桂北地区银杏苗木质量分级标准  

Grading Standard of Ginkgo biloba. Seedling Quality in the Northern Area of Guangxi

作　　者：蒋冬生 唐红莲 覃宏明 龙九付 

机构地区：[1]桂林林校,广西桂林541004 [2]阳朔林业局,广西桂林541900 [3]灵川林业局,广西桂林541200

出　　处：《林业科技》2015年第4期29-32,共4页Forestry Science & Technology

基　　金：桂林市科技局(项目编号:201503066548)

摘　　要：通过对兴安、灵川和阳朔3个地区培育的1年生银杏播种苗小样方随机抽样调查,确定了地径和苗高为苗木分级的质量指标;用标准差法和聚类分析法对银杏苗木质量的分级标准进行了探讨比较,并结合生产实际确定了桂北地区银杏1年生播种苗木标准,Ⅰ级苗:地径≥0.98 cm,苗高≥19.94 cm;Ⅱ级苗:0.98 cm>地径≥0.73 cm,19.94 cm>苗高≥17.23 cm。The 1 year old Cinkgo biloba seedlings in Xingan, Lingchuan, Yangshuo were investigated by random sampling in the small sample plots. After a correlation analysis was conducted on the comprehensive index such as seedling ground diameter, seedling height, taproot length, the number of lateral root, root width, terminal bud, lignification, the ground diameter and seedling height were determined as a quality indicator of seedling grading. And then it was studied by the standard deviation method and the cluster analysis method as well as in the actual production in northern Guangxi. The results as follows： I： ground diameter ≥ 0.98cm, seedling height ≥ 19.94 cm; II： 0.98 〉 ground diameter〉 0.73cm, 19.94 〉 seedling height 〉 17.23 cm.

关 键 词：银杏 苗木分级 标准差 聚类 

分 类 号：S792.95[农业科学—林木遗传育种] S723.4[农业科学—林学]