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关于Phoslock对沉积物-水界面上的气迁移的影响机制的研究

Penglong Wang^1,2,3, Jiehua Wang^1,2,3, Songwei Zhang^1,2,3

¹College of Geographical Sciences, Faculty of Geographical Science and Engineering, Henan University, Zhengzhou, 450046, China. xlbai@vip.henu.edu.cn.

Environmental science. Processes & impacts

|April 28, 2025

概括

锁的应用增加了上层水中的生物可用酸盐- (NO3−-N),但减少了沉积物-水界面上的氨- (NH4+-N) 扩散. 这表明Phoslock处理可以导致沉积物中的积累.

科学领域:

环境化学环境化学
水生生态系统水生生态系统
临界技术临界技术

背景情况:

锁被广泛用于水生环境中的调节.
它对沉积物-水界面 (SWI) 的 (N) 迁移的影响尚不清楚.
了解气动力学对于管理高化至关重要.

研究的目的:

调查斯洛克对SWI中酸盐- (NO3−-N) 和- (NH4+-N) 迁移的影响.
为了在不同温度和溶解氧条件下评估这些效应.
为了确定Phoslock对沉积物中循环功能基因的影响.

主要方法:

使用DGT (薄膜扩散梯度) 和Rhizon采样器来测量SWI的物种.
在控制温度 (15°C和30°C) 和有氧/无氧条件下在湖和李湖进行实验.
分析了氨氧化古生物 (AOA) 和细菌 (AOB) 功能基因的丰富性.

主要成果:

斯洛克在30°C时显著增加了上层水中的生物可用NO3−-N,增强了向下扩散.
斯洛克减少了生物可用的NH4+-N的向上扩散流,在较低的温度下具有更强的效果.
斯洛克降低了化基因丰富度 (AOA,AOB) 并将平衡转向沉积物中NO3−-N补充.

结论:

锁改变了SWI的迁移动态,促进了NO3−-N在上层水域的积累和NH4+-N在沉积物中的保留.
温度对NH4+-N的依赖性影响表明Phoslock在管理中的有效性因季节而异.
斯洛克对循环功能基因的影响表明化过程的潜在改变.

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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.

The Nitrogen Cycle

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...