Abstract: This paper discusses species richness, evenness and species diversity of higher plants in deciduous broadleaved forests on the northern slope of Taibai Mountain. The results show that along the temperature and rainfall gradient, species diversity fluctuates greatly. The species diver-sity in the Quercus aliena var. acuteserata forest is the highest in six types of the forests. The spe-cies diversity index and evenness index for different strata is in the following order: shrub stratum > herb stratrum > tree stratum. As for the species richness, the order is herb stratum > shrub stratum > tree stratum. All of the five indices in shrub stratum are with very small variation among communities while those in tree stratum and herb stratum vary considerably.

Key words: Taibai Mountain