输入通过凌驾于消费者控制之上来抑制植物多样性
Xiaofei Li1,2, Dean E Pearson3,4, Yvette K Ortega3
1College of Resources and Environmental Sciences, Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases in Jilin Province, Jilin Agricultural University, Changchun, Jilin, China.
Nature communications
|July 2, 2025
概括
人为的沉积威胁着生态系统. 这项研究显示,添加会破坏食草控制,增加植物生物量和占主导地位,导致草原的植物多样性大幅减少.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 植物群生态学 植物群生态学
背景情况:
- 人为 (N) 沉积是影响陆地生态系统的全球环境问题.
- 预计沉积会增加植物的生产力,但通过有利于主导物种而减少植物的多样性.
- 草食动物被假设通过消耗多余的植物生物质来抵消N沉积效应.
研究的目的:
- 研究添加对草原生态系统中草原动物上下控制和植物多样性的影响.
- 确定丰富如何影响草食动物和植物群落之间的相互作用.
主要方法:
- 进行了一项多因素实地实验,以评估添加和草食动物存在的影响.
- 测量包括总植物生物量,社区占主导地位,食草动物丰富度和植物香农多样性.
- 研究了相互作用的机制,包括植物化学和建筑对食草动物和捕食者的影响.
主要成果:
- 在环境水平下,虫抑制了生物量和主导地位,增加了植物多样性 (自上而下的控制).
- 没有,添加增加了生物质,但没有改变植物的多样性.
- 对于,添加消除了草食动物的控制,增加了生物量和主导地位,并将植物多样性减少了21%.
结论:
- 沉积可以破坏草原生态系统中草食动物施加的自上而下的控制.
- 添加对植物多样性产生负面影响,因为它减少了草食动物的数量和有效性.
- 沉积可以将生态系统的控制从上向下 (由草食动物驱动) 转移到下向上 (由资源驱动),损害植物多样性.
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