[Comparative analysis on species diversity of hillclosed afforested plant community in Beijing Jiulong Mountain].

The plant communities in Beijing Jiulong Mountain were surveyed with the Quadrate. The species diversity characteristics of the tree layer and the shrub layer and herb layer of these plant communities were measured by applying Shannon-Wiener diversity index(D), evenness index(J) and ecological dominance(C), and the comparison of the characteristics was conducted on shade slope and sun-faced slope. The results showed that these indices could effectively reveal the characteristics of species composition for plant communities in warm temperate zone. On shade slope or sun-faced slope, the D value of shrub layer in Jiulong shrub communities (SC) was higher than that of tree layer in arbor forest (AF), but lower than that of shrub layer in AF; the D value of herb layer in SC was lower than that of herb layer in AF; and the D value of herb layer was higher than that of shrub layer in AF, which was higher than that of tree layer in AF. C value presented quite the opposite with D value, and J presented the different feature in the comparison, respectively on shade slope and sun-faced slope. In addition, the succession series and the restoration measures on accelerating the progressive succession of the hillclosed afforested vegetation communities were tentatively discussed.