[Objective]To study the relationship between microtopography and vegetation diversity.[Method]A forest monitoring plot of 1 hm2 was established in a secondary southern subtropical evergreen broadleaved forest in Dapingzhang Forest Park and conducted a tree census.The correlations between microtopographic conditions and forest plant diversity were tested.[ Result]①It recorded 2209 individuals of 45 species from 38 genera and 24 families in the 1 hm2 forest plot, with a density of 0.2209 individuals/m2 .The forest plot was dominated by Cyclobalanop-sismyrsi-naefolia.The Shannon-Wiener index and the evenness of the forest plot were 1.29 and 0.56, respectively.②Plant diversity index was highest on the abrupt slope(1.46) and lowest on the steep slope(1.19).③Plant diversity index on different aspects ranked form big to small as follows:north aspect(1.95), west aspect(1.47), east aspect(1.31), south aspect(0.95).④Plant diversity index on the upslope positions (1.43) was similar with that on the downslope positions(1.40), and that on the midslope positions was lowest(1.29).[Conclusion]The results can serve as references to further exploration of the underlying mechanisms of species diversity maintenance.%[目的]研究微地形与植被多样性的关系.[方法]设置1 hm2大样地,调查大屏嶂森林公园南亚热带次生常绿阔叶混交林的树木性状,分析微地形与森林植被多样性指数的关系.[结果]①1 hm2大样地内共记录到2209个植株,含24科38属45种.优势树种为杨梅叶青冈(Cyclobalanopsismyrsi-naefolia)等树种.单位面积植株密度为0.2209株/m2.植被多样性指数的平均值为1.29,均匀度指数的平均值为0.56.②陡坡的植被多样性指数最高(1.46),其次为缓坡(1.28),最低的是急坡(1.19).③各坡向的植被多样性指数从大到小依次为北向(1.95)、西向(1.47)、东向(1.31)、南向(0.95).④上坡和下坡的植被多样性指数相当(1.43和1.40),而中坡的相对较低(1.29).[结论]该研究可为更深入地研究该地区的物种多样性维持机制等提供基础资料.
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