水杉插条的成活率随母树年龄的增长而下降,这一事实在苗圃生产中已为人们所熟悉。但究竟是由什么原因所引起,目前尚缺少理论上的探讨。“外因是变化的条件,内因是变化的根据”,按照这一原则,我们试图从生理学方面探求影响插条生根的内因,通过实验已明显地看出,母树年龄随插条生根与成活的影响乃是与枝条内的生长促进物质和抑制物质的含量有关。 The fact that the survival rate of Metasequoia cuttings decreases with the age of the mother tree is already well known in nursery production. However, what causes it, and there is still no theoretical discussion yet. According to this principle, we try to explore the internal factors that affect the rooting of cuttings from the perspective of physiology. It has been clearly shown through experiments that the age of the mother tree is affected by the rooting and survival of cuttings But with the branches of growth-promoting substances and inhibitory substances content.