优化驱动的本土有机碳生产降低了碳埋葬效率
Mingquan Lv1, Xinping Wang1, Ping Huang1
1Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China.
Water research
|September 14, 2025
概括
由于沉积物输入量高,池捕获了大量的有机碳 (OC),主要来自植物浮游生物. 然而,温和化增加了不稳定的碳和甲排放,降低了这些小水库的整体碳埋葬效率.
科学领域:
- 环境科学 环境科学
- 临界技术 临界技术
- 生物地质化学生物地质化学
背景情况:
- 堆积物对于有机碳 (OC) 捕获至关重要.
- 池被确定为OC埋葬的热点,但根本机制尚未完全理解.
- 关键问题涉及到是否增强的OC输入或减少的矿化导致高埋葬率.
研究的目的:
- 为了比较欧池和非欧池的OC动态.
- 阐明高OC埋葬率在池中的机制.
- 评估环保化对碳捕获和温室气体排放的影响.
主要方法:
- 沉积物陷被用来测量沉积流量.
- 稳定同位素分析确定了OC的来源 (本土与陆地).
- 化实验量化了OC矿化率和温室气体 (CH4和CO2) 的产生.
- 使用反应连续模型来评估OC埋葬效率 (OCBE).
主要成果:
- 池的沉积流量比水库高出2.4倍,原因是沉积积累的增加.
- 植物浮游生物衍生的OC在池中占主导地位 (69%),而水库则由陆地OC主导 (61%).
- 池的OC矿化速度是OC矿化速度的2.1倍,CH4/CO2比率更高,这表明OC矿化更不稳定.
- 尽管埋葬了更多的绝对OC,但由于快速降解,池的OCBE较低.
结论:
- 在池中高高的OC埋葬主要是由增加的投入,特别是植物浮游生物的生产,而不是减少矿物化的驱动.
- 矛盾的是,通过提供不稳定的碳和增加甲排放,优化降低了OCBE.
- 温池作为高吞吐量,低效率的碳处理器,影响淡水系统的碳捕获和温室气体管理.
相关概念视频
00:46Bioremediation
22.1K
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.
22.1K
01:14The Carbon Cycle
43.2K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
43.2K
01:06Primary Production
25.1K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
25.1K
01:15Metabolism of Chemolithotrophs
790
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.
790
01:28Carbon-dioxide Fixation
648
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...
648
01:21The Phosphorus Cycle
43.7K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
43.7K