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首页> 美国卫生研究院文献>AoB Plants >Presence of a dominant native shrub is associated with minor shifts in the function and composition of grassland communities in a northern savannah
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Presence of a dominant native shrub is associated with minor shifts in the function and composition of grassland communities in a northern savannah

机译：在北大草原中的草地社区的功能和组成中占主导地位灌木的存在与草地社区的功能和组成有关

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Ecosystems are spatially heterogenous in plant community composition and function. Shrub occurrence in grasslands is a visually striking example of this, and much research has been conducted to understand the functional implications of this pattern. Within savannah ecosystems, the presence of tree and shrub overstories can have significant impacts on the understory herbaceous community. The exact outcomes, however, are likely a function of the spatial arrangement and traits of the overstory species. Here we test whether there are functional linkages between the spatial patterning of a native shrub and the standing biomass, community composition, and overall nutrient cycling of a neighbouring grassland understory communities within the Aspen Parkland of central Alberta, Canada. In a paired grassland-shrub stand study, we found the native shrub, Elaeagnus commutata, has relatively few stand-level impacts on the composition and standing biomass of the ecosystem. One factor contributing to these limited effects may be the overdispersion of shrub stems at fine spatial scales, preventing areas of deep shade. When we looked across a shrub density gradient and incorporated shrub architecture into our analyses, we found these shrub traits had significant associations with species abundance and root biomass in the understory community. These results suggest that stem dispersion patterns, as well as local stand architecture, are influential in determining how shrubs may affect their herbaceous plant understory. Thus, it is important to incorporate shrub spatial and architectural traits when assessing shrub-understory interactions.
机译：生态系统在植物群落组成和功能中是空间异常的。草原的灌木发生是一个视觉上引人注目的例子，已经进行了许多研究以了解这种模式的功能含义。在大草原生态系统中，树木和灌木上的存在可能对床骨群落有重大影响。然而，确切的结果可能是空间排列和卵利物种的特征的函数。在这里，我们测试了天然灌木的空间图案中的空间图案，常设生物量，群落组成以及加拿大阿尔伯塔亚洲阿斯彭·兰德的邻近草原林藏社区的整体养分循环之间存在功能联系。在成对的草原灌木支架研究中，我们发现原生灌木，elaeagnus通货数据，对生态系统的组成和常设生物量相对较少的待机影响。有助于这些有限效果的一个因素可以是灌木茎的过度分散在细小的空间尺度下，防止深层阴影区域。当我们在灌木密度梯度并将灌木架构结合到我们的分析中时，我们发现这些灌木特征在林下社区中具有与物种丰富和根生物量的重要组织。这些结果表明，茎分散模式以及局部立场结构在确定灌木如何影响其草本植物的植物中有影响力。因此，在评估灌木较长的相互作用时掺入灌木空间和建筑性状是重要的。

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