Resilience: nitrogen limitation, mycorrhiza and long-term palaeoecological plant-nutrient dynamics
Resilience: nitrogen limitation, mycorrhiza and long-term palaeoecological plant-nutrient dynamics
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DOI：
10.1098/rsbl.2019.0441
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发表时间：
2020-01-29
期刊：
影响因子：
3.3
通讯作者：
Jeffers, Elizabeth S.
中科院分区：
文献类型：
--
作者：
Bonsall, Michael B.;Froyd, Cynthia A.;Jeffers, Elizabeth S.
生态系统动态是由生物和非生物过程驱动的，扰动可以将生态系统推入新的动态状态。植物与植物、植物与土壤以及菌根的关联都会影响植物生态系统的动态；然而，这些影响的方向和程度因环境而异，而且它们对生态系统长期恢复能力的贡献仍然未知。在这里，我们使用数学框架研究植物反馈和菌根对植物与养分相互作用的影响。我们证明了强烈的营养控制反馈、菌根的调节以及对生态恢复力的影响。我们使用该模型来研究纵向古生态桦树-三角洲 N-15 相互作用对植物-土壤反馈和菌根关联的恢复力。 Birch-Delta N-15 系统表现出高水平的弹性。据预测，菌根可以通过支持植物氮的吸收和固定多余的氮来提高恢复力；相反，植物-土壤反馈导致有效氮的长期富集预计会降低生态恢复力。
Ecosystem dynamics are driven by both biotic and abiotic processes, and perturbations can push ecosystems into novel dynamical regimes. Plant-plant, plant-soil and mycorrhizal associations all affect plant ecosystem dynamics; however, the direction and magnitude of these effects vary by context and their contribution to ecosystem resilience over long time periods remains unknown. Here, using a mathematical framework, we investigate the effects of plant feedbacks and mycorrhiza on plant-nutrient interactions. We show evidence for strong nutrient controlled feedbacks, moderation by mycorrhiza and influence on ecological resilience. We use this model to investigate the resilience of a longitudinal palaeoecological birch-delta N-15 interaction to plant-soil feedbacks and mycorrhizal associations. The birch-delta N-15 system demonstrated high levels of resilience. Mycorrhiza were predicted to increase resilience by supporting plant-nitrogen uptake and immobilizing excess nitrogen; in contrast, long-term enrichment in available nitrogen by plant-soil feedbacks is expected to decrease ecological resilience.