秦岭及陕北黄土区辽东栎林群落物种多样性特征

应用５种物种多样性测度指标及４种物种—多度分布模型对秦岭和黄土区辽东栎林种子植物物种多样性及木本植物种—多度分布进行了对比研究，结果表明：秦岭辽东栎林无论是群落物种多样性还是各层次的物种多样性均高于黄土区辽东栎林。秦岭辽东栎林木本植物种—多度分布符合对数正态分布而黄土区辽东栎林则符合对数级数分布，分布区气候差异是造成两类辽东栎林物种多样性差异的主要原因。物种—多度分布分析与物种多样性分析结果是一致的。

SPECIES DIVERSITY OF HIGHER PLANT OF QUERCUS LIAOTUNGENSIS FOREST IN QINLING MOUNTAIN AND THE LOESS PLATEAU

The species diversity indices and the species abundance distribution of Quercus liaotungensis forest in Qinling mountain and the loess plateau were studied.The results are as follows:(1) The species diversity of Qinling is higher than that of the loess plateau,while the species richness of these two kinds of forest are almost the same.(2) Species abundance distribution of woody plant in Qinling Quercus liaotungensis forest obey a log normal distribution,while that of the loess plateau obey a logarithmic series distribution.(3) The differences between the climate of the two distribution areas are the main reasons which give rise to the differences of diversity and species abundance distribution between these two kinds of Quercus liaotungensis forest.(4) The result of the study of species abundance distribution of woody plant is the same as that of species diversity indices.