Negative plant-soil feedback and species coexistence
Negative plant-soil feedback and species coexistence
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DOI：
10.1111/j.0030-1299.2005.13975.x
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发表时间：
2005-11-01
期刊：
影响因子：
3.4
通讯作者：
Mazzoleni, S
中科院分区：
文献类型：
--
作者：
Bonanomi, G;Giannino, F;Mazzoleni, S
不同的机制，包括平衡和非平衡过程，已被视为可能的理论解释物种共存。尽管有充分的证据表明，在农业和自然植被中存在着植物-土壤负反馈，但这些过程在植物群落的组织和动态中的作用迄今为止一直被忽视。在这项研究中，模拟基于个人的竞争模型显示了如何对个体植物性能的负反馈的强度可以产生更快的演替动态，并允许物种共存的两个和多个物种的系统。结果表明，即使是低水平的植物-土壤负反馈也能使物种共存，并经常产生循环的种群动态。此外，该模型强调了负反馈如何在种群水平上产生正的互惠种间相互作用，尽管事实上，只有竞争性的相互作用存在于个体植物之间。事实上，竞争效应发生在一个短期的规模，但积极的互惠物种的相互作用出现只有当负反馈影响所有物种，如果更长的时间的模拟，超过物种的寿命，被认为是。该模型的一个重要成果是证据表明，在人口水平上的影响是时间尺度依赖的，从而显示了在传统的竞争研究中使用的短期物种去除实验的局限性。
Different mechanisms, including equilibrium and non-equilibrium processes, have been taken into account as possible theoretical explanations of species coexistence. Despite the ample evidence on the existence of negative plant-soil feedback in both agriculture and natural vegetation, the role of these processes in the organization and dynamics of plant communities has so far been neglected. In this study, simulations by an individual-based competition model show how the intensity of negative feedback on individual plant performance can produce faster successional dynamics and allow species coexistence in two- and multi-species systems. The results show that even low levels of negative plant-soil feedback can enable species coexistence and often produce cyclic population dynamics. Moreover, the model highlights how negative feedback can generate positive reciprocal interspecific interactions at the population level, despite the fact that only competitive interactions is present between individual plants. In fact, competitive effects occur on a short-term scale, but positive reciprocal species interactions emerge only if negative feedback affects all species and if longer periods of simulation, more than the species life span, are considered. An important outcome of the model is the evidence that the effects at population level are timescale-dependent, thus showing the limitation of short-term species removal experiments used in traditional competition studies.