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Endangered plants persist under phosphorus limitation

机译：濒临灭绝的植物在磷限制下持续存在

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摘要

Nitrogen enrichment is widely thought to be responsible for the loss of plant species from temperate terrestrial ecosystems. This view is based on field surveys and controlled experiments showing that species richness correlates negatively with high productivity(1,2) and nitrogen enrichment(3). However, as the type of nutrient limitation has never been examined on a large geographical scale the causality of these relationships is uncertain. We investigated species richness in herbaceous terrestrial ecosystems, sampled along a transect through temperate Eurasia that represented a gradient of declining levels of atmospheric nitrogen deposition - from similar to 50 kg ha(-1) yr(-1) in western Europe to natural background values of less than 5 kg ha(-1) yr(-1) in Siberia(4). Here we show that many more endangered plant species persist under phosphorus- limited than under nitrogen- limited conditions, and we conclude that enhanced phosphorus is more likely to be the cause of species loss than nitrogen enrichment. Our results highlight the need for a better understanding of the mechanisms of phosphorus enrichment, and for a stronger focus on conservation management to reduce phosphorus availability.
机译：人们普遍认为，富氮是造成温带陆地生态系统损失植物物种的原因。该观点基于实地调查和受控实验，表明物种丰富度与高生产率（1,2）和氮富集（3）呈负相关。但是，由于从未在较大的地理范围内研究过营养限制的类型，因此这些关系的因果关系尚不确定。我们调查了沿陆地温带欧亚大陆样带采样的陆地生态系统中物种的丰富度，该样带代表了大气氮沉积水平下降的梯度-从西欧的50 kg ha（-1）yr（-1）到自然背景值在西伯利亚（4）小于5 kg ha（-1）yr（-1）。在这里，我们表明，在磷受限的情况下比在氮受限的条件下存在更多的濒临灭绝的植物物种，并且我们得出结论，磷的增加比氮富集更可能是物种丧失的原因。我们的结果表明，需要更好地了解磷富集的机制，并且需要更加注重保护管理以减少磷的可利用性。

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