Species richness of Colorado riparian vegetation
Species richness of Colorado riparian vegetation
复制标题
科罗拉多河岸植被的物种丰富度
DOI：
10.2307/3236061
复制
发表时间：
1990
影响因子：
2.8
通讯作者：
W. Baker
中科院分区：
文献类型：
--
作者：
W. Baker
植物群落多样性在全球和地方尺度上的空间变异的可能原因已被广泛研究，但区域尺度却很少受到关注。目前还不清楚干扰如何影响湿地和河岸植被的多样性。本研究检验了河岸湿地丰富度的区域变化与宏观环境和洪水潜势的变化有关的假设。维管植物物种丰富度采样0.1公顷的地块在115个河岸网站分散在一个300公里长的西坡的落基山脉在西部科罗拉多，美国。采用相关分析和多元回归分析方法，分析了流域面积等宏观环境变量、干扰指标与物种丰富度之间的关系。总丰富度变化20和87种（平均50.6）每0.1公顷，是最高的亚高山河岸林从2600-3650米海拔。(57.8物种/ 0.1公顷）。乔木和灌木的丰富度在低海拔、大流域最高，杂类和禾本科植物的丰富度在高海拔、小流域最高。这些相反的趋势导致总丰富度没有净趋势与海拔。总体富裕程度的回归模型很差，这表明其他变量一定很重要。中等干扰假说和其他单因子假说不能解释丰富度的区域变化格局。
The probable causes of spatial variation in the diversity of plant communities on a global and local scale have been widely investigated, but the regional scale has received little attention. It remains unclear how disturb- ance affects diversity in wetlands and riparian vegetation. This study examines the hypothesis that regional varia- tion in the richness of riparian wetlands is related to variation in macro-environment and flood potential. Vascular plant species richness was sampled in 0.1 ha plots at 115 riparian sites scattered over a 300 km length of the western slope of the Rocky Mountains in western Colorado, USA. The relationship between macro-envi- ronmental variables (e.g. drainage basin area), disturb- ance indicators, and species richness was analyzed using correlation analysis and multiple regression analysis. Total richness varied between 20 and 87 species (average 50.6) per 0.1 ha, and was highest in subalpine riparian forests from 2600-3650 m a.s.l. (57.8 species / 0.1 ha). Tree and shrub richness were highest in lower elevation, larger drainage basins, forb and graminoid richness were highest in higher elevation, smaller drainage basins. These opposing trends resulted in no net trend in total richness with elevation. Regression models for total rich- ness were poor, suggesting that other variables must be important. The intermediate disturbance hypothesis and other single-factor hypotheses are not supported as expla- nations of the regional pattern of variation in richness.