Root traits and soil legacies drive species competition outcomes

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-08-08 DOI:10.1111/1365-2435.14631

Xilatu Dabu, Hui Ji, Liang Yang, T. Martijn Bezemer, Jingying Jing

引用次数: 0

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根系特征和土壤遗留物驱动物种竞争结果

植物竞争不仅会受到植物功能特性的影响，还会受到土壤微生物介导的适应性差异的影响。干旱等气候条件会进一步影响植物竞争。然而，人们对土壤微生物和干旱如何与具有不同根系特征的植物物种相互作用以及如何影响植物竞争结果知之甚少。我们在中国温带草原上种植了三种共生植物（Stipa krylovii、Artemisia frigida、Agropyron cristatum），将其单株或混种，并将植物组合置于五种土壤接种体（S. krylovii、A. frigida、A. cristatum 的根相关土壤、三种根区土壤的等量混合物和灭菌土壤）以及干旱处理中。这三个物种在竞争能力上表现出明显的差异，A. cristatum > S. krylovii > A. frigida，土壤接种剂或干旱处理并没有改变顺序。植株的相对产量（RY）受土壤接种物、干旱和植株排列的影响。最强的竞争者 A. cristatum 具有较高的根系总长度、根系表面积和根系体积，经历了更多的生物负反馈，而干旱加剧了这些负效应的程度。相反，最弱的竞争者 A. frigida 具有较高的比根长度，往往具有中性或积极的生物反馈，而干旱则没有影响。此外，三个物种的 RY 和适应性差异（反映为混合物中的竞争能力）受根系性状和植物-土壤反馈的影响不同。A.cristatum的RY可以通过混合物中的反馈效应预测，而适应性差异主要与根系性状有关。A. frigida（最弱的竞争者）的有效年限和适应性差异都可以通过根系性状差异和反馈效应预测。我们的研究表明，共存物种的竞争结果取决于根系性状和混合物中特定物种的 PSF 效应。未来的工作应该研究植物竞争和土壤微生物异质性如何与气候变化共同影响植物共存的机制。

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来源期刊

Functional Ecology 环境科学-生态学

CiteScore

9.00

自引率

1.90%

发文量

243

审稿时长

4 months

期刊介绍： Functional Ecology publishes high-impact papers that enable a mechanistic understanding of ecological pattern and process from the organismic to the ecosystem scale. Because of the multifaceted nature of this challenge, papers can be based on a wide range of approaches. Thus, manuscripts may vary from physiological, genetics, life-history, and behavioural perspectives for organismal studies to community and biogeochemical studies when the goal is to understand ecosystem and larger scale ecological phenomena. We believe that the diverse nature of our journal is a strength, not a weakness, and we are open-minded about the variety of data, research approaches and types of studies that we publish. Certain key areas will continue to be emphasized: studies that integrate genomics with ecology, studies that examine how key aspects of physiology (e.g., stress) impact the ecology of animals and plants, or vice versa, and how evolution shapes interactions among function and ecological traits. Ecology has increasingly moved towards the realization that organismal traits and activities are vital for understanding community dynamics and ecosystem processes, particularly in response to the rapid global changes occurring in earth’s environment, and Functional Ecology aims to publish such integrative papers.