Soil Respiration Dynamics in Terrestrial Ecosystems

Soil respiration, the flux of carbon dioxide from the soil surface to the atmosphere, represents the second largest terrestrial carbon exchange after photosynthesis. It comprises two principal components: autotrophic respiration by plant roots and associated symbionts, and heterotrophic respiration by soil microbes decomposing organic matter. Rates of soil respiration vary widely in space and time, driven primarily by soil temperature, moisture, substrate availability and vegetation characteristics. Seasonal and diurnal fluctuations reflect the interplay between warming-induced enzymatic activity and moisture-mediated diffusion of gases. Over longer timescales, changes in land use, vegetation composition and climatic extremes can alter soil carbon stocks and microbial community structure, leading to feedbacks that may either amplify or dampen atmospheric warming. Accurate quantification of soil respiration dynamics is therefore essential for refining Earth system models, informing land-management strategies and improving carbon-cycle projections under future climate scenarios.

Research from Nature Portfolio

Recent studies have employed mechanistic models spanning lab, field and global scales to quantify how rising temperatures and changing soil moisture jointly influence heterotrophic respiration. These models indicate that microbial decomposition rates have increased by roughly 2% per decade since the 1980s and project up to a 40% global rise in heterotrophic emissions by 2100 under high-emission pathways, with polar regions exhibiting especially pronounced sensitivity driven by soil drying rather than temperature alone. In parallel, a synthesis of data-driven global soil respiration estimates reveals growing divergence among scaling approaches developed over the past two decades. This growing spread underscores the need to harmonise observational networks and modelling protocols to reduce uncertainty in carbon-flux predictions and to ensure more reliable inputs for climate-change assessments.

Soil Respiration Dynamics in Terrestrial Ecosystems publication trend

The graph below shows the total number of articles in soil respiration dynamics in terrestrial ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Soil respiration: The total flux of CO₂ from soil to atmosphere, combining root and microbial sources.

Heterotrophic respiration: CO₂ release resulting from microbial decomposition of soil organic matter.

Autotrophic respiration: CO₂ released by root metabolism and associated mycorrhizal activity.

Q₁₀: A coefficient quantifying the rate increase in respiration for each 10 °C rise in temperature.

Mechanistic model: A computational framework representing the biological and physical processes governing soil respiration.

References

1. Global warming accelerates soil heterotrophic respiration. Nature Communications (2023).
2. Divergent data-driven estimates of global soil respiration. Communications Earth & Environment (2023).
3. High-resolution carbon cycling data from 2019 to 2021 measured at six Austrian long-term ecosystem research sites. Earth System Science Data (2025).
4. Soil trenching – are microbial communities alike in experimental peatland plots measuring total and heterotrophic respiration?. Soil Biology and Biochemistry (2025).