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首页> 美国卫生研究院文献>other >Competition between a Lawn-Forming Cynodon dactylon and a Tufted Grass Species Hyparrhenia hirta on a South-African Dystrophic Savanna
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Competition between a Lawn-Forming Cynodon dactylon and a Tufted Grass Species Hyparrhenia hirta on a South-African Dystrophic Savanna

机译：在南非营养不良的热带稀树草原上形成草坪的犬齿类人种与簇状草种Hyparrhenia hirta之间的竞争

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South African savanna grasslands are often characterised by indigestible tufted grass species whereas lawn grasses are far more desirable in terms of herbivore sustenance. We aimed to investigate the role of nutrients and/or the disturbance (grazing, trampling) by herbivores on the formation of grazing lawns. We conducted a series of common garden experiments to test the effect of nutrients on interspecific competition between a typical lawn-forming grass species (Cynodon dactylon) and a species that is frequently found outside grazing lawns (Hyparrhenia hirta), and tested for the effect of herbivore disturbance in the form of trampling and clipping. We also performed a vegetation and herbivore survey to apply experimentally derived insights to field observations. Our results showed that interspecific competition was not affected by soil nutrient concentrations. C. dactylon did show much more resilience to disturbance than H. hirta, presumably due to the regenerative capacity of its rhizomes. Results from the field survey were in line with these findings, describing a correlation between herbivore pressure and C. dactylon abundance. We conclude that herbivore disturbance, and not soil nutrients, provide C. dactylon with a competitive advantage over H. hirta, due to vegetative regeneration from its rhizomes. This provides evidence for the importance of concentrated, high herbivore densities for the creation and maintenance of grazing lawns.
机译：南非大草原草原的特征通常是难以消化的簇生草种，而就草食动物的寄养而言，草坪草更为可取。我们旨在调查养分和/或食草动物对放牧草坪形成的干扰（放牧，践踏）的作用。我们进行了一系列常见的花园实验，以测试养分对典型的形成草坪的草种（Cynodon dactylon）和经常在放牧草坪之外发现的草种（Hyparrhenia hirta）之间种间竞争的影响，并测试了以践踏和修剪为形式的草食动物干扰。我们还进行了植被和草食动物调查，将通过实验得出的见解应用于野外观察。我们的结果表明，种间竞争不受土壤养分浓度的影响。假单胞菌确实显示出比杂种更强的抗干扰能力，这可能是由于其根茎的再生能力所致。实地调查的结果与这些发现相吻合，描述了草食动物压力与羊齿线虫丰度之间的相关性。我们得出的结论是，由于根茎的营养再生，草食动物的干扰而不是土壤养分为provide草提供了比H草的竞争优势。这提供了集中的高草食动物密度对于创建和维持放牧草坪的重要性的证据。

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