平原皮卡的干扰改变了土壤的细菌功能和外酶的丰富性,以调节阿尔卑斯山草原的C循环路径
Jing Li1,2, Qing Wang2, Baolong Zhu1
1School of Civil Engineering and Architecture, Southwest Science and Technology University, Mianyang 621010, China.
International journal of molecular sciences
|December 17, 2024
概括
高原皮卡干扰影响了阿尔卑斯山草原的土壤有机碳 (SOC) 储存. 皮卡活动可以在轻度和中度退化的地区增强SOC,但通过改变细菌代谢来减少严重退化的草原.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 微生物学 微生物学
背景情况:
- 高原皮卡 (Ochotona curzoniae) 是青海-西藏高原土壤有机碳 (SOC) 储存的关键.
- 皮卡干扰对不同降解的高山草原中的细菌SOC代谢的影响尚不清楚.
研究的目的:
- 研究平原皮卡干扰如何影响土壤的物理化学特性和细菌群落.
- 确定皮卡干扰对细菌SOC新陈代谢在不同程度的草原降解的影响.
主要方法:
- 对照和皮卡扰乱的草原之间的土壤物理化学特性和细菌群体组成和功能的比较.
- 在不同降解级别的分析:未降解 (UDM),轻降解 (LDM),中度降解 (MDM) 和严重降解 (SDM).
- 评估细菌的OTU,外酶丰富度和碳循环路径.
主要成果:
- 皮卡干扰显著改变了细菌群体组成,在LDM和MDM中增加了细菌OTU,但在SDM中降低了它们.
- 皮卡干扰调节了与有机物分解相关的外酶活性,在LDM和MDM中增加它,同时在SDM中减少它.
- 在LDM和MDM中,SOC含量增加,但在SDM中降低,与细菌碳循环路径的改变相关 (乙醇生产与二氧化碳转化中的酸盐).
结论:
- 平原皮卡干扰对SOC储存有双重影响,通过促进乙醇生产途径,在不太退化的草原中增强SOC储存.
- 在严重退化的草原中,皮卡干扰可以通过调节酸盐转化为二氧化碳,从而对SOC储存产生负面影响.
- 土壤退化水平是影响皮卡干扰对土壤细菌群落和碳循环的关键因素.
更多相关视频
10:31Isolation and Analysis of Microbial Communities in Soil, Rhizosphere, and Roots in Perennial Grass Experiments
Published on: July 24, 2018
54.6K
09:06Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
7.9K
相关概念视频
The Roles of Bacteria and Fungi in Plant Nutrition
35.0K
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.
35.0K
Threats to Biodiversity
22.1K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.1K
Factors Influencing Microbial Growth: pH
Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...
Metabolism of Chemolithotrophs
1
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
1
Ecological Disturbance
17.0K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
17.0K
Carbon-dioxide Fixation
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...
