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The effects of long-term fertilization on the temporal stability of alpine meadow communities.

机译：长期施肥对高寒草甸群落时间稳定性的影响。

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摘要

Recent theoretical and experimental work suggests that species diversity enhances the temporal stability of communities. However, empirical support largely comes from experimental communities. The relationship between diversity and stability in natural communities, and the ones facing environmental changes in particular, has received less attention. We created a gradient of fertility in a natural alpine meadow community to test the effects of diversity and fertilization on the temporal variability of community cover and cover of component species and to determine the importance of asynchrony, portfolio effects, cover and dominance for diversity-stability relationships. Although fertilization strongly reduced species richness, the temporal stability in community cover increased with fertilization. Most species showed a decline of temporal stability in mean population cover with fertilization, but two grass species, which dominated fertilized communities after 10 years, showed an increase of stability. Detailed analysis revealed that the increased dominance of these two highly stable grass species was associated with increased community stability at high levels of fertilization. In contrast, we found little support for other mechanisms that have been proposed to contribute to community stability, such as changes in asynchrony and portfolio effects. We conclude that the presence of highly productive species that have stabilizing properties dominate fertilized assemblages and enhance ecosystem stability.Digital Object Identifier http://dx.doi.org/10.1007/s11104-011-0784-0
机译：最近的理论和实验工作表明，物种多样性增强了社区的时间稳定性。但是，经验支持主要来自实验社区。自然社区，特别是面临环境变化的多样性与稳定性之间的关系，受到的关注较少。我们在天然高山草甸社区中建立了一个肥力梯度，以测试多样性和施肥对社区覆盖物和组成物种覆盖物时间变化的影响，并确定异步，投资组合效应，覆盖物和优势对于多样性稳定性的重要性关系。尽管施肥极大地降低了物种丰富度，但随着施肥的增加，群落覆盖的时间稳定性也增加了。大多数物种在施肥后的平均种群覆盖率上都显示出时间稳定性的下降，但10年后在受精群落中占主导地位的两种草种却表现出稳定性的提高。详细的分析表明，这两种高度稳定的草种的优势地位增加与高水平施肥下的群落稳定性增加有关。相比之下，我们发现对提议的有助于社区稳定的其他机制（例如异步变化和投资组合效应）的支持很少。我们得出的结论是，具有稳定特性的高产物种的存在主导了受精组合并增强了生态系统的稳定性。数字对象标识符http://dx.doi.org/10.1007/s11104-011-0784-0

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