Soil fungi lead to stronger ‘diminishing returns’ in fine-root length versus mass allometry towards earlier successional tropical forests

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-09-11 DOI:10.1111/1365-2435.14654

Zijian Guo, Wenhao Miao, Yueming Lyu, Xiangping Wang

引用次数: 0

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土壤真菌导致细根长度与质量异构的 "收益递减 "效应增强，使热带雨林的演替更早

随着叶片质量投入的增加，资源获取能力的收益会逐渐降低，这就是所谓的 "收益递减"，它为植物经济提供了重要的启示。然而，细根是否也存在这种情况，以及根系获取资源的策略如何随着森林演替而变化，目前仍不清楚。我们研究了中国西南部西双版纳热带雨林四个演替阶段 24 个地块 215 个表土核心的细根长度（L）和质量（M）之间的比例关系。我们还利用层次变异分配法评估了土壤条件、叶片功能特征、树种多样性和土壤真菌因素对长度与质量比例关系的相对影响。我们的研究结果表明，根系长度的收益递减（L vs. M比例指数<1）在晚演替森林中高于早演替森林，这与晚演替阶段的 "自己动手 "策略转变为早演替阶段土壤真菌的 "外包 "资源吸收策略相对应。土壤真菌丰度是各地块L与M比例指数变化的主要驱动因素（解释了58%的变异），其中根内生真菌是最强的预测因子（22.11%），其次是菌根真菌（10.41%），而其他因子（叶片功能特征、土壤养分条件和树种多样性）的影响较弱。我们的研究结果表明，根内生真菌和菌根真菌是森林演替过程中根系经济变化的关键调节因子，但前者以前较少受到关注。与常用的比根长度相比，L 与 M 的比例指数可能是根系资源获取策略变化的更好指标。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.