浙江楠 1 年生容器苗质量分级研究

study on the Quality classification criteria of phoebe chekiangensis Annual container seedling

摘要:

本研究以浙江楠容器苗为试验材料,采用地径和苗高作为分级指标,应用平均值 ±标准差法和逐步聚类法开展 了 1 a生实生苗的苗木质量分级研究,发现标准差法计算的 I 级苗下限值偏高,逐步聚类法计算的"级苗下限值偏高;综合 确定浙江楠 1 a生容器苗质量分级标准: I 级苗地径 0. 24cm 以上,苗高 13. 0 cm 以上 ; "级苗地径在 0. 15~0. 24cm 之 间,苗高在 8. 0~13. 0 cm之间 ; I 、"级苗为合格苗,确定的合格苗木接近85%的控制率。

Abstract:

In this study, the container seedlings of phoebe chekiangensis were used as experimental materials . The Ground diameter and seedling height were used as grading indexes, and the mean士standard deviation method and stepwise cluste- ring method were used to carry out the research on the quality classification of annual seedlings . Found that the standard deviation method to calculate the grade I seedlings under the limit on the high side, stepwise clustering method to calculate grade " seedling lower limit on the high side . The quality classification criteria of annual container seedling of phoebe chekiangensis were determined comprehensively:the diameter of seedling field was above 0. 24cm, and the height of seed- ling was above 13. 0 cm . The seedling diameter of grade II ranged from 0. 15 cm to 0. 24 cm, and the seedling height ranged from 8. 0 cm to 13. 0 cm . Grade I and II seedlings were qualified seedlings, and the control rate of qualified seed- lings was close to 85% .