相关实验视频
Updated: Sep 15, 2025

08:39
Simulating Temperature in a Soil Incubation Experiment
Published on: October 28, 2022
3.1K
地下有机碳对气候变暖和变冷的反应是由微生物群体而不是其分子组成决定的
Yuzhang Li1,2, Yao Wei1,2, Lile He1
1Qinghai Haibei National Field Research Station of Alpine Grassland Ecosystem, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.
Ecology letters
|July 15, 2025
概括
长期的土壤变暖减少了阿尔卑斯山草原的土壤有机碳 (SOC) 储存,而冷却增加了它. 变暖改变了微生物群落,影响了SOC储存机制.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 气候变化对土壤有机碳 (SOC) 储存的长期影响及其与微生物群落的关系仍然不清楚.
- 了解这些动态对于预测生态系统对气候变化的反应至关重要.
研究的目的:
- 研究长期的土壤变暖和冷却如何影响地下SOC分子组成,微生物群落结构和SOC储存.
- 阐明推动青海-西藏高山草原发生这些变化的机制.
主要方法:
- 一个长达16年的实地实验,涉及土壤变暖和冷却处理.
- 分析地下SOC含量,分子组成和微生物群落结构 (真菌与细菌的比率和阳性与阴性细菌的比率).
- 评估土壤碳的比例.
主要成果:
- 升温显著降低了8.5%的SOC含量,而降温则增加了7.0%.
- 两种处理都没有改变植物或微生物衍生的分子组件.
- 变暖增加了真菌与细菌 (F/B) 和阳性与阴性细菌 (G+/G-) 的比率,减少了SOC的储存.
- 冷却降低了F/B和G+/G-比率,提高了SOC的储存.
结论:
- 土壤变暖通过改变微生物群落结构 (F/B和G+/G-比率升高) 和降低土壤C:N比率,对地下SOC储存产生负面影响.
- 土壤冷却增强了SOC储存,主要是通过减少微生物生物质比率.
- 在气候变化研究中排除冷却效应可能会导致低估变暖对高山草原SOC池的负面影响.
更多相关视频
相关概念视频
The Carbon Cycle
39.9K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
39.9K
Global Climate Change
24.8K
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.
24.8K
The Soil Ecosystem
21.8K
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:
21.8K
Carbon-dioxide Fixation
87
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
87
Environmental Applications of Microorganisms
268
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
268
What are Biogeochemical Cycles?
34.4K
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.
34.4K

