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大气中二氧化碳的突然增加高估了模型植物-土壤系统中的社区反应
John N Klironomos1, Michael F Allen, Matthias C Rillig
1Department of Integrative Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. jklirono@uoguelph.ca
Nature
|February 11, 2005
概括
暴露于大气中二氧化碳 (CO2) 急剧增加的生态系统与 CO2 逐渐增加的生态系统相比,表现出不同的真菌社区反应. 逐渐增加的二氧化碳导致真菌多样性和功能发生了较小,不显著的变化.
科学领域:
- 生态生态学 生态生态学
- 菌类学 菌类学是指菌类学.
- 气候变化生物学 气候变化生物学
背景情况:
- 了解大气中二氧化碳 (CO2) 增加对生态的影响至关重要.
- 大多数研究使用突如其来的,单步增长来模拟未来的二氧化碳水平.
- 突如其来的二氧化碳增加模仿了渐进的,多十年的变化这一假设尚未在实验上得到验证.
研究的目的:
- 测试大气二氧化碳度的突然或逐渐增加是否会在菌根真菌群体中引起类似的反应.
- 在不同的二氧化碳暴露场景下比较真菌群落的结构和功能变化.
主要方法:
- 一个为期六年的实验是在菌根真菌群体上进行的.
- 建立了两个二氧化碳处理组:突然增加和21代的逐渐增加.
- 在两个治疗组中,监测了真菌物种的丰富性和菌根的功能,并与环境二氧化碳水平进行了比较.
主要成果:
- 突发的二氧化碳增加导致真菌物种丰富度立即下降,并显著改变了菌根的功能.
- 暴露于逐渐增加的二氧化碳的真菌群体在多样性和功能上表现出较小的变化.
- 渐进式二氧化碳处理组的变化幅度与环境二氧化碳控制组没有显著差异.
结论:
- 二氧化碳增加的方法 (突然或逐渐) 显著影响生态系统的反应,特别是真菌群落.
- 以前使用CO2突然增加的研究可能高估了一些生态反应.
- 生态系统及其生物群可能对环境变化的速度敏感,而不仅仅是变化的程度.
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