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相关概念视频

Primary Production01:06

Primary Production

25.8K
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.
25.8K
Production Efficiency01:01

Production Efficiency

18.9K
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).
18.9K
Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

680
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...
680
Metabolism of Chemolithotrophs01:15

Metabolism of Chemolithotrophs

1.0K
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.
1.0K
The Nitrogen Cycle01:49

The Nitrogen Cycle

61.0K
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...
61.0K
Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

11.9K
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...
11.9K

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相关实验视频

Updated: Mar 3, 2026

Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management
05:04

Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management

Published on: July 14, 2023

815

和度和生态系统生产净值

An De Schrijver1, Kris Verheyen, Jan Mertens

  • 1Laboratory of Forestry, Ghent University, Geraardsbergse Steenweg 267, 9090 Gontrode, Belgium. An.Deschrijver@Ugent.be

Nature
|February 15, 2008
PubMed
概括

森林因沉积而封存碳,没有观察到和的迹象. 然而,生态系统净产量不是度和的可靠指标.

科学领域:

  • 森林生态 森林生态
  • 生物地质化学生物地质化学
  • 环境科学 环境科学

背景情况:

  • 温带和北极森林的净碳封存受到沉积的显著影响.
  • 之前的研究表明,由于输入增加,生态系统度和的潜在风险很大.

更多相关视频

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

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

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相关实验视频

Last Updated: Mar 3, 2026

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Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management

Published on: July 14, 2023

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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

Published on: December 16, 2022

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The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations
10:11

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

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