Related Experiment Video
Updated: Jul 23, 2025
07:26
Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
Published on: January 31, 2025
369
Microbial carbon use efficiency in different ecosystems: A meta-analysis based on a biogeochemical equilibrium model
Peng He1, Yuntao Zhang2, Qirong Shen2
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Centre for Grassland Microbiome, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China.
Global Change Biology
|July 11, 2023
Summary
Grassland soils show higher microbial carbon use efficiency (CUE), indicating greater carbon sequestration potential. Microbial metabolism and soil properties like pH and temperature significantly influence CUE across ecosystems.
Area of Science:
- Soil science
- Microbial ecology
- Biogeochemistry
Background:
- Soil microbial carbon use efficiency (CUE) is vital for understanding carbon partitioning between microbial growth and respiration.
- General patterns of microbial CUE across terrestrial ecosystems remain controversial, necessitating further investigation.
Approach:
- Analyzed data from 41 sites (197 soil samples) across farmland, forest, and grassland ecosystems.
- Estimated microbial CUEs using a biogeochemical equilibrium model and evaluated metabolic limitations with an enzyme vector model.
- Investigated drivers of CUE, including exoenzyme stoichiometry, soil elemental stoichiometry, climate factors (MAT, MAP), and soil pH.
Key Points:
- Grassland soils exhibited significantly higher microbial CUE (0.42) compared to farmland (0.39) and forest (0.33) soils.
- Carbon limitation was a dominant metabolic constraint on CUE.
- Exoenzyme stoichiometry, particularly C:P and C:N acquisition ratios, significantly impacted CUE, with ecosystem-specific effects.
- Mean annual temperature (MAT) and soil pH were critical climate and soil factors influencing CUE.
Conclusions:
- Grassland soils possess higher microbial carbon sequestration potential.
- Resource constraints and microbial resource allocation patterns vary distinctly across terrestrial ecosystems.
- Findings provide a conceptual framework for microbial CUE and theoretical evidence for enhancing soil microbial carbon sequestration.
Keywords:
carbon use efficiencyextracellular enzyme stoichiometrymean annual temperaturemetabolic limitationsoil elemental stoichiometrysoil pHMore Related Videos
Related Concept Videos
01:30Environmental Applications of Microorganisms
63
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
63
01:28Microbial Nutrition
105
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...
105
01:15Metabolism of Chemolithotrophs
50
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.
50
00:46Trophic Efficiency
20.7K
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.
20.7K
01:28Carbon-dioxide Fixation
42
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
42
01:27Microbial Growth Measurement: Indirect Methods
79
Estimating microbial growth is essential for understanding population dynamics and environmental adaptations. Indirect methods provide valuable insights by measuring parameters such as turbidity, metabolic activity, and biomass, enabling efficient and reproducible assessments.During exponential growth, microbial cells scatter light proportionally to their biomass, a principle used in turbidity measurements. About one million cells per milliliter produce detectable scattering, which a...
79