使用效率是海洋初级生产跨生态系统变化的基础
Francis Chan1,2, Karina J Nielsen3,4, Jane Lubchenco3
1Department of Integrative Biology, Oregon State University, Corvallis, OR, 97331, USA. francis.chan@oregonstate.edu.
Scientific reports
|December 31, 2024
概括
利用效率 (NUE) 显著影响海洋生态系统的生产力. 这项研究表明,NUE的变化是由生态系统层面的分布驱动的,而不是生物层面的差异,影响全球初级生产.
科学领域:
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 海洋生态系统的生产力基本上是由 (N) 供应和植物浮游生物N使用效率 (NUE) 控制的.
- 了解NUE在不同的海洋系统中如何变化至关重要,因为NUE的变化可以将初级生产与NUE供应脱.
- 目前对NUE的全球变化及其对海洋生产力的影响的了解有限.
研究的目的:
- 调查海洋生态系统中使用效率 (NUE) 的全球变化.
- 确定总 (TN) 在不同池中的分配如何影响初级生产.
- 建立对海洋生产力的预测关系,以应对未来的气供应干扰.
主要方法:
- 全球综合总 (TN) 在植物浮游生物,颗粒物,溶解无机和溶解有机池中的分布.
- 分析生态系统层面的分布变化,以了解NUE变化.
- 开发一个预测方程,将甲 (chla) 度与生态系统N池大小相关联.
主要成果:
- 利用效率 (NUE) 解释了海洋初级生产的显著差异.
- 植物浮游生物质 (叶绿素-a) 与生态系统池大小 (chla = 0.004*TN^2.38) 不线性地扩大,解释了68%的差异.
- NUE的变化源于生态系统层面的分布,特别是植物浮游生物和溶解的有机N池之间,而不是生物层面的差异.
结论:
- 生态系统层面的分布变化,影响NUE,调节长期海洋储量.
- NUE的变化提供了反机制,影响了海洋表面的留量.
- 在NUE中的全球模式为预测未来气供应场景下的海洋生产率变化提供了一个框架.
相关概念视频
Primary Production
23.5K
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.
23.5K
Production Efficiency
16.7K
Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
16.7K
Trophic Efficiency
20.3K
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
20.3K
The Nitrogen Cycle
51.6K
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...
51.6K
Overview of Nitrogen Metabolism
7.8K
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...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.8K
Metabolism of Chemolithotrophs
1
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.
1


