Abstract: Simpson and Shannon diversity indices and their eveness are used to analyse the difference of diversity of higher plants in broad-leaved Korean pine forest and secondary birch forests.The results show that the species diversity of higher plahts in secondary birch forest is higher than that in broad-leaved Korean pine forest for woody plants, but for herbs,the latter is higher.Many of rare species existed in broad--leaved Korean pine forest are few or absent in secondary birch forest.Species abundance distributions of both woody plants and herbs in these two forests obey a logarithmic series distribution.

Key words: Species diversity, Broad-leaved Korean forest, Birch forest, Species abundance distribution