<正>刺槐是重要的用材树种之一，通过研究其木纤维分子的长度、宽度与材积生长量的关系，可知其木纤维分子长度、宽度变化规律与其胸径生长量的变化规律有共同的特点。且木纤维分子长度、宽度达到最大值时的年龄和刺槐的数量成熟龄相一致。由此可做为幼年材和成熟材、幼龄林和成熟林的划分标准，同时为更好地进行森林经营提供理论依据。

This paper studied the relation of fiber length. width and growth curve of volume of Robinia pseudoacacia.L.These have the same rule with the growth curve of volume.Delimitation betweenjuvenile and mature woods,juvenile and mature forest should be identified by using the age as quantitative maturity when the fiber length. width has been maximal.