Journal of Plant Ecology ›› 2023, Vol. 16 ›› Issue (3): 0-rtac110.DOI: 10.1093/jpe/rtac110

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优势种对藏北草原群落稳定性具有主导作用

  

  • 收稿日期:2022-07-08 修回日期:2022-09-09 接受日期:2022-12-20 出版日期:2023-06-01 发布日期:2023-01-02

Dominant species play a leading role in shaping community stability in the northern Tibetan grasslands

Ge Hou1,3, Peili Shi1,3,*, Tiancai Zhou1,3, Jian Sun2, Ning Zong1,*, Minghua Song1, Xianzhou Zhang1,3   

  1. 1Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
    2State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;
    3College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China

摘要: 优势种作为群落动态和生态系统的重要驱动因素,对生物条件以及与其他物种的相互作用具有强烈的影响,这一现象在高寒草地生态系统中尤其明显。然而,不同生态系统中优势种对群落稳定性的影响作用却知之甚少。本文研究了藏北草原4大高寒草地(高寒草甸、高寒草甸草原、高寒草原和高寒荒漠草原)地上生产力的时间稳定性(2014-2020年)和群落稳定性机制,并分析了群落特征和物种组成的变化。研究结果表明,高寒草甸的群落稳定性显著高于其他3种草地。这种差异主要归因于高寒草甸较高的补偿效应和选择效应。此外,优势种通过增加其稳定性和异步性来维持群落稳定性。这些研究结果表明了优势种作为群落的基础物种,可能在塑造高寒草原群落稳定性方面发挥着主导作用。因此,在日益加剧的环境波动下,保护优势种对于脆弱生态系统稳定生态系统功能至关重要。

关键词: 群落稳定性, 物种丰富度, 优势种, 补偿效应, 选择效应

Abstract: Dominant species may strongly influence biotic conditions and interact with other species, and thus are important drivers of community dynamics and ecosystem functioning, particularly in the stressed environment of alpine grasslands. However, the effects of dominant species on the community stability of different ecosystems remain poorly understood. We examined the mechanisms underlying temporal stability (2014-2020 year) of aboveground productivity and community stability in four alpine grasslands (alpine meadow, alpine meadow steppe, alpine steppe and alpine desert steppe) of the northern Tibetan with different species composition and dominance. Our results showed that community stability was significantly higher in the alpine meadow than in the other three types of grasslands. This difference was mainly attributed to the higher compensatory effect and selection effect in the alpine meadows. Furthermore, dominant species strongly affected community stability by increasing dominant species stability and species asynchrony. However, species richness had little effect on community stability. Our findings demonstrate that dominant species, as foundation species, may play leading roles in shaping community stability in the alpine grasslands, highlighting the importance of conserving dominant species for stable ecosystem functioning in these fragile ecosystems under increasing environmental fluctuations.

Key words: community stability, species richness, dominant species, compensatory effect, selection effect