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。
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.
出处
《种子》
CSCD
北大核心
2008年第9期29-33,共5页
Seed
基金
国家林业局科技推广项目“麻疯树良种与优质丰产栽培配套技术示范推广”(编号[2007]12)
“贵州主要野生木本生物质燃料油树种筛选、评价和保存”(编号[2006]-17)资助
关键词
小桐子
播种苗
苗木分级
逐步聚类
平均值±标准差法
physic nut （Jatropha curcas L. ）
tree seedling
seedling grading
gradual cluster analysis
average ＋ standard deviation analysis
