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对春季叶和秋季叶杜仲胶含量及水溶物含量的测定结果表明，４１种无性系间的含胶量与水溶物含量都存在着极显著差异。杜仲叶中胶的积累和水溶物的积累具有不同规律。春叶的含胶量约为秋叶的２倍，单位面积秋叶的水溶物含量约为同面积春叶的３倍。为选育优良杜仲无性系和适宜的采叶时间提供了依据
The results of the determination of leaf gum content and water-soluble content of leaves and leaves in spring and autumn showed that there were extremely significant differences in the content of gel and water-soluble substances among 41 clones. Eucommia leaf gum accumulation and accumulation of water soluble matter have different laws. The content of the gel of the spring leaves is about 2 times that of the autumn leaves, and the content of the water soluble matter per unit area of the autumn leaves is about 3 times of that of the spring leaves of the same area. This provided the basis for breeding elite Eucommia clones and suitable time for harvesting leaves