摘要
采用逐步聚类分析方法,对苗龄210 d的云南蓝果树容器苗苗木分级标准进行探讨。提出了以苗高和地径作为该树种苗木分级的质量指标,并得出了云南蓝果树3级苗木的分级标准,即Ⅰ级苗:苗高≥26.4 cm,地径≥0.44 cm;Ⅱ级苗:26.4>苗高≥19.44 cm,0.44 cm>地径≥0.37 cm;Ⅲ级苗:苗高<19.44 cm,地径<0.37 cm。
The grading standard of 7 months old Nyssa yunnanensis container seedlings was studied using the method of gradual cluster analysis. Seedling height and basal diameter were proposed as the main indices of quality grading. Seedlings with the height of 26.4 cm or above, basal diameter of 0.44 cm or above were classified as the first grade, those with the height lower than 26.4 cm but higher than or equal to 19.44 cm, basal diameter lower than 0.44 cm but higher than or equal to 0.37 cm were classified as the second grade, those with height lower than 19.44 cm and basal diameter lower than O. 37 em were classified as the third grade.
出处
《林业科技开发》
北大核心
2013年第2期59-62,共4页
China Forestry Science and Technology
基金
国际热带木材组织(ITTO)资助"中国热区面向农户的人工林营建技术开发与推广"(编号:PD501/08Rev.1[F])
云南省技术创新人才培养项目(编号:2011CI069)
关键词
云南蓝果树
容器苗
苗木分级
逐步聚类
Nyssa yunnanersis
container seedling
seedling grading
gradual cluster analysis
