Differential root nutrient-acquisition strategies underlie biogeochemical niche separation between grasses and forbs across grassland biomes

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-08-02 DOI:10.1111/1365-2435.14629

Na Zhou, Haigang Li, Baolan Wang, Zed Rengel, Hongbo Li

引用次数: 0

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草地生物群落中禾本科植物和草本植物之间生物地球化学生态位分离的根源在于不同的根系养分获取策略

植物营养成分是确定植物生态策略和生态位分化的可靠工具。在此，我们旨在（i）揭示共存草原物种之间不同叶片养分组成的潜在生理机制；（ii）阐明分类和环境条件在这些组成中的作用。在地方（草原）尺度上，我们测量了18个共存物种的根系形态和生理特征、光合参数以及叶片中六种宏量营养元素（氮、磷、硒、钾、钙和镁）和四种微量营养元素（铁、锰、锌和铜）的浓度。在区域尺度上，我们测量了内蒙古温带草甸、典型草地、荒漠草地和盐碱草地中76个草地物种组合的叶面宏量和微量营养元素浓度。在全国范围内，我们收集了中国新疆、青藏和内蒙古草原上 513 个地点-物种组合的叶面宏量营养素浓度数据。与牧草相比，禾本科植物的根分枝强度高出3.9倍，但根羧酸盐渗出量和叶片蒸腾速率却分别低58%和48%。这些不同的养分获取和运输策略导致禾本科植物叶片养分（氮、磷、钙、镁和锰）浓度在局部范围内低于牧草。在区域尺度上，禾本科植物和牧草的叶片微量营养元素浓度大多没有差异，而在区域和国家尺度上，无论草原类型如何，牧草的宏量营养元素浓度都高于禾本科植物。与微量营养元素相比，所有宏量营养元素的浓度都表现出更强的系统发育保守性和更小的环境控制性。同域禾本科植物和草本植物之间的生物地球化学生态位隔离（基于叶片宏量营养元素浓度的 PCA 分数的欧氏距离）在草甸草原低于典型草原、荒漠草原和盐碱草原。我们的研究结果表明，不同的养分获取和运输策略可能是禾本科植物和草本植物叶片养分组成不同的原因。禾本科植物和草本植物的潜在生理机制与生物地球化学生态位差异之间的联系将促进我们对植物物种共存和适应策略的理解。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.