摘要:
调查1年生草珊瑚实生苗的生长规律和形态指标, 运用主成分分析和聚类分析方法, 对苗木质量评价和分级标准进行探讨。结果表明:710月是地径和苗高生长旺盛期, 75%遮荫度的生长量最大, 50%遮荫度的地径生长呈现双峰趋势, 在9月间有一个低谷;地径、苗高、根系长和根系数量能直观反映苗木质量, 可作为苗木质量评价的分级指标, 并以此建立了苗木分级标准, 即Ⅰ级苗地径≥0.30cm、苗高≥20.0cm、根系长≥15.0cm、根系数量≥10条;Ⅱ级苗地径≥0.20cm、苗高≥15.0cm、根系长≥10.0cm、根系数量≥8条;达不到Ⅱ级苗标准的为不合格苗。
Abstract:
The evaluating and grading standards for Sarcandra glabra seedling quality were studied with principal component analysis and cluster analysis methods by observing the annual growth regularity and morphological indices of one-year-old Sarcandra glabraseedling.The results showed that the diameter and height grew faster that other periods from July to October, and reached the maximum when the shading range was 75%.The diameter growth presented double peak at 50% shading rate, and showed a low value in September.The seedling quality could be directly evaluated by the ground diameter, seedling height, and root length and quantity, which could classify the Sarcandra glabra seedling as follows:GradeⅠ, ground diameter≥ 0.30cm, seedling height≥20.0 cm, root length≥15.0cm and root number≥10;Grade II, ground diameter≥ 0.20cm, seedling height≥15.0 cm, root length≥10.0cm and root number≥8.Those seedlings which any index doesn′t meet the standard of Grade II were regarded unqualified.
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