中文摘要：

到沿着 Changbai 山的北斜坡的 1900 m 的从 700 m 的社区的种类分发频率被在 1999 的夏天使用 Raunkiaer 的频率分析方法学习。有举起的增加的社区的作文和结构上的变化从频率的观点被显示。尽管在社区之中有差别，结果证明为包括树，灌木和植物的社区的所有种类，频率介绍了鈥淟鈥 ? 形状。高频率种类的百分比随举起的增加增加了。作为在反映种类的重要索引之一空间模式，频率在种类的重要性上面的不仅表演，而且在社区的空间分发的平均。频率数字能在某程度揭示社区的复杂性和差异。

英文摘要：

The species distribution frequency of communities from 700 m to 1900 m along northern slope of Changbai Mountain was studied by using Raunkiaer's frequency analysis methods in summer of 1999. The variation on composition and structure of communities with the increase of elevation was displayed from the point of view of frequency. The results showed that for all the species of community including tree, shrub and herb, the frequency presented a “L” shape even though there were difference among communities. The percentage of high frequency species increased with the increase of elevation. As one of important index in reflecting species spatial patterns, frequency not only show up the importance of species, but also the evenness of spatial distribution in community. Frequency figure could reveal the complexity and diversity of community at some extent.