河流沉积物有机物分子结构和微生物群落之间的相互作用受到重金属的调节
Ping Li1, Chun Liu2, Lijie Zhang3
1School of Environment and Climate, Jinan University, Guangzhou 510632, PR China.
Journal of hazardous materials
|December 26, 2024
概括
重金属 (HMs) 影响河流沉积物的碳储存. 虽然HM与碳含量相关,但它们可以增加碳含量.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 重金属 (HMs) 影响土壤的碳储存,但它们与河流沉积物中碳结构的相互作用尚不清楚.
- 洛特生态系统微生物群落在重金属和碳动态中介作用需要进一步调查.
研究的目的:
- 研究河流沉积物中的重金属,碳含量和微生物群落的时空变化.
- 探索沉积物有机碳 (OCsed) 和溶解有机物 (DOM) 分子组成的化学结构.
- 阐明重金属,碳结构和微生物之间的相互作用.
主要方法:
- 在河流表面沉积物中分析重金属和碳含量.
- 沉积物有机碳 (OCsed) 化学结构的表征.
- 溶解有机物 (DOM) 的分子分析.
- 评估微生物社区的丰富性和多样性.
主要成果:
- 在OCsed化学结构的空间-时间变化是最小的,而DOM组成随着季节和地点的变化而大幅波动.
- 在铜 (Cu), (Zn), (Pb) 和OCsed含量之间发现了正相关性.
- 在一定范围内,HM通过促进不稳定的O-基C和减少稳定的碳分数,增加了OCsed的矿化风险.
- 适当的HM水平增强了细菌和真菌的丰富性和多样性.
- 细菌消耗了更稳定的OC,而真菌在HM丰富下消耗了特定的DOM分数.
结论:
- 重金属显著影响河流沉积物中的有机碳的化学结构和微生物加工.
- 了解这些HM-碳-微生物相互作用对于预测受污染的水生生态系统中的碳储存潜力至关重要.
- 这些发现提供了对重金属丰富环境中控制碳循环的分子机制的见解.
相关概念视频
Microbial Nutrition
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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
Environmental Applications of Microorganisms
1
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...
1
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
The Sulfur Cycle
43.7K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
43.7K


