在不受干扰和受干扰的北极原生态系统中,与铁的相互作用
Matthew John Berens1, Alexander Bryce Michaud2,3,4, Erin VanderJeugdt5
1Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Environmental science & technology
|June 18, 2024
概括
北极原土壤显示 (P) 与未受干扰地区的铁 (Fe) 矿物质有关,但在采矿等干扰后转变为 (Ca). 这影响了P的可用性和运输到水生生态系统.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- (P) 是一个关键的营养物质,限制了北极原的生物过程.
- 土壤矿物学在这些生态系统中的P保留和生物可用性中的作用尚不清楚.
- 了解P-矿物相互作用对于预测营养循环和生态系统对环境变化的反应至关重要.
研究的目的:
- 描述 (P) 物种化及其与北极原土壤矿物质的关联.
- 研究P-矿物联体在山坡拓序列以及未受干扰和受干扰的原之间如何不同.
- 评估干扰对P生物可用性和潜在传输的影响.
主要方法:
- 使用X射线吸收光谱 (XAS) 分析P物种化和矿物联体.
- 从阿拉斯加北坡的各个地点采集了土壤样本,包括山坡的土壤序列和湿的土.
- 与未受干扰和受干扰 (石开采,热石岩) 的地点进行了比较,以评估物理干扰的影响.
主要成果:
- 在未被干扰的湿草原中发现了生物铁 (Fe) 氧化地毯,结合P.
- 扰乱的土壤和沉积物缺乏这些铁,并且Fe.
- 在山坡土壤中,P主要是有机的,与未受干扰的湿中的Fe (III) 以及受干扰的池沉积物中的Ca相关.
结论:
- 酸盐结合到Fe(III) 氧化在未被干扰的湿土壤中,受到生物的影响.
- 物理干扰,如采矿和热石岩,破坏这些Fe,改变P结合机制.
- 由于北极原扰乱的增加,P-矿物质协会的变化可能会影响生物可用P的运输到水生生态系统.
相关概念视频
The Phosphorus Cycle
36.7K
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.
36.7K
Phosphoinositides and PIPs
8.5K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
8.5K
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
Protein Kinases and Phosphatases
13.1K
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
13.1K
Introduction to Electrolytes
10.2K
In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
Role of Sodium
One...
Role of Sodium
One...
10.2K
Essential Minerals for Bone Health
3.9K
The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
3.9K


