Study on the Dynamics of Herbs' Diversity in Korean Pine Broad-leaved Forest and Secondary Forest in Changbai Mountains

The dynamics of diversity of woodland herbs was studied in Korean pine broad-leaved forest and secondary forest.Results show that the diversity has a great change in different months.There are about 179 species of herbs being surveyed in the study,in which 125 species are found in Korean pine broad-leaved forest,and 160 species in relevant secondary forest.The species and biodiversity have changed obviously between months.The number of species,the Simpson index,the Shannon-wiener index and the Evenness index are all in a process of increase,and then decrease.The number of species in relative secondary forest is obviously more than in Korean pine broad-leaved forest. There are more obviously vertical laminations for the herbs' height in Korean pine broad-leaved mixed forest.And over the whole growing season,the average height in the secondary forest is higher.The article tries to discuss the inner rule of herbs' diversity in a steady ecosystem formed by Korean pine broad-leaved mixed forest.