印度紫檀苗木分级研究

Study of Seedling Grading of Pterocarpus indicus

采用逐步聚类分析方法,对印度紫檀容器苗苗木的分级标准进行了探讨。提出了以苗高和地径作为该树种苗木分级的质量指标,并得出印度紫檀苗木的3类(级)分级标准,即:Ⅰ级苗:苗高≥29 6cm,地径≥0 33cm;Ⅱ级苗:29 6cm〉树高≥19 6cm,0 33cm〉地径≥0 27cm;Ⅲ级苗:树高〈19 6cm,地径〈0 27cm。

The standard of seedling grading of Pterocarpus indicus was studied by using the methods of gradual cluster analysis. Seedling height and basal diameter were proposed as the main indexes of quality for seedling grading of this species. The following indexes were produced for seedlings of the first to the third grade. The seedlings with height of 29.6 cm or above, basal diameter of 0.33 cm or above were classified as grade one, those with height lower than 29.6 cm but higher than or equal to 19.6 cm, basal diameter lower than 0.33 cm but higher than or equal to 0.27 cm were classified as grade two, those with height lower than 19.6 cm and basal diameter lower than 0.27 cm were classified as grade three.