【摘要】 为科学合理制定银荆菌材林的造林苗木出圃规格，运用相关性分析及主成分分析、聚类分析和正态分布方法，对长顺县培育的银荆一年生播种苗木质量进行分级评价研究。结果表明：地径是银荆一年生播种苗木质量分级的优先指标，苗高为辅助指标；调查样本逐步聚类分级结果更精准并且切合生产实际，均值比例法的60%或70%作为Ⅱ级苗的初始分级进行逐步聚类分级结果较其他方法更合理；Ⅰ级苗地径D>0.80 cm且苗高H>100 cm,Ⅱ级苗地径0.40 cm≤D≤0.80 cm且苗高H≥50 cm,Ⅲ级苗地径0.20 cm≤D<0.40 cm且苗高H≥30 cm。贵州营造银荆菌材林的苗木出圃规格为D≥0.50 cm且H≥50 cm,建议使用Ⅰ级规格的截干苗营造短轮伐期菌材林。更多还原

【Abstract】 Seedling specifications out of nursery are required in the afforestation on the timber-forest for the edible fungus of Acacia dealbata Link.In this study, the correlation, the principal component, the cluster analysis, and the normal distribution were carried out to evaluate the annual sowing seedlings quality of Acacia dealbata in Changshun County, Guizhou Province of China.The results showed that the priority index was the ground diameter for the grading quality of one-year Acacia dealbata seedlings, and the auxiliary index was the seedling height.The stepwise clustering with the graded survey samples was more accurately performed for the production.It was more reasonable to assume 60% or 70% of the mean proportion method as the initial grading of the second-grade seedlings in stepwise clustering, compared with the rest.The first-grade seedlings were classified by the ground diameter(D) > 0.80 cm and the seedling height(H) > 100 cm.The second-grade seedlings were 0.40 cm ≤ D ≤ 0.80 cm and H ≥ 50 cm.The third-grade seedlings were 0.20 cm ≤ D < 0.40 cm and H ≥ 30 cm.Therefore, the seedlings size of D ≥ 0.50 cm and H ≥ 50 cm can be the seedlings specifications out of nursery for the afforestation of the timber-forest for edible fungus of Acacia dealbata in Guizhou Province.The first-grade seedlings can also be utilized for the cutting stem in the short-rotation timber-forest for the edible fungus.更多还原