【摘要】 采用丰富度指数、多样性指数、均匀度指数对雾灵山不同森林类型灌木层和草本层的物种多样性进行了研究,并在此基础上用逐步回归方法研究影响森林物种多样性的主要因子。结果表明,在不同森林类型中灌木层和草本层物种多样性由高到低依次为:针阔混交林>落叶阔叶林>针叶林;多数森林类型草本层丰富度指数和多样性指数均高于灌木层,而均匀度指数则相反。影响灌木层物种多样性的主要因子包括林龄、郁闭度和坡向,影响草本层物种多样性的主要因子包括林分公顷株数、郁闭度和土层厚度。更多还原

【Abstract】 By using the indexes of richness,diversity and evenness,the species diversity of shrub and herb layers of different forest types in Wuling Mountain is researched in this paper,and stepwise regression model is used to find major factors affecting species diversity.The results show that the species diversity of shrub and herb layers of different forest types from high to low is coniferous and broad-leaved mixed forest>deciduous broad-leaved forest> coniferous forest;Most forest types,the diversity and richness indexes of herb layer are higher than those of shrub layer,while the evenness index is opposite.The major factors affecting species diversity of shrub layer include age,canopy density and slope.The major factors affecting species diversity of herb layer include stand density, canopy density and soil depth.更多还原