研究结果表明 :杜仲人工林冠幅大小是直接影响杜仲鲜叶产量最关键的相关因子 ,其次是树高和胸径。而杜仲丛干数多少对杜仲鲜叶产量影响仅为冠幅贡献率的 2 6 49%。而影响杜仲丛干皮重和全株皮重最主要的相关因子是杜仲胸径大小 ,其次是丛干数多少和冠幅大小。这些结论可为杜仲人工林不同经营目的在优良类型选择上提供了依据 The results showed that crown size of Eucommia ulmoides plantation was the most important factor that directly affected the yield of fresh leaves of eucommia bark, followed by tree height and DBH. However, the number of eucommia plexus stems affected the yield of fresh leaves of eucommia only 269% of the contribution rate of crown. The most important factor influencing the dry tare weight and total tare weight of Eucommia ulmoides was Eucommia bark size, followed by the number of clumps and crown size. These conclusions may provide the basis for choosing different types of elite plantations for different management purposes