崀山丹霞地貌区天然常绿阔叶林群落物种多样性研究

 采用样方法采集数据,以重要值为测度指标,以丰富度指数D2、Simpsom指数D1、Shannon-Wiener指数H′、Sheldon均匀度指数JSW和Pielou均匀度指数E为测度指数,研究了崀山丹霞地貌14个天然常绿阔叶林群落物种多样性。结果表明:1)在相似生境中,随着群落演替至亚顶极阶段,物种多样性的变化趋势是增加的,顶极群落中,生境变优,灌、草层物种多样性的变化趋势为增加,而乔木层无明显变化规律;2)群落物种多样性随海拔的变化,除一般常见的变化模式外,还出现一种双峰曲线模式;3)H′较D1,E较JSW具有较高的敏感度。D1与H′在描述群落乔、灌、草,H′与E、D1与E、JSW与E在描述乔木,JSW与E在描述草本之间物种生物多样性上有相似的作用。表明:丹霞地貌中海拔、生境和演替影响植物群落物种多样性,H′、D1JSW与E能单独表达丹霞地貌群落物种多样性。

Species diversity of natural evergreen broadleaf forest community in Danxia landform area of Langshan Mountain

Using the sampling method to collect data,the important values for measure indicators,and using richness the index D2,Simpsom index D1,Shannon-Wiener index H′,Sheldon evenness index JSW and Pielou evenness index E as the measurement index,the community species diversity of 14 natural evergreen broad-leaved forest in Danxia landform area of Langshan Mountain were studied.The results showed that： 1） In similar habitat,along with the syngenesis to the subclimax stage,the change tendency of species diversity is increasable.In the climax community,the change tendency of species diversity of shrubs and herbs was increasable,but arbor have no obvious change.2） Community species diversity was changed with elevation change,besides general common change pattern,but also presents one kind of bimodal curve pattern.3） H′ and E have higher sensitivity than D1 and JSW.There is a significant similar function among with descries species diversity of arbors,shrubs,and herbs with D1 and H′,and descries species diversity of arbors with H′ and E,D1,and E,JSW and E,and descries species diversity of herb with JSW and E.It was concluded that elevation,habitat and succession affect community species diversity in Danxia landform,H′、D1、JSW and E can individually express Danxia landform community species diversity.