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中文摘要：
采用逐步聚类分析方法和平均值±标准差法,探讨了苗龄6个月的小桐子苗苗木分级标准。提出以苗高和地径作为小桐子苗木分级的质量标准,得出贵州省小桐子油料能源林造林苗木分级标准,即Ⅰ级苗：苗高≥35 cm、地径≥1.8cm;Ⅱ级苗：35 cm〉苗高≥25 cm、1.8〉地径≥1.4 cm;Ⅲ级苗：苗高〈25 cm、地径〈1.4 cm。
英文摘要：
The standard of methods of gradual cluster seedling grading of the 6-month-old physic nut seedhngs was discussed by using the and average ＋ standard deviation analysis. were proposed as the main indexes of quality for Height and ground diameter of seedlings seedling grading of the forestation of the oil-bearing energy forest of the physic nut, and the grading standards were produced for seedlings in Guizhou province. The seedlings with the height of 35 cm or above, the ground diameter of 1.8 cm or above were classified as grade Ⅰ , those with height lower than 35 cm but higher than or equal to 25 cm, ground diameter lower than 1.8 cm but higher than or equal to 1.4 cm were classified as grade Ⅱ , those with height lower than 25 cm and ground diameter lower than 1.4 cm were classified as grade Ⅲ.
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