相关实验视频

Updated: Mar 17, 2026

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

Published on: October 29, 2016

地下水中酸盐在管理下层补充期间的演变:从DOM特征和稳定同位素的洞察力

Congchao Xu¹, Rui Li², Weiwu Hu³

¹School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, China.

Journal of hazardous materials

|March 15, 2026

概括

管理的含水层补充 (MAR) 改变了溶解有机物 (DOM) 的特性,影响了酸盐水平. 这项研究揭示了MAR如何通过改变DOM特征和微生物活动来改变酸盐平衡,改善地下水质量.

科学领域:

环境科学环境科学
水文地质学水文地质学
生物地质化学生物地质化学

背景情况:

管理的含水层补充 (MAR) 对地下水管理至关重要,但其通过溶解有机物 (DOM) 对酸盐动态的影响尚不清楚.
了解DOM变化是管理MAR系统中酸盐污染的关键.

研究的目的:

调查河流诱导的MAR如何影响DOM属性,从而影响酸盐的转化.
在MAR条件下阐明控制酸盐源-沉平衡的机制.
建立一个综合框架来分析DOM驱动的酸盐变化.

主要方法:

水化学分析的分析方法
超高分辨率的DOM分子特征 (FT-ICR-MS) 的研究.
稳定同位素分析 (碳和)
微生物社区分析
可以解释的机器学习

主要成果:

马尔增强了地下水和地表水的连接,增加了地下水位,溶解氧气,溶解有机碳和酸盐.
重充衍生的DOM显示了改变的特性 (较低的分子量,更高的O/C,N-丰富),提高了生物可用性.
马尔刺激酸盐的产生 (矿化,化) 和去除 (脱化),使酸盐系统重新平衡.
机器学习确定了影响酸盐转换的关键DOM分子参数 (NOSC,O/C比,分子质量).

结论:

马尔显著改变DOM特征,推动转向更高效的酸盐转化途径.
一个集成的DOM-微生物-同位素框架为MAR系统中的酸盐动态提供了新的见解.
结果为地下水质量监管和在管理充电操作中减轻污染提供了战略.

关键词:

溶解有机物 (DOM) 是一种有机物.地下水的地下水.同位素同位素是同位素.管理的水表填充 (MAR)亚酸盐是一种酸盐.

更多相关视频

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Published on: December 20, 2016

相关概念视频

Overview of Nitrogen Metabolism

Overview of Nitrogen Metabolism

Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...

Inorganic Nitrogen Assimilation

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...

Metabolism of Chemolithotrophs

Metabolism of Chemolithotrophs

Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.

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...