关键词: 长白山, 原始红松林, 次生林, 树种多样性, 胸径多样性

Abstract: The tree species diversity and DBH diversity of the secondary forests on the north slope of Changbai Mountains were studied and compared with that of virgin Korean pine forest by using Margalef species richness index, Shannon Wiener diversity index, Pielou evenness index and Simpson dominance index through the methods of field investigation and indoor analysis. It was shown that: (1)Tree species diversity index H and evenness index J were bigger, richness index S and ecological dominance index D were smaller in the secondary forest than those in virgin Korean pine forest. DBH ecological advantages index D, richness index S and diversity index H of the secondary forest were smaller than those of virgin Korean pine forest. DBH evenness index of the secondary forest was similar to that of virgin Korean pine forest. DBH richness index and diversity index of the poplar-birch forest were the biggest, and those of Juglans mandshurica Maxim. forest were the smallest among three secondary forests. DBH evenness index and dominance index changed oppositely to DBH richness index and diversity index among three secondary forests; (2)Tree species diversity and DBH diversity changed with the same pattern. Tree species diversity index and evenness index, DBH richness index and diversity index increased gradually, tree species and DBH dominance index decreased gradually with forest age increased. (3)Either virgin Korean Pine forest or secondary forests, tree species diversity would reduce after cutting, the stronger the cutting intensity, the greater the decrease degree. The response of the DBH diversity to the cutting intensity was complex, which was associated with the cutting methods.

Key words: Changbai Mountains, Virgin Korean pine forest, secondary forest, tree species diversity, DBH diversity