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Interaction between light availability and grazing enhances species richness and turnover of vascular plants in shrubby pastures in Romania

机译:光可用性与放牧之间的相互作用提高了罗马尼亚灌木牧场的物种丰富性和血管植物的营业额

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摘要

Shrubs in pastures are expected to adversely affect plant species diversity and community composition at various spatial scales. We recorded vegetation composition as well as light conditions and other environmental variables in 105 1 m(2) plots nested in 35 sampling sites in shrubby pastures in Romanian Banat. We used generalized linear models, generalized linear mixed-effects models, and linear regression to find determinants of species turnover and richness at patch and community level. We expected shrubs to negatively influence species richness on the patch level but to introduce spatial heterogeneity to the light availability resulting in a unimodal relationship of light availability with species richness on the community level. Species turnover was significantly influenced by light conditions, grazing variability, and distance between the plots. We found a unimodal relationship between light availability and species richness consistently across the two spatial scales in grazed sites. However, the same relationship changed its shape from linear to unimodal in non-grazed sites. Shrubs in pastures may not be considered as a threat to plant species diversity. Instead, they contribute significantly to plant species diversity and vegetation heterogeneity.
机译:预计牧场的灌木将在各种空间尺度下对植物物种多样性和群落组成产生不利影响。我们录制了植被组成以及在罗马尼牧场的35个采样点嵌套在巢穴中的105米(2)块地块中的灯光条件和其他环境变量。我们使用了广义线性模型,广义线性混合效应模型,以及线性回归,以查找物种营业额和补丁和社区水平的丰富度的决定因素。我们预计灌木在贴片水平上对物种的丰富性产生负面影响,而是为了引入空间异质性,导致光可用性与社区水平的物种丰富性的光可用性术语不一样的关系。物种营业额因轻度条件,放牧可变性和地块之间的距离而受到显着影响。我们在光可用性和物种之间的态度之间找到了一个单峰关系,始终如一地横跨放牧地点的两个空间鳞片。然而,相同的关系将其形状从线性到非格拉内特地点的单峰变化。牧场的灌木可能不被视为对植物物种多样性的威胁。相反,它们对植物物种多样性和植被异质性有贡献。

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