土壤酸化引起的氨和亚酸氧化异步下降,减少了亚酸积累和氧化排放
Jun Wang1, Xinlei Wang1, Liping Yang1
1Anhui Agricultural University, Hefei 230036, China.
Journal of agricultural and food chemistry
|March 11, 2026
概括
土壤酸化减少了氧化 (N2O) 的排放,因为它抑制了氨氧化,而不是酸盐氧化,特别是在玉米根系球中. 保持土壤pH平衡对于控制N2O释放至关重要.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 氧化 (N2O) 是一种强有力的温室气体,与土壤中酸盐 (NO2-) 水平有关.
- 在酸性条件下和作物根区中N2O和NO2-之间的关系尚不清楚.
研究的目的:
- 调查土壤酸化对转化和玉米根球和散土中的N2O排放的影响.
- 为了确定pH值如何影响氨氧化和酸盐氧化之间的平衡.
主要方法:
- 在土壤pH梯度 (4.2-6.8) 上对变化的分析.
- 测量N2O排放和NO2-在玉米根球和散土中的积累.
- 评估潜在的氨氧化率 (PAO) 和潜在的酸盐氧化率 (PNO).
- 微生物社区分析侧重于氨氧化细菌和酸盐氧化剂.
主要成果:
- 随着土壤酸度的增加,N2O排放量显著下降,特别是在根球中.
- 在酸性条件下观察到减少的NO-积累,这是由于PAO的抑制比PNO更强.
- 酸化优先抑制氨氧化细菌,降低PAO/PNO比率.
- 根球中NO-和N2O的丰富仅在pH>5.2时才发生,在pH4.2时这种效应会减弱.
结论:
- 土壤酸化通过分离氨和酸盐氧化,主要通过抑制氨氧化剂来抑制N2O排放.
- 增加土壤pH值可能会通过破坏这两个关键微生物过程之间的平衡来增强树根层N2O排放.
- 管理土壤pH对于控制农业系统中N2O排放至关重要,特别是在酸性土壤和树根球环境中.
相关概念视频
Overview of Nitrogen Metabolism
12.4K
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...
12.4K
Inorganic Nitrogen Assimilation
741
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...
741
Metabolism of Chemolithotrophs
1.1K
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.
1.1K
2° Amines to N-Nitrosamines: Reaction with NaNO2
5.6K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
5.6K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
4.0K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
4.0K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
5.1K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
5.1K


