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一种景观岩石学方法来评估沉积物孔水中的可溶性反应的控制和内部负载风险

Mauro B de Toledo¹, Helen M Baulch¹

¹School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK, Canada; Global Institute for Water Security, University of Saskatchewan, 11 Innovation Blvd, Saskatoon, SK S7N 3H5, Canada.

The Science of the total environment

|September 5, 2024

概括

在加拿大各个湖泊中,内部含量差异很大. 沉积物和湖中的因素,如pH值,深度和/铁含量,影响可溶性反应 (SRP) 度,影响水生生产力.

科学领域:

环境科学环境科学
临界技术临界技术
水生化学水生化学

背景情况:

沉积物营养物质的内部负载显著影响水生生态系统的生产力.
沉积物孔水中的可溶性反应 (SRP) 是潜在的内部负荷 (IPL) 的关键指标.
了解影响孔水SRP的因素对于管理湖水质量至关重要.

研究的目的:

调查加拿大湖泊沉积物孔水中可溶性反应 (SRP) 度的变化.
为了确定影响SRP和内部负荷 (IPL) 的关键环境因素,在各种湖泊类型中.
评估湖内和流域特征的预测能力,以估计孔水SRP.

主要方法:

分析了来自加拿大143个湖泊的沉积物样本中的孔水SRP度.
与湖内变量 (深度,pH,热量状态) 和沉积物特征 (Al:P,Fe:P比率) 相关联的孔水SRP.
利用流域数据 (土壤类型,土地使用) 和湖内测量来开发孔水SRP的预测模型.

主要成果:

观测到孔水SRP的~2400倍变化,表明IPL潜力非常可变.
湖泊深度,pH,热量状态和沉积物Al:P和Fe:P比率显著影响了孔水SRP.
高pH值,高度条件和浅水深与孔水SRP的增加有关;高的Al:P和Fe:P比率降低了它.
孔水SRP的显著区域差异与生态区,土壤类型和土地利用有关,北极平原和草原的度高于北极盾.
湖内测量 (pH,盐度) 解释了孔水SRP变异的6072%,而流域预测器解释了~50%.

结论:

水SRP和IPL在加拿大湖泊中表现出相当大的变异性,受地质,水文和石化学因素的结合影响.
易于测量的湖内和流域变量可以准确预测孔水SRP并估计IPL风险.
整合流域和湖内数据的景观水泥学方法为有效的湖泊管理和营养来源识别提供了有前途的工具.

关键词:

内部负荷的风险内部负荷的风险湖泊沉积物的沉积物.景观岩石技术景观岩石技术生物地质化学生物地质化学的扩散流是的扩散流.波尔水 SRP 的时间

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

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.

Factors Affecting Solubility

Factors Affecting Solubility

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: