Abstract: Based on environment gradient of different sample sites, the species diversity of Q. liaotungensis forest in Do ngling Mountain was studied primarily by α-diversity indexes and β-diversity indexes. The results showed that species α-diversity of arbors and shrubs species in Q. liaotungensis forest declined gradually along environment gradient of different quadrats but its changing range was less. Species constitute of forest inclined to simpleness. Based on environment gradient of different quadrats, different effects on β-diversity of overall Q. liaotungensis forest were revealed by arbor and shrub species diversity analysis with α-diversity indexes and β-diversity indexes. The species number and species quantity was adopted synthetically by β-diversity measure of quantitative data and this method was suited to analyze species diversity of dominant species community. During middle altitude gradient of quadrats, species β-diversity values were little between quadrat pairs of arbor and shrub species in Q. liaotungensis forest, which displayed that the species turnover rate of Q. liaotungensis forest was low and species constitute was stabilization to a certain degree. As a whole, Q. liaotungensis forest was stable forestry.

Key words: Q. liaotungensis forest, β-diversity, ligneous plant