Drought legacies mediated by trait trade‐offs in soil microbiomes
Drought legacies mediated by trait trade‐offs in soil microbiomes
复制标题
土壤微生物组性状权衡介导的干旱遗产
DOI：
10.1002/ecs2.3562
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发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
S. Allison
中科院分区：
文献类型：
--
作者：
Bin Wang;S. Allison
土壤微生物组在驱动地球系统的生物地球化学循环中发挥着关键作用。随着气候变化导致干旱频率和强度增加，土壤微生物及其控制的过程将受到影响。即使干旱结束后，微生物组和其他系统也需要时间来恢复，并可能显示出对之前气候条件的记忆。尽管如此，这些遗留影响所涉及的机制仍不清楚，因此很难预测未来的气候和生物地球化学速率。在这里，我们使用基于性状的微生物组模型（Dementpy）来实施权衡介导的机制，该机制可能导致干旱对凋落物分解的遗留影响。假设权衡遵循 Y-A-S 框架，该框架定义了微生物的三种主要生活史策略：高生长产量、资源获取和胁迫耐受性。我们代表了耐旱所需的渗透剂和参与凋落物分解的酶的投资之间的细胞权衡。模拟是在不同程度的干旱严重程度和扩散程度下进行的。由于扩散程度较高，DMENTpy 预测干旱后不会产生遗留影响。由于传播有限，严重干旱导致群落层面性状改变和凋落物分解减少的持久遗留问题。中度干旱造成了短暂的影响，并在两年后消失，这与最近对南加州生态系统的实证观察结果一致。这些结果意味着，酶投资和渗透剂生产之间的权衡变化更大，会导致更强的遗留效应。更一般地说，改变 YAS 空间中微生物组位置的因素可能会改变干旱后的遗留结果。我们基于性状的建模研究激发了额外的经验测量来量化 YAS 性状和权衡，从而准确预测土壤微生物组的恢复力和功能。此外，我们的研究还说明了一种新兴方法，用于表示微生物组和植被的性状权衡，这些权衡决定了生态系统对干旱和其他环境扰动的反应。
Soil microbiomes play a key role in driving biogeochemical cycles of the Earth system. As drought frequency and intensity increase due to climate change, soil microbes and the processes they control will be impacted. Even after a drought ends, microbiomes and other systems take time to recover and may display a memory of previous climate conditions. Still, the mechanisms involved in these legacy effects remain unclear, making it difficult to predict climate and biogeochemical rates in the future. Here, we used a trait-based microbiome model (DEMENTpy) to implement trade-off-mediated mechanisms that may lead to drought legacy effects on litter decomposition. Trade-offs were assumed to follow the Y-A-S framework that defines three primary life-history strategies of microorganisms: high growth Yield, resource Acquisition, and Stress tolerance. We represented cellular trade-offs between osmolytes required for drought tolerance and investment in enzymes involved in litter decomposition. Simulations were run under varying levels of drought severity and dispersal. With high levels of dispersal, no legacy effects were predicted by DEMENTpy following drought. With limited dispersal, severe drought resulted in a persistent legacy of altered community-level traits and reduced litter decomposition. Moderate drought resulted in a transient legacy that disappeared after two years, consistent with recent empirical observations in Southern California ecosystems. These results imply that greater movement along the trade-off between enzyme investment and osmolyte production resulted in stronger legacy effects. More generally, factors that shift the position of a microbiome in YAS space may alter the legacy outcome following drought. Our trait-based modeling study motivates additional empirical measurements to quantify YAS traits and trade-offs that are needed to make accurate predictions of soil microbiome resilience and functioning. Also, our study illustrates an emerging approach for representing trait trade-offs in microbiomes and vegetation that dictate ecosystem responses to drought and other environmental perturbations.
影响因子：
11
作者：
Malik, Ashish A.;Martiny, Jennifer B. H.;Allison, Steven D.
通讯作者：
Allison, Steven D.