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Updated: Jun 14, 2025

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading

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沉积物池中的空间异质性和缩水库中的酶活性

Abagael N Pruitt¹, Kynser Wahwahsuck¹, Samantha G Thomas¹

¹Kansas Biological Survey-Center for Ecological Research, University of Kansas, Lawrence, Kansas, USA.

Journal of environmental quality

|August 30, 2024

概括

农业排放导致有害的藻类繁殖. 沉积物循环,受低氧和基本条件的影响,驱动内部负载和水库中的花.

科学领域:

环境科学环境科学
临界技术临界技术
生物地质化学生物地质化学

背景情况:

农业 (P) 输入导致水库中的化和有害藻类繁殖 (HABs).
储沉积物储存P,有助于内部P负荷并加剧HABs.
在水库沉积物中,P循环的空间和时间动态仍未得到充分研究.

研究的目的:

为了研究水库沉积物中P度和形式的时空变化.
了解控制P循环和沉积物内释放的过程.
将沉积物P动态与内部P负荷和HABs联系起来.

主要方法:

2018年8月和10月,在堪萨斯州米尔福德水库的30个地点进行现场采样.
分析水的化学成分,温度,溶解氧和pH值.
对P化学物种和酸酶活性进行沉积物分析.

主要成果:

酸酶活性,一个关键的P释放机制,在无氧和基本条件下更高.
低溶解氧水平与酸酶活性和沉积物P池正相关.
研究结果表明,低氧气在夏季推动内部P负荷和HAB.

结论:

了解沉积物P循环对于管理高性水库中的HAB至关重要.
沉积物的内部P负荷受到氧气可用性和pH值的显著影响.
这项研究增强了对中西部受农业影响的水库P动态的了解.

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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.