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添加气通过增强时间同步和种群变异性来降低高山草原的稳定性

Minghua Song¹, Yuqiang Tian^2,3, Qiwu Hu⁴

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, A11, Datun Road, Chaoyang District, Beijing, 100101, China. songmh@igsnrr.ac.cn.

|February 5, 2026

概括

丰富会随着时间的推移减少草原植物的多样性和生产力. 长期添加会导致一连串的效应,通过物种丧失和变化的种群动态来降低稳定性.

科学领域:

生态生态学生态生态学
环境科学环境科学
植物社区动态植物社区动态

背景情况:

在草原上缩通常会增加短期生产力,但会降低植物多样性和长期生产力.
(N) 丰富下的短期稳定性损失通常与物种同步有关,而不是物种丧失.
长期的丰富可能导致持续的物种丧失,增加种群变化,影响社区生产力稳定.

研究的目的:

调查畜牧排斥和 (N) 丰富对高山草原物种丰富性和地面生产力稳定性的长期影响.
在19年的实验期内阐明驱动草原稳定性变化的机制.

主要方法:

在阿尔卑斯山草原进行了为期19年的实地实验,操纵了牲畜排斥和 (N) 丰富.
分析了物种丰富性,物种同步性,种群变异性和功能多样性随着时间的推移的变化.
在不重叠的5年时间窗口中评估了地面生产率的稳定性.

主要成果:

在连续的5年期间,地面生产率稳定性下降.
最初的稳定性损失是由增加的物种同步驱动的,随后是同步和主导物种变化的复合效应.
后来的稳定性下降受到功能多样性丧失和附属物种变异性的影响,与N形式相关.

结论:

丰富引发了阿尔卑斯山草原的时间依赖的不稳定级联,从同步驱动的转变为人口变化驱动的不稳定.
植物多样性对于保持草原功能至关重要,它通过平衡同步和种群变异性来维持草原的功能,而不仅仅是通过提高生产力.
保护植物多样性对于确保生态系统在全球变化情景下正常运作至关重要.

关键词:

生态系统的稳定性生态系统的稳定性通过缩气进行缩.主要生产率的生产率.种类的多样性物种的多样性.西藏高原是西藏的高原.

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