中条山中段木本植物群落植物种多样性分析

Plant species diversity of woody plant communities in midpiece of Zhongtiao Mountains

采用样方法取样,依据重要值指标运用双向指示种分析(TW INSPAN)法,将山西中条山中段植被群系分成16个群丛。应用丰富度指数(R1、R2)、Simpson指数(λ),Shannon-W einer指数(H′)和均匀度指数(E1、E5)研究了16个群丛的植物种多样性。结果表明:群系植物种多样性指数的大小受立地生境和人为活动的综合影响;森林群落的植物种多样性指数明显高于灌丛群落;群落植物种多样性在空间上的差异不仅决定于物种丰富度指数,更与各物种间的均匀度指数密切相关;进而影响不同层次的物种多样性对群落总体物种多样性的贡献。

62 samples collected in Midpiece of Zhongtiao Mountains were classified into 16 associations by Two-way Indicator Species Analysis（TWINSPAN）. The characteristics of the plant species diversity of 16 associations were studied by using of the formulas of richness indices（R1 ,R5 ） , Simpson＇ s indices （λ）, Shannon-Weiner＇ s indices（H＇） and evenness indices （E1 ,E5 ）. The results indicated that：The species diversity indices of 16 associations varied according to the site conditions and anthropogenic effects; The order of the species diversity indices of the 16 associations showed the species diversity of the arbor-shrub-herbaceous was significantly higher than that of the herbaceous ; differences community species diversities, which are not only determined by species richness indices, but also have a closer relationship with the evenness indices of respective species, thus can influence their respective contributions to the overall species diversity.