D ≥1. 90 cm,H≥1. 74 m; Ⅱ： 1. 90 cm﹥ D≥ 1. 73 cm,1. 74 m ﹥ H≥1. 50 cm; Ⅲ： D〈 1. 73 cm,H 〈1. 50 m. The standars were recomanded in plantation practice.