在瓦多和和区土壤中,Commmox氨氧化和N2O生产
Shanyun Wang1, Ruiliang Xu2, Manyi Xiao2
1Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085, Beijing, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Water research
|November 15, 2025
概括
完全氧化氨 (comammox) 显著推动了沿海地区的氧化 (N2O) 排放. 这一过程是N2O的主要来源,超越了其他氨氧化途径,为控制污染提供了新的策略.
科学领域:
- 环境微生物学环境微生物学
- 生物地质化学生物地质化学
- 土壤科学 土壤科学
背景情况:
- 沿海地区是氧化 (N2O) 排放的关键热点.
- 氨氧化是河流系统中N2O生产的关键过程.
- 控制沿海地下区域N2O生产的机制尚不清楚.
研究的目的:
- 研究完整的氨氧化 (comammox) 在沿海地下土壤中N2O生产中的作用.
- 量化comammox对氨氧化和N2O排放的贡献,与细菌和古生物学途径相比.
- 探索沿海环境中的comammox细菌的代谢能力.
主要方法:
- 基因组组装基因组 (MAG) 是从河岸土壤特征生成的.
- 使用元基因组对接分析来识别和描述comammox细菌.
- 对氧化和N2O生产的comammox贡献的量化在不同的土壤区域 (瓦多和和) 中进行.
主要成果:
- 康马莫克斯对沿海地下土壤中的氨氧化有显著的贡献,与细菌氨氧化相当,并且超过了古老的路径.
- 康马莫克斯在和和区中主导氨氧化,特别是在夏季.
- 康马莫克斯是N2O生产的主要生物途径,在两种土壤区域中,它比古生物学和细菌氨氧化产生更高的N2O产量.
结论:
- 完全氧化氨 (comammox) 是沿河地下区域N2O生产的重要驱动因素.
- 康马莫克斯细菌的多样化代谢途径,包括将酸盐减少为氨,有助于它们的生态成功.
- 了解comammox的作用为管理沿海生态系统中污染提供了关键的见解.
相关概念视频
01:15Metabolism of Chemolithotrophs
741
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.
741
01:20Overview of Nitrogen Metabolism
10.9K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
10.9K
01:22Inorganic Nitrogen Assimilation
441
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
441
01:49The Nitrogen Cycle
59.4K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
59.4K
00:46Bioremediation
22.0K
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.
22.0K
01:30Environmental Applications of Microorganisms
918
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...
918