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首页> 外文期刊>Journal of Vegetation Science >Positive effects of shrubs on herbaceous species richness across several spatial scales: evidence from the semiarid Andean subtropics
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Positive effects of shrubs on herbaceous species richness across several spatial scales: evidence from the semiarid Andean subtropics

机译：灌木在几个空间尺度上对草本植物物种丰富性的积极影响：来自半干旱安第斯亚热带的证据

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QuestionWhat is the effect of shrubs on herbaceous species richness at three spatial scales: quadrat, site, and region?LocationPrepuna, subtropical semi-arid Andes.MethodsAt eight sites, we recorded the presence of herbaceous species in spaces beneath shrubs/small trees and in open areas. At the quadrat scale, the average species number per quadrat was calculated and compared between the two microhabitats (shrubs/open). At the local (site) scale, all quadrats of each site were pooled according to microhabitat, and all sites were then combined for the regional analysis.Results and conclusionsWe found greater herbaceous species richness below shrubs at all three spatial scales considered. Several species were found exclusively associated with the shrub undercanopy. This effect seems to depend more on greater inventory diversity at the different scales than on greater differentiation diversity in the herbaceous communities associated with shrubs. Facilitation seems to be responsible for the increase of species richness beneath shrubs, but further experimental study is needed to obtain insight into the underlying mechanisms.
机译：问题在三个空间尺度上，灌木对草本物种丰富度有什么影响：方型，场所和区域？位置Prepuna，亚热带半干旱安第斯山脉方法在八个场所，我们记录了灌木/小树下和树丛中空间中草本物种的存在。开放区域。在正方形尺度上，计算每个正方形的平均物种数，并在两个微生境之间进行比较（灌木/开放式）。在局部（站点）尺度上，根据微生境将每个站点的所有四足动物合并，然后将所有站点合并以进行区域分析。结果与结论我们发现，在所有三个空间尺度下，灌木以下的草本物种丰富度都较高。发现有几种物种仅与灌木丛的冠层相关。这种效应似乎更多地取决于更大规模的不同物种的存量多样性，而不是更大的灌木丛相关草本群落的分化多样性。促进作用似乎是灌木下物种丰富度增加的原因，但需要进一步的实验研究才能深入了解其潜在机制。

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