Effects of altitude and topography on species richness of vascular plants, bryophytes and lichens in alpine communities
Effects of altitude and topography on species richness of vascular plants, bryophytes and lichens in alpine communities
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DOI：
10.1111/j.1654-1103.2006.tb02421.x
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发表时间：
2006-02-01
影响因子：
2.8
通讯作者：
Angerbjörn, A
中科院分区：
文献类型：
--
作者：
Bruun, HH;Moen, J;Angerbjörn, A
问：维管植物的物种丰富度与高山环境中的两个重要梯度，海拔和当地地形之间的关系是什么？位置：芬兰斯堪的纳维亚最北端，海拔250-152米方法：在6个山区进行植被调查。对于每25垂直米，在0.8 m x 0.8 m的样方中对从风吹山脊到雪床的局部地形梯度进行采样。物种丰富度的模式进行了探讨，使用泊松回归（广义线性模型）。功能群的物种，即万年青和落叶矮灌木，杂类草，禾本科植物，苔藓，hepatics和地衣分别调查。所有维管植物的物种丰富度与海拔呈单峰关系。禾本科、杂类草和地衣分别分析，也是如此，但杂类草丰富度的峰值比总丰富度高得多。矮灌木的丰富度随海拔的升高而单调下降，苔藓和地钱的丰富度则呈上升趋势。海拔高度和当地地形之间存在显着的相互作用，为几个群体。总植物物种丰富度的单峰模式被解释在当地的生产力，物理干扰，营养相互作用，并在物种库effects.Conclusions：在当地的物种丰富度的格局从两个相反的力量的作用：下降的物种库和降低竞争强度与海拔。
Question: What is the relationship between species richness of vascular plants, bryophytes and macrolichens, and two important gradients in the alpine environment, altitude and local topography?Location: Northernmost Fennoscandia, 250-152 m a.s.l. corresponding to the range between timberline and mountain top.Methods: The vegetation was sampled in six mountain areas. For each 25 vertical metres, the local topographic gradient from wind-blown ridge to snowbed was sampled in quadrats of 0.8 m x 0.8 m. Patterns in species richness were explored using Poisson regression (Generalized Linear Models). Functional groups of species, i.e. evergreen and deciduous dwarf-shrubs, forbs, graminoids, mosses, hepatics and lichens were investigated separately.Results: Functional groups showed markedly different patterns with respect to both altitude and topography. Species richness of all vascular plants showed a unimodal relationship with altitude. The same was true for graminoids, forbs and lichens analysed separately, but forb richness peaked at Much higher altitudes than total richness. The richness of dwarf-shrubs decreased monotonically with altitude, whereas richness of mosses and liverworts showed an increasing trend. Significant interactions between altitude and local topography were present for several groups. The unimodal pattern for total plant species richness was interpreted in terms of local productivity, physical disturbance, trophic interactions, and in terms of species pool effects.Conclusions: Patterns in local species richness result from the action of two opposing forces: declining species pool and decreasing intensity of competition with altitude.