由于硫酸盐含量升高而引起的缩湖沉积物中的的调动
Lanqing Zhang1, Miaotong Yu1, Simin Yu1
1School of Environment, Nanjing Normal University, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Jiangsu Key Laboratory of Environmental Change and Ecological Construction, Nanjing 210023, China.
The Science of the total environment
|September 12, 2024
概括
环氧化湖中的硫酸盐含量升高会导致从沉积物中释放出来. 这项研究表明,硫循环动员铁结合 (FeP) 和有机 (OP),而OP矿化是内源释放的关键因素.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 欧湖通常具有较高的硫酸盐含量,与内源释放有关.
- 以前的研究集中在铁结合 (FeP) 释放上,忽视了有机 (OP) 的动态.
- 了解OP动员至关重要,因为它是沉积物中重要的活池.
研究的目的:
- 研究硫酸盐减少对淡水沉积物调动的影响.
- 为了确定FeP和OP在不同硫酸盐条件下释放的作用.
- 阐明硫循环对内源释放的贡献.
主要方法:
- 中宇宙实验,添加乳酸盐和控制硫酸盐度.
- 监测硫酸盐,硫化物和 (总溶解,酸盐) 的水平.
- 对微生物群落的分析,包括减少硫酸盐的细菌,减少铁的细菌和发酵细菌.
- 在沉积物中量化FeP和OP含量.
主要成果:
- 乳酸盐添加刺激了硫酸盐的减少,导致硫酸盐度降低和硫化物度增加.
- 总溶解和酸盐度在上层水中显著增加,特别是在较高的初始硫酸盐水平下.
- 铁氧化物释放 (由于氧化铁的减少和硫化物调解) 和OP矿化都对的调动作出了贡献.
- 在表面沉积物中,OP矿化占总减少的80%以上.
结论:
- 硫循环是FeP和OP在温湖沉积物中的动员的一个关键驱动因素.
- OP矿化成为内源释放的潜在主导途径.
- 这突显了水生生态系统中硫,铁和循环的相互联系.
相关概念视频
The Phosphorus Cycle
36.6K
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.
36.6K
Factors Affecting Solubility
33.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.3K
Ionic Strength: Effects on Chemical Equilibria
1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.4K
Primary Production
23.6K
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.
23.6K
The Sulfur Cycle
43.9K
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...
43.9K
Phosphorylation
50.1K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
50.1K


