植被阶段和土壤层分别决定了树线对比土壤中根瘤效应的方向和大小

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY Functional Ecology Pub Date : 2024-08-06 DOI:10.1111/1365-2435.14625

Jennifer Michel, Sébastien Fontaine, Sandrine Revaillot, Catherine Piccon-Cochard, Jeanette Whitaker

引用次数: 0

摘要

高纬度和高海拔地区的树线被认为是全球变化的哨兵。这表现为乔木和灌木的加速侵占以及植物生产力的提高，目前尚不清楚这对这些生物群落碳平衡的影响。鉴于许多树线土壤中存在大量的土壤有机碳储量，我们在此想知道，引入高产植物是否会通过根瘤效应加速碳循环，以及某些土壤是否会比其他土壤更容易受到正向引力的碳损失。为了验证这一点，我们在瑞典亚北极地区和秘鲁安第斯山脉的树线上下采集了有机土壤和矿物质土壤样本。然后进行了一项温室实验，利用自然丰度标记和 C4 种植物 Cynodon dactylon 来量化植物诱导的土壤矿化率变化（根瘤效应）和新碳形成。实验期间监测了一些环境、植物、土壤和微生物参数，以补充对土壤碳循环的观察。在实验开始时，引诱作用主要为正，然后在植物生长季节，所有土壤中的引诱作用系统性地减弱，到植物衰老期实验结束时，引诱作用主要为负。与引力的方向无关，有机土壤的引力总是大于相应的矿质土壤，而矿质土壤的 C 含量较高最能说明这一点。综合整个研究期间的情况来看，引肥（正向和负向）对土壤碳平衡的总体影响大多可以忽略不计。尽管在瑞典亚北极苔原的有机土壤中观察到了土壤碳的净损失。最值得注意的是，根据取样时间的不同，正负引物效应并不相互排斥，而是普遍存在于不同的生态系统中。引效应的方向似乎随着植物生产力、根瘤菌圈碳输入量和养分吸收量的变化而波动。这突出表明，如果我们想了解生态系统尺度上的引诱效应，就需要进行长期的综合研究，而且温室和实验室研究必须经过现场验证，以实现可靠的生态升级。在期刊博客上免费阅读本文的通俗摘要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.