TRAIT CONVERGENCE AND PLASTICITY AMONG NATIVE AND INVASIVE SPECIES IN RESOURCE-POOR ENVIRONMENTS
TRAIT CONVERGENCE AND PLASTICITY AMONG NATIVE AND INVASIVE SPECIES IN RESOURCE-POOR ENVIRONMENTS
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DOI：
10.3732/ajb.1100417
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发表时间：
2012-04-01
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.;Khasanova, Albina;James, Jeremy J.
研究前提：功能特征比较提供了一个评估侵袭性和侵袭性的框架。然而，最近的研究发现，共存的优势原生物种和入侵物种之间既有特征趋同，也有特征差异。很少有研究评估多重胁迫如何限制性状的价值和可塑性，也没有研究包括直接测量营养保存性状，这对植物在低资源环境中的生长至关重要。方法：我们评估了营养和水分胁迫如何影响生长和分配，水势和气体交换，以及氮(N)分配和利用性状，以确定性状价值和可塑性。在温室里，我们在高氮、低氮和水可获得性的全面因素组合下生长我们的物种。我们测量了相对生长率(RGR)及其组成、总生物量、生物量分配、中午水势、光合作用速率、水分利用效率(WUE)、绿叶N、衰老叶N、全N库、N生产力和光合N利用效率。干旱降低了植物生物量和相对生长率，限制了氮素的保存，导致水分利用效率增加。对于大多数性状，本地和外来物种的可塑性相似。结论：我们的数据表明，本地和入侵的生物量优势种可能在功能相似的性状上趋同，并表现出对资源可获得性变化的类似反应能力。
Premise of study: Functional trait comparisons provide a framework with which to assess invasion and invasion resistance. However, recent studies have found evidence for both trait convergence and divergence among coexisting dominant native and invasive species. Few studies have assessed how multiple stresses constrain trait values and plasticity, and no study has included direct measurements of nutrient conservation traits, which are critical to plants growing in low-resource environments.Methods: We evaluated how nutrient and water stresses affect growth and allocation, water potential and gas exchange, and nitrogen (N) allocation and use traits among a suite of six codominant species from the Intermountain West to determine trait values and plasticity. In the greenhouse, we grew our species under a full factorial combination of high and low N and water availability. We measured relative growth rate (RGR) and its components, total biomass, biomass allocation, midday water potential, photosynthetic rate, water-use efficiency (WUE), green leaf N, senesced leaf N, total N pools, N productivity, and photosynthetic N use efficiency.Key results: Overall, soil water availability constrained plant responses to N availability and was the major driver of plant trait variation in our analysis. Drought decreased plant biomass and RGR, limited N conservation, and led to increased WUE. For most traits, native and nonnative species were similarly plastic.Conclusions: Our data suggest native and invasive biomass dominants may converge on functionally similar traits and demonstrate comparable ability to respond to changes in resource availability.