Systematic studies of the dynamic formation and accumulation of gutta-percha in Eucommia ulmoides Oliv . leaves were conducted to explore the annual and year-to-year characteristics and regularities of gutta-percha content the content change in the leaves on different positions and the growth of leaves .

通过对杜仲叶内杜仲胶形成与积累的动态进行全面系统的研究，探索杜仲叶含胶性状年 变化 和 逐年 变化的特点和规律以及不同着生部位叶片含胶率 随 叶龄变化的规律。