对湖北宜昌大老岭分布较为广泛的米心水青冈群落物种多样性从Simpson多样性指数、Shannon -Wiener多样性指数、基于上述两个指数所计算出来的群落均匀E和E′、种间相遇机率和丰富度指数等几个方面进行测定分析 ,结果表明 :在立地条件基本一致的情况下 ,木本植物的丰富度和物种多样性和丰富度指数高于草本层和乔木层 ;群落均匀度和种间相遇机率各层之间的差异不很明显 Species diversity of Fagus engleriana distributed more widely in Dalaoling, Yichang, Hubei Province from Simpson diversity index, Shannon-Wiener diversity index, community E and E ’calculated based on the above two indices, interspecific encounter Probability and richness index. The results showed that the richness, species diversity and richness index of woody plants were higher than those of herbaceous and arborous layers under the same site conditions. The evenness The differences between the layers and the probability of inter-species encounter are not obvious