热浪诱导的微生物热特性适应及其在亚北极地区的逆转
Dániel Tájmel1,2, Carla Cruz-Paredes1,2, Johannes Rousk1,2
1Microbial Ecology, Department of Biology, Lund University, Lund, Sweden.
Global change biology
|November 24, 2023
概括
北极土壤微生物适应了热浪,改变了它们的生长温度. 然而,由于湿度较低,变暖降低了微生物效率,一年后部分恢复.
科学领域:
- 生态生态学 生态生态学
- 微生物学 微生物学
- 气候科学 气候科学
背景情况:
- 北极和亚北极生态系统面临着重大的气候变化影响,包括气温上升和热浪.
- 土壤微生物的分解对温度敏感,使微生物对变暖的反应对气候反至关重要.
- 了解土壤微生物的热特性对于预测生态系统对气候变暖的反应至关重要.
研究的目的:
- 研究模拟夏季热浪对亚北极树林中土壤微生物生长和呼吸的热特征分布的影响.
- 评估这些热特性随时间变化的持久性,包括冬季后的恢复.
- 确定变暖对微生物群落组成和碳使用效率的影响.
主要方法:
- 在一个亚北极树林中进行了一个变暖实验,模拟夏季的热浪.
- 在温暖期之前,期间和之后测量了微生物生长和呼吸的温度依赖性.
- 分析了微生物群落的组成 (α和β多样性) 和碳使用效率.
主要成果:
- 变暖导致细菌和真菌生长向适应温暖的热特性转移,但不是呼吸.
- 微生物的过程速度下降是由于水分减少,而不是基板耗尽,导致碳使用效率降低.
- 尽管热特征发生了变化,但微生物群落组成 (α和β多样性) 保持不变.
- 热转移的细菌热特征在一个冬天后部分恢复,在一年后完全恢复.
结论:
- 亚北极的热浪改变了微生物的热特性分布,影响了土壤的过程.
- 由于变暖而降低的湿度是微生物活动减少和碳利用效率的主要驱动因素.
- 微生物热特征的调整可以独立于社区组成的重大变化发生,恢复率各不相同.
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