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Mycorrhiza in tree diversity–ecosystem function relationships: conceptual framework and experimental implementation

机译:树木多样性与生态系统功能关系中的菌根:概念框架和实验实施

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摘要

The widely observed positive relationship between plant diversity and ecosystem functioning is thought to be substantially driven by complementary resource use of plant species. Recent work suggests that biotic interactions among plants and between plants and soil organisms drive key aspects of resource use complementarity. Here, we provide a conceptual framework for integrating positive biotic interactions across guilds of organisms, more specifically between plants and mycorrhizal types, to explain resource use complementarity in plants and its consequences for plant competition. Our overarching hypothesis is that ecosystem functioning increases when more plant species associate with functionally dissimilar mycorrhizal fungi because differing mycorrhizal types will increase coverage of habitat space for and reduce competition among plants. We introduce a recently established field experiment (MyDiv) that uses different pools of tree species that associate with either arbuscular or ectomycorrhizal fungi to create orthogonal experimental gradients in tree species richness and mycorrhizal associations and present initial results. Finally, we discuss options for future mechanistic studies on resource use complementarity within MyDiv. We show how mycorrhizal types and biotic interactions in MyDiv can be used in the future to test novel questions regarding the mechanisms underlying biodiversity–ecosystem function relationships.
机译:人们普遍认为,植物多样性与生态系统功能之间的积极关系主要是由对植物物种的补充资源利用所驱动。最近的工作表明,植物之间以及植物与土壤生物之间的生物相互作用推动了资源利用互补性的关键方面。在这里,我们提供了一个概念框架,用于整合跨行业协会(尤其是植物与菌根类型之间)的积极生物相互作用,以解释植物资源利用的互补性及其对植物竞争的影响。我们的总体假设是,当更多植物物种与功能不同的菌根真菌相关联时,生态系统功能会增强,因为不同的菌根类型将增加植物的栖息地覆盖范围并减少植物之间的竞争。我们介绍了最近建立的现场实验(MyDiv),该实验使用与树丛真菌或外生菌根真菌相关联的不同树种库,以在树种丰富度和菌根协会中创建正交实验梯度,并提供初步结果。最后,我们讨论了MyDiv中有关资源使用互补性的未来机制研究的方案。我们展示了MyDiv中的菌根类型和生物相互作用如何在将来用于测试有关生物多样性与生态系统功能关系的潜在机制的新问题。

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