相关实验视频

Updated: Jul 16, 2025

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

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

Published on: March 6, 2014

如何在浅湖内形成内部营养负载:洞察地有机物矿化过程中的洞察力

Xiaolong Yao¹, Runnan Ding², Yongqiang Zhou¹

¹State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.

|September 13, 2023

概括

来自湖泊沉积物的内部营养物质加载推动了缩,特别是在藻类繁殖期间. 沉积物有机物和微生物过程显著推动营养释放,影响浅湖生态系统.

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:

内部营养物质负载是浅湖缩的主要驱动因素,特别是在外部负载减少后.
了解沉积物特性,微生物活动和营养物质释放之间的相互作用对于管理湖泊生态系统至关重要.
之前的研究已经量化了营养池,但缺乏关于基质,微生物过程和营养释放动态之间的具体联系的清晰度.

研究的目的:

研究沉积物有机物特征,微生物 (N) 转化和在浅湖中通过沉积物-水界面 (SWI) 的营养流之间的关系.
为了阐明沉积物物理化学参数,N转化速率和营养释放动态之间的因果关系.
评估沉积物N矿化对太湖藻类开花期间营养物质可用性的贡献.

主要方法:

使用光学测量对沉积物有机物进行表征.
通过稳定同位素 (¹⁵N) 稀释技术测量湖面沉积物的总转化.
使用连续流量方法化完整的沉积物核心,以测量 SWI 中的呼吸和营养流量.
应用部分最小平方路径模型来分析变量之间的因果关系.

主要成果:

影响转化速率的环境因素因季节而异,沉积物衍生的溶解有机物是夏季藻类开花期间的关键驱动因素.
沉积物有机物矿化对孔水营养度和随后在SWI的营养流量产生了显著的积极影响.
在总N矿化率和氨流量之间观察到强烈的正相关性,表明在N限期内从沉积物N矿化中获得大量的无机N供应.

结论:

沉积物有机物特性和微生物过程是浅湖内内部营养物质负载的基本驱动因素.
沉积物N矿化提供了重要的无机源,支持藻类繁殖,特别是在湖泊限期.
这项研究提供了对基板和微生物过程驱动的内部营养物质负载机制的关键见解,这对于有效的湖泊管理和恢复至关重要.

关键词:

总矿化总矿化内部负载内部负载太湖 (Taihu) 是一个湖泊.营养物流是营养物流的组成部分.沉积物沉积物是一种沉积物.

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

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential

Published on: April 20, 2012

相关概念视频

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.

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.

Microbial Nutrition

Microbial Nutrition

Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...

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.

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...