相关实验视频

Updated: Jun 7, 2025

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

基于DOM和稳定同位素组合的源和转化过程的探索,以DOM和稳定同位素组合为基础

Xiujian Hu¹, Shengwei Cao¹, Mengtuo Wen²

¹Fujian Provincial Key Laboratory of Water Cycling and Eco-Geological Processes, Xiamen, Fujian 361021, China; Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, Hebei 050061, China.

Marine pollution bulletin

|November 15, 2024

概括

门湾的气来源主要是便和污水,影响了缩. 溶解有机物 (DOM) 影响转化,特别是在高流量时,有助于缓解策略.

科学领域:

环境化学环境化学
海洋生物地质化学海洋生物地质化学
河口生态学河口生态学

背景情况:

门湾面临着由于含量升高的越来越多的缩.
了解的来源和转化对于管理水质至关重要.

研究的目的:

确定门湾的主要源及其转化.
研究溶解有机物 (DOM) 和酸盐稳定同位素在河口循环中的作用.
为减轻环保化的减缓策略提供科学基础.

主要方法:

对酸盐稳定同位素 (δ15N-NO3− 和 δ18O-NO3−) 的分析.
溶解有机物 (DOM) 的量化.
应用贝叶斯混合模型 (MixSIAR) 来识别源.

主要成果:

门湾的酸盐来源主要是便和污水,大气沉积是次要来源.
在低盐度区域,酸盐受淡水和海水混合和生物地化学过程的影响;在高盐度区域,物理混合占主导地位.
溶解有机物 (DOM) 在的转化和释放中起着重要作用,特别是在高流量期间.

结论:

便和污水是丰富和化在门湾的主要驱动因素.
对于理解河口环境中的循环和环保化过程,DOM动态至关重要.
这些发现为有针对性的管理干预提供了基础,以减少门湾的肥胖化.

关键词:

贝叶斯模型是贝叶斯模型.生物地化学过程生物地化学过程溶解有机物 (DOM) 是一种有机物.亚酸盐是同位素的同位素.气循环是指气循环的过程.

更多相关视频

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

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

相关概念视频

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...

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...

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.

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.

What are Biogeochemical Cycles?

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.