太白红杉群落交错带物种多样性的研究

应用样带法对太白红杉群落及其交错带进行调查,采用各群落维管植物的物种丰富度指数(S)、 Simpson物种多样性指数(D)、Shannon Weiner物种多样性指数(H′)、种间相遇机率(PIE)及Pielou均匀度 指数(Jsw和Jsi),分析了6条样带的群落结构和物种组成。结果显示在环境条件(土壤和地形)变化较小、层 次结构剧变的群落交错带中,边缘效应明显。而在环境条件较差(即空间波动大)的群落交错带中,边缘效应 不明显,甚至无边缘效应出现。可见,群落的边缘效应不仅受小气候影响,也受地形和土壤等因子的影响。

Studies on species diversity of Larix chinensis community ecotone

The communities of Larix chinensis and their ecotone in Qinling Mountain were investigated by sampling belt method. Species richness index,Simpson diversity index,Shannon-Weiner diversity index,PIE and Pielou evenness index of vascular plant in the communities and their ecotone were calculated. The structure and composition of the communities in 6 sampling belts in these sites were analyzed. The results showed that the edge effect was obvious in the ecotone with a less changing environment(such as soil and terrain)and acute variation of composition and structure,while inconspicuous or even no in the ecotone with worse environmental condition(such as great space fluctuation). It is obvious that the edge effect of community was affected by soil and terrain,and so on,besides microclimate.