【摘要】 本文对杜仲优良无性系前６年树高、胸径、产皮量、产叶量与树龄的相关关系进行了调查分析。结果表明，各无性系前６年树高、胸径生长的相关性均达到极显著水平。产皮量、产叶量与树龄呈非线性关系，相关指数接近１，产皮量、产叶量与树龄的相关关系密切，分析结果为杜仲优良无性系的早期选择提供了理论依据更多还原

【Abstract】 A correlation analysis was carried out among the age of fine E. ulmoides clones and height, diameter of breast height (DBH), bark and leaf yields in the first six years. The result revealed that correlations of the age and height, DBH reached to very high levels, while correlations of the age and yields of bark and leaves existed nonlinear with a correlation index of about 1. There existed close correlations among the age and yields of bark and leaves. The results provide a theoretical basis for the selection of fine Eucommia clones in early stage.更多还原