草原土壤微生物群落的变暖影响在凉爽的月份被放大
Jiesi Lei1, Yuanlong Su1, Siyang Jian2
1State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
The ISME journal
|May 15, 2024
概括
全球变暖在寒冷的月份刺激了土壤微生物,增加了碳分解潜力. 这挑战了季节性采样规范,并揭示了微生物在全年对变暖的明显反应.
科学领域:
- 生态生态学 生态生态学
- 微生物生态学 微生物生态学
- 气候变化科学 气候变化科学
背景情况:
- 土壤呼吸 (RS) 受全球变暖通过微生物分解的影响,但微生物反应的季节性变化不明.
- 实验性变暖对土壤微生物群落动态及其长期功能特征的影响尚不清楚.
研究的目的:
- 在实验性变暖下,在12个月内调查土壤微生物群落的时间动态.
- 了解气候变暖如何影响微生物功能特征,碳分解和土壤呼吸季节性.
- 阐明温暖化调节土壤呼吸和异质呼吸 (Rh) 的机制.
主要方法:
- 在高草草原生态系统中经过12个月的土壤微生物群落的纵向研究,并进行实验性变暖.
- 对微生物群落分类学和功能组成的分析.
- 测量微生物代谢系数,核糖体RNA操作子拷贝数和微生物碳利用效率 (CUE).
- 建模分析,包括结构方程建模,以评估变暖的直接和间接影响.
主要成果:
- 变暖改变了微生物群落的组成和功能潜力,特别是在寒冷的月份.
- 在凉爽的月份,变暖增加了碳分解的基因组潜力,rrn拷贝数和代谢系数,表明刺激了快速生长的微生物.
- 变暖使微生物CUE的温度敏感性在低温下降了28.7%,导致CUE降低和Rh潜力增加.
- 变暖直接通过土壤温度调节Rh和RS,间接通过微生物特征,土壤水分,酸盐,pH和总初级生产率.
结论:
- 在寒冷的月份,变暖对微生物的功能特征有明显的影响,影响碳循环.
- 这些发现挑战了仅在高峰生长季节取土壤样本的做法.
- 这项研究促进了对土壤季节性呼吸和异质型呼吸对全球变暖反应的机制性理解.
相关概念视频
Responses to Heat and Cold Stress
13.4K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.4K
Global Climate Change
24.3K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.3K
The Roles of Bacteria and Fungi in Plant Nutrition
35.3K
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
35.3K
The Soil Ecosystem
19.8K
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
19.8K


