强化的水柱低氧导致不成比例的底P释放和N:P不平衡,通过增强的沉积硫酸盐还原
Sangbeom Baek1, Jin-Sook Mok1, Haneul Kim1
1Department of Marine Science and Convergence Technology, Hanyang University, 55 Hanyangdaehak-ro, Ansan, Gyeonggi-do, 15588, South Korea.
Marine pollution bulletin
|February 28, 2026
概括
海洋脱氧加剧了沉积硫酸盐的减少,增加了从沉积物中释放的营养物质. 这种内部营养物质加载推动了肥胖化,破坏了沿海地区的外部减肥努力.
科学领域:
- 海洋化学和生物地球化学
- 沿海生态系统的动态
- 环境科学环境科学
背景情况:
- 海洋脱氧是海洋生态系统日益严重的威胁,由气候变化和人类活动驱动.
- 水柱缺氧 (WCH) 显著影响海洋沉积物的生物地化学过程.
- 韩国的金海湾经常出现季节性WCH,使其成为一个关键的研究领域.
研究的目的:
- 研究水柱低氧强度对沉积硫酸盐减少 (SR) 的调节效应.
- 分析WCH对硫-铁-- (S-Fe-Mn-P) 动态的影响.
- 在不同低氧水平下量化盆地营养流 (BNF) 和 (N):P比.
主要方法:
- 实地监测底层水中的溶氧 (DO) 水平.
- 测量沉积硫酸盐的降解率.
- 对孔水化学的分析,包括硫化物,铁和.
- 基和酸盐流量的量化.
- 营养动态的长期数据分析 (1997-2024年).
主要成果:
- 沉积SR率增加了六倍,因为DO从206 μM下降到17 μM.
- 低氧显著增强了和的释放,流量分别高出6.5和17倍,在严峻的条件下.
- 在严重的WCH下,底流的N:P比率下降了三倍,表明释放不成比例.
- 长期监测证实了来自内部盆地来源的持续的地下水丰富.
结论:
- 强化WCH驱动了沿海沉积物中增强的SR和内部营养再生.
- 来自盆地过程的内部营养物质负载加剧了缺氧易感系统中的轻度缩.
- 由于强大的内部反循环,在经常出现缺氧的沿海地区,外部营养减少策略可能不那么有效.
相关概念视频
Primary Production
25.8K
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.
25.8K
The Phosphorus Cycle
44.5K
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.
44.5K
Metabolism of Chemolithotrophs
1.0K
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.
1.0K
The Sulfur Cycle
52.6K
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
52.6K
Bioremediation
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
Anoxygenic Photosynthesis
1.5K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.5K


