河岸地区的氧化还原振荡通过增强微生物呼吸来刺激碳损失
Zhenchen Li1, Xiaoyun Li1, Binquan Jiao2
1Key laboratory of the Three Gorges Reservoir Region's Eco-environments, Ministry of Education, Institute of Environment and Ecology, Chongqing University, 174 Shapingba Road, Chongqing 400045, China.
Water research
|March 4, 2026
概括
沿海地区的减氧振荡降低了微生物碳利用效率,加速了碳损失. 铁循环和基激素主要燃烧有机物质,将生态系统变成碳泄漏热点.
科学领域:
- 环境科学 环境科学
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
背景情况:
- 沿海生态系统在碳捕获中发挥着至关重要的作用.
- 氧化还原振荡对微生物碳代谢的影响尚不清楚.
- 在波动的氧化还原条件下,非生态驱动因素和微生物反应需要进一步研究.
研究的目的:
- 阐明氧化还原振荡与微生物碳利用效率 (CUE) 之间的机械联系.
- 研究铁循环和有机物转化如何受到氧化还原振荡的影响.
- 了解微生物群落和在氧化还原振荡条件下的代谢转变.
主要方法:
- 控制的化实验模拟氧化还原振荡.
- 对铁物种和无形铁池的分析.
- 矿物相关有机碳 (MAOC) 的量化及其生物降解性.
- 微生物群落和代谢产物的元基因组和代谢组分析.
- 测量基 (•OH) 的产生.
主要成果:
- 氧化还原振荡显著降低了微生物CUE,导致与静态条件相比碳损失增加.
- 在氧化还原振荡下铁循环减少无形Fe,释放可生物降解的MAOC并通过OH去聚合芳香物质.
- 甲基因组和代谢组数据显示了微生物群落和代谢物概况的显著变化.
- 微生物的代谢途径,包括酸途径和TCA循环,被激活用于基质矿化.
结论:
- 确定了一种结合的非生物-生物"燃烧和燃烧"机制,由铁循环和微生物呼吸驱动.
- 反氧振荡区作为重要的碳泄漏热点,影响陆地碳汇.
- 了解这些机制对于预测不断变化的环境中的碳动态至关重要.
相关概念视频
01:46The Calvin Benson Cycle
7.0K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
7.0K
01:15Metabolism 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
01:24Redox Reactions
59.2K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
59.2K
01:27Redox Reactions
1.3K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
1.3K
00:46Bioremediation
22.6K
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.
22.6K
01:23Redox Equilibria: Overview
1.7K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.7K