细菌食原虫通过负反循环抑制化和污染土壤中的N2O排放
Xuehua Wang1, Youjing Wang1, Di Tong1
1Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China.
Journal of hazardous materials
|November 28, 2024
概括
土壤原石减轻重金属污染对循环的影响. 这些微生物减少了刺激的化和N2O排放,特别是在应用肥时,提高了使用效率.
科学领域:
- 土壤微生物学 土壤微生物学
- 环境科学环境科学
- 生物地质化学生物地质化学
背景情况:
- 人类活动,如重金属污染和化肥,显著影响土壤 (N) 过程.
- 在这些条件下,土壤原生体在调解N转换中的作用仍未得到充分研究.
- 了解这些相互作用对于可持续的土壤N管理和环境保护至关重要.
研究的目的:
- 调查形原体 (Colpoda steinii) 对土壤N转化过程的影响.
- 评估原生虫如何影响细菌群落和N循环在不同的 (Cd) 污染水平和 (N) 施肥下.
- 为了阐明原生体,细菌和土壤N动态之间的多性相互作用.
主要方法:
- 进行了微观实验来模拟土壤条件.
- 不同级别的 (Cd) 污染 (0-3毫克/公斤-1) 已被应用与或没有 (N) 施肥.
- 量化了Colpoda steinii对细菌菌群和N转化率 (净化,N2O排放) 的影响.
主要成果:
- 暴露,通过hormesis,最初刺激了净化和N2O排放,其效应被N的添加放大了.
- 原生虫 (Colpoda steinii) 减弱或逆转Cd诱导的化和N2O流动的刺激,特别是在N受精下.
- 抗原体减少了化和脱细菌的种群,导致净化率降低 (高达91%) 和N2O排放 (高达36%).
结论:
- 土壤原生植物在减轻重金属污染对土壤循环的负面影响方面发挥着关键的监管作用.
- 质体对N转化产生负面反,减少N损失,并可能增加受污染的农业生态系统中的N使用效率.
- 这项研究强调了在评估重金属污染对土壤营养循环的影响时,考虑多营养相互作用中的土壤掠食的重要性.
相关概念视频
Metabolism of Chemolithotrophs
2
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.
2
Overview of Nitrogen Metabolism
7.8K
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...
7.8K
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 Nitrogen Cycle
51.6K
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...
51.6K
Environmental Applications of Microorganisms
2
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...
2
Carbon-dioxide Fixation
1
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...
1


