摘要
选择苗高和地径作为苗木分级指标,采用逐步聚类分析方法对4个月苗龄的皂荚穴盘苗进行分级标准研究。得出分级标准:皂荚穴盘苗Ⅰ级苗,苗高H≥26.5 cm,地径D≥0.48 cm;Ⅱ级苗,26.5 cm>苗高H≥22.8 cm,0.48 cm>地径D≥0.42 cm;Ⅲ级苗,苗高H<22.8 cm,地径D<0.42 cm.
The grading standard of 4-month-old plug seedling of Gleditsia sinensis was studied by using stepwise cluster analysis method with seeding height and ground diameter as the grading index. The grading standard showed that height≥26.5 cm and ground diameter≥0.48 cm as gradeⅠ, 26.5 cm〉height≥22.8 cm and 0.48 cm〉ground diameter≥ 0.42 cm as grade Ⅱ, height〈22.8 cm and ground diameter〈0.42 cm as grade Ⅲ.
作者
赵育鹏
Zhao Yupeng(Shanxi Academy of Forest Sciences,Taiyuan 030012,China)
出处
《山西林业科技》
2018年第3期27-30,共4页
Shanxi Forestry Science and Technology
基金
山西省科技攻关项目
关键词
皂荚
穴盘苗
苗木分级
逐步聚类分析
Gleditsia sinensis
Plug seedling
Seedling grading
Stepwise cluster analysis
