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相关概念视频

The Phosphorus Cycle01:21

The Phosphorus Cycle

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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.
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Primary Production01:06

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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.
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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:
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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
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Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
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The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
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相关实验视频

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Author Spotlight: Unveiling Plankton Response to Climate Change Through Time-Series Data and Artistic Expression
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观察到上海酸盐到酸盐可用性的下降.

Skylar D Gerace1, Jun Yu1, J Keith Moore1

  • 1Department of Earth System Science, University of California, Irvine 92697.

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概括

海洋变暖加深了斯法克林,但没有尼特拉克林,影响了海洋营养素的可用性. 这表明未来的压力对植物浮游生物,影响海洋食物网和生物地球化学.

关键词:
红场比率是指红场比率.气候变化 气候变化 气候变化营养素 营养素 营养素海洋的海洋海洋的海洋.史泰基几何学 (Stoichiometry) 是一种测量体位的方法.

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科学领域:

  • 海洋学 海洋学 海洋学
  • 海洋生物地质化学海洋生物地质化学
  • 气候变化影响 气候变化影响

背景情况:

  • 气候变暖导致海洋分层的增加,可能减少上层海洋的营养供应.
  • 这种营养减少可以降低海洋初级生产力,并破坏海洋食物网.
  • 由于度低,直接观察表面海洋营养物质的变化是很困难的.

研究的目的:

  • 建立营养线深度作为上海营养物质可用性和生产力的可靠指标.
  • 通过分析营养线深度来评估营养素可用性的当代全球趋势.
  • 通过地球系统模型模拟来研究影响营养趋势的机制.

主要方法:

  • 使用全球数据库观察到的垂直酸盐和酸盐概况 (1972-2022) 量化了营养素深度.
  • 分析了素 (P-营养素) 和素 (N-营养素) 深度的趋势.
  • 利用地球系统模型 (ESM) 模拟来测试关于分层效应和营养循环的假设.

主要成果:

  • 全球范围内,素主要在深化,特别是在南半球.
  • 尼特拉克林在很大程度上显示稳定的趋势.
  • 据ESM模拟显示,铁应力降低和固化增加,使得尼特拉克林能够缓冲分层,与斯法克林不同.

结论:

  • 当代趋势表明,对海洋浮游植物来说,压力增加了,但压力并没有增加.
  • 这些趋势预计将持续下去,对海洋生物地质化学有重大影响.
  • 不同的营养压力将影响海洋食物网的动态和生态系统的功能.