【摘要】 采用固定样地和随机样地的方法对广西大化县退耕还林尾叶桉模式和任豆模式植被进行了调查,分析两种退耕模式的植被种类数、植被覆盖度、植被群落的变化及其物种多样性。结果表明:两种退耕模式林下植被种类数均呈上升的趋势,且林下植被种类数之间并没有很显著的差异;两种退耕模式林下植被覆盖度均呈逐年上升趋势,且林下植被植被覆盖度之间亦没有很显著的差异;尾叶桉模式多样性指数呈灌木层>草本层,而任豆林则呈现出草本层>灌木层的进化演替初期群落的状态;尾叶桉林下植被中,灌木优势种类相对比较丰富,草本优势种类亦比较丰富,而任豆林下植被中,灌木优势种类比较单一,而草本优势种类则比较丰富。更多还原

【Abstract】 The vegetation in Eucalyptus urophylla and Zenia insignis models for conversion of cropland to forest in which Dahua county were investigated by the way of fixed sample and random sample.The number of vegetation, vegetation fraction,movement of vegetation communities and species diversity were also anyalzed.The result showed that: Ascending trend in the number of vegetation are found in two models for conversion of cropland to forest,and there was no significant difference between the two vegetations.The result of vegetation fraction are the same to the the number of vegetation.The species diversity of shrub layer is higher than the herb layer in Eucalyptus urophylla model,but it is opposite to the model of Zenia insignis,that is The species diversity of shrub layer is lower than the herb layer.The advantage species of shrub and herb are abundant relatively in understorey vegetation of Eucalyptus urophylla.Understorey vegetation of Zenia insignis,however,the advantage species of shrub is single and the advantage species of herb is abundant.更多还原