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在加拿大萨斯喀彻温省的一连串温和的硬水湖中,内部加载

Michelle S Wauchope-Thompson¹, Helen M Baulch¹, Barbara J Cade-Menun²

¹School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada.

The Science of the total environment

|March 8, 2024

概括

在硬水湖中,在低氧条件下,沉积物 (P) 的释放量更高. 沉积物中的 (Ca) 起着关键作用,影响P流量,并可能在这些水生生态系统中取代氧化还原控制.

科学领域:

环境科学环境科学
临界技术临界技术
地质化学地质化学

背景情况:

沉积物是湖泊中 (P) 循环的关键调节者,作为水柱的来源或沉.
氧化还原过程在富含铁 (Fe) 的软水湖中显著影响P流量,但它们在硬水湖中的作用仍未得到充分研究.
硬水湖的特点是高pH值和高度的 (Ca),它对氧化还原变化不那么敏感.

研究的目的:

为了研究氧化还原过程对沉积物P流的贡献,在温和的硬水草原湖中.
量化沉积物P池和流量的季节性和湖泊特异性差异.
确定地质化学因素,特别是对这些湖泊系统中P循环的影响.

主要方法:

完好无损的沉积物核心季节性地从加拿大萨斯喀彻温省的温和硬水湖中收集.
在低氧和氧条件下进行实验室化,以测量沉积物P流.
进行了地球化学分析 (总P,有机P,有机物质,,Fe,Mn,Al) 和顺序分离.

主要成果:

沉积物P流在低氧条件下明显高于氧气条件.
在总P,有机P和离子度方面观察到季节性和湖泊特定的变化,其中Ca占主导地位.
氧化还原敏感池中的酸盐与沉积物P流相反,Ca度似乎取代了P流的氧化还原控制.

结论:

反氧化过程确实会影响硬水湖中的P流量,但它们的影响是由沉积物中高度的Ca调节的.
表面沉积物中的内部生成的有机P和有机物有助于内部P负荷.
在调节沉积物P动态方面发挥着重要作用,在这些草原湖中部分掩盖了氧化还原控制的影响.

关键词:

生物地化学过程生物地化学过程是一种这是一个P-NMR.沉积物 P 流量 P 的流量.沉积物 P 分数沉积物的核心是沉积物.

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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.

Primary Production

Primary Production

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.