为了提高闽楠造林质量,采用主成分、聚类分析、正态分布等方法研究了闽楠轻型基质苗木质量分级标准.结果表明:苗高和地径可作为闽楠轻型基质苗木质量分级指标,采用聚类分析方法与正态分布分级法,得到2种闽楠轻型基质苗木质量的分级标准.通过调查统计不同育苗圃地闽楠轻型基质苗木的生长情况,确定1年生闽楠轻型基质苗木质量分级标准为Ⅰ级苗,H≥35 cm、D≥0.35 cm;Ⅱ级苗,35>H≥20 cm、0.35>D≥0.25 cm.
Grading Standards for Light Media Container Seedling of Phoebe bournei
In order to improve the quality of afforestation of Phoebe bournei,the principal component,cluster analysis and normal distribution were used to study the quality grading standard of lightwood seedling.Result shows that seedling height and ground diameter were selected as the index of quality grading for light media container seedling of Phoebe bournei.Two kinds of quality grading standards of seedling quality were obtained by adopting the method of cluster analysis and the normal distribution classification.According to the investigation and statistics of the growth situation of light media container seedling of Phoebe bournei in different nurseries,the quality grading standards for the light media container seedling of Phoebe bournei were obtained.Seedling height (H) ≥35 cm,ground diameter (D) ≥0.35 cm as grade I.35>H≥20 cm,0.35>D≥0.25 cm as grade II.
Phoebe bourneiseedling gradinglight media container seedling
NETL
NSTL
万方数据
维普
