Dawson Wayne, Rohr Rudolf P, van Kleunen Mark, Fischer Markus
Institute for Plant Sciences, University of Bern, Altenbergrain 21, Bern 3013, Switzerland.
Ecology, Department of Biology, University of Konstanz, Universitätsstrasse 10, D 78464 Konstanz, Germany.
New Phytol. 2012 May;194(3):859-867. doi: 10.1111/j.1469-8137.2012.04104.x. Epub 2012 Mar 12.
• A high ability of alien plant species to capitalize on increases in resource availability has been suggested as an explanation for being globally successful. Here, we tested this hypothesis meta-analytically using existing data from experiments manipulating plant resources (light, water and nutrients). • From these studies we extracted the response to resource increase of biomass, as an indicator of plant performance, and the responses of two traits related to resource capture: root : shoot ratio and specific leaf area (SLA). For 211 species recorded in the Global Compendium of Weeds, we assessed the relationship between effect sizes from such studies and the number of global regions where a species was established. • We found that globally widespread species exhibited greater biomass responses to increases in resources overall, compared to less widespread species. Root : shoot ratio and SLA responses to increased resource availability were not related to species global distribution. • In general, globally widespread alien plant species were better able to capitalize on increased availability of resources, through achieving increased growth and biomass accumulation, while greater plasticity of key resource-capture traits per se did not appear to be related to greater success.
• 外来植物物种利用资源可利用性增加的能力较强，这被认为是其在全球取得成功的一个原因。在此，我们使用来自操纵植物资源（光照、水分和养分）实验的现有数据，通过荟萃分析来检验这一假设。
• 我们从这些研究中提取了生物量对资源增加的响应，作为植物表现的一个指标，以及与资源获取相关的两个性状的响应：根冠比和比叶面积（SLA）。对于《全球杂草名录》中记录的211个物种，我们评估了此类研究的效应大小与一个物种已建立的全球区域数量之间的关系。
• 我们发现，与分布范围较窄的物种相比，全球分布广泛的物种总体上对资源增加表现出更大的生物量响应。根冠比和SLA对资源可利用性增加的响应与物种的全球分布无关。
• 一般来说，全球分布广泛的外来植物物种能够更好地利用资源可利用性的增加，实现生长增加和生物量积累，而关键资源获取性状本身更大的可塑性似乎与更大的成功无关。
