Variation in resource acquisition and utilization traits between native and invasive perennial forbs
Variation in resource acquisition and utilization traits between native and invasive perennial forbs
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DOI：
10.3732/ajb.2007408
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发表时间：
2008-06-01
影响因子：
3
通讯作者：
James, Jeremy J.
中科院分区：
文献类型：
--
作者：
Drenovsky, Rebecca E.;Martin, Christina E.;James, Jeremy J.
了解入侵者超越本地入侵者的功能特征是提高我们预测和管理入侵者传播能力的必要的第一步。在营养有限的系统中，植物的竞争能力预计与植物利用营养丰富的微位点并有效利用这些捕获的营养的能力密切相关。这项工作的主要目标是比较本地和入侵的多年生杂草从营养丰富的微场所获取和利用营养的能力。我们评估了暴露于异质（斑块）或均质（对照）养分分布的四种本地物种和四种入侵物种的形态和生理反应。平均而言，与本地物种相比，入侵物种将更多的生物量分配给根部，并将更多的根部长度分配给营养丰富的微场所。无论进行何种处理，入侵植物的叶片氮、光合速率和光合氮利用效率都高于本地植物。虽然这些结果表明多种性状可能有助于入侵性杂草在低营养环境中的成功，但我们也观察到本地杂草的这些性状存在很大差异。这些观察结果支持这样的观点，即植物群落中的功能性状变异可能比植物群落的功能群组成更好地预测入侵抵抗力。
Understanding the functional traits that allow invasives to outperform natives is a necessary first step in improving our ability to predict and manage the spread of invaders. In nutrient-limited systems, plant competitive ability is expected to be closely tied to the ability of a plant to exploit nutrient-rich microsites and use these captured nutrients efficiently. The broad objective of this work was to compare the ability of native and invasive perennial forbs to acquire and use nutrients from nutrient-rich microsites. We evaluated morphological and physiological responses among four native and four invasive species exposed to heterogeneous (patch) or homogeneous (control) nutrient distribution. Invasives, on average, allocated more biomass to roots and allocated proportionately more root length to nutrient-rich microsites than did natives. Invasives also had higher leaf N, photosynthetic rates, and photosynthetic nitrogen use efficiency than natives, regardless of treatment. While these results suggest multiple traits may contribute to the success of invasive forbs in low-nutrient environments, we also observed large variation in these traits among native forbs. These observations support the idea that functional trait variation in the plant community may be a better predictor of invasion resistance than the functional group composition of the plant community.