块根紫金牛种苗质量分级标准研究

为制定科学合理的块根紫金牛种苗质量分级标准，采用相关分析、逐步聚类分析方法对1 年生块根紫金牛种子苗制定分级标准。得出了以地径和株高作为块根紫金牛种苗的分级质量指标，并得出其分级标准，即：I 级种苗：地径≥0.59 cm，株高≥23.82 cm；II 级种苗：0.55 cm≤地径＜0.59 cm，14.94 cm≤株高＜23.82 cm；III 级种苗：地径＜0.55 cm，株高＜14.94 cm。运用逐步聚类分析法制定块根紫金牛种苗质量分级标准，方法可行，结果可靠。

Study on Grading Standard for Ardisia corymbifera var. tuberifera Seedlings

In order to make a scientific and rational grading standard for Ardisia corymbifera var. tuberifera seedlings, the correlation analysis and stepwise cluster analysis method were applied to establish the grading standard for 1-year-old seedlings of Ardisia corymbifera var. tuberifera. The ground diameter and plant height were chosen as the quality indicators for grading. The grading standard for the seedlings of Ardisia corymbifera var. tuberifera worked out as follows: ground diameter≥0.59 cm and plant height≥23.82 cm for grade I seedlings; 0.55 cm≤ ground diameter＜ 0.59 cm and 14.94 cm≤ plant height＜23.82 cm for grade II seedlings; ground diameter＜0.55 cm and plant height＜14.94 cm for grade III seedlings. It is feasible and reliable to use stepwise cluster analysis method to establish the grading standard for Ardisia corymbifera var. tuberifera seedlings.