Nitrogen niche partitioning between tropical legumes and grasses conditionally weakens under elevated CO2

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY

Functional Ecology Pub Date : 2024-05-31 DOI:10.1111/1365-2435.14595

Amber C. Churchill, Haiyang Zhang, Gil Won Kim, Karen L. M. Catunda, Ian C. Anderson, Forest Isbell, Ben Moore, Elise Pendall, Jonathan M. Plett, Jeff R. Powell, Sally A. Power

引用次数: 0

Abstract

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在二氧化碳升高条件下，热带豆科植物和禾本科植物之间的氮生态位分配会有条件性减弱

植物群落的生物多样性至少可以部分地通过随着环境条件的变化，物种在资源的促进和竞争之间相互作用的变化来维持。这些相互作用还能推动生态系统功能（包括生产力）的发挥，并能促进超产--这是农业生态系统（如牧场）优先考虑的一种生态系统服务。重要的是，可导致超产的物种相互作用可能会随着二氧化碳浓度的升高和资源可用性的变化而改变，而这些变化对产量的影响尚不确定，尤其是在热带混交种草地上。我们研究了热带牧草和豆科植物在二氧化碳温室实验中单种和混种生长的相对表现。我们利用稳定同位素来区分土壤氮和生物氮固定（BNF）在这两种混合物的氮获取转化为地上生物量过程中的作用，从而研究了氮（N）生态位分配和生物促进如何导致超产。我们发现，在混合物中，物种对土壤氮的利用与生物固氮的利用之间的氮生态位分区推动了物种间的相互作用。重要的是，在二氧化碳升高的条件下，分区和超产现象普遍减少。然而，根据混合物中优势物种的生物量和优势物种选择效应的强度，这一发现与混合物有关。这项研究表明，大气中二氧化碳的升高可能会改变共生物种之间的生态位分配，从而对豆科-禾本科混合物在有热带物种的工作景观中的超产效益产生负面影响。此外，物种间相互作用的这些变化可能会对草地组成产生影响，而这些影响尚未在气候变化和物种分布影响的更大规模预测中得到考虑。在期刊博客上免费阅读本文的通俗摘要。

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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.