Carbon Dynamics and Greenhouse Gas Emissions in Forest Ecosystems

Forests play a pivotal role in the global carbon cycle by capturing atmospheric carbon dioxide through photosynthesis and storing it in living biomass, dead organic matter and soils. Carbon dynamics in these ecosystems are governed by the balance between carbon uptake via net primary productivity and carbon release through respiration, decomposition and disturbance events such as fire and logging. Beyond carbon dioxide, forests exchange methane and nitrous oxide, two potent greenhouse gases, via microbial processes in soils and tissues, as well as through plant-mediated pathways in stems and foliage. Spatial variation in climate, soil moisture and nutrient availability influences these fluxes, while land-use change and ecological restoration efforts alter the trajectory of carbon sinks and sources. Understanding the interplay of biotic and abiotic drivers underpins accurate predictions of forest feedbacks to climate change and informs management strategies aimed at maximising carbon sequestration and mitigating greenhouse gas emissions.

Research from Nature Portfolio

Recent studies have revealed that upland tropical, temperate and boreal trees can act as net methane sinks by hosting methanotrophic communities on woody surfaces above the forest floor. By combining in situ measurements with laser scanning allometry, researchers estimate that global tree stems may consume 25–50 Tg of atmospheric CH₄ annually, underscoring an overlooked benefit of forest conservation. A parallel meta-analysis of restoration projects demonstrates that afforestation and reforestation sites transition from net CO₂ sources to sinks within 3–5 years, while wetland rewetting accelerates methane emissions but ultimately reduces overall global warming potential by enhancing soil carbon uptake. Complementary work in Arctic regions shows that well-drained permafrost soils may increase methane consumption under drier conditions and higher ecosystem respiration, suggesting a potential negative feedback to warming in high-latitude landscapes.

Carbon Dynamics and Greenhouse Gas Emissions in Forest Ecosystems publication trend

The graph below shows the total number of articles in carbon dynamics and greenhouse gas emissions in forest ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Net primary productivity (NPP): The rate at which plants synthesise organic carbon via photosynthesis minus their own respiratory losses.

Net ecosystem exchange (NEE): The difference between total ecosystem carbon uptake and total carbon release, indicating whether an ecosystem is a net carbon sink or source.

Methanotrophy: The microbial oxidation of methane to carbon dioxide, serving as a biological sink for atmospheric CH₄ in soils and on plant surfaces.

Allometry: The mathematical relationship used to estimate tree or woody surface area from easily measured dimensions such as diameter and height.

Global warming potential (GWP): A metric that compares the cumulative radiative forcing of different greenhouse gases to that of CO₂ over a specified time frame.

References

1. Global atmospheric methane uptake by upland tree woody surfaces. Nature (2024).
2. Meta-analysis shows the impacts of ecological restoration on greenhouse gas emissions. Nature Communications (2024).
3. Arctic soil methane sink increases with drier conditions and higher ecosystem respiration. Nature Climate Change (2023).
4. Methane and nitrous oxide budget for Chinese natural terrestrial ecosystems. National Science Review (2025).
5. The hidden roots of wetland methane emissions. Global Change Biology (2024).
6. Radiation and temperature drive diurnal variation of aerobic methane emissions from Scots pine canopy. Proceedings of the National Academy of Sciences of the United States of America (2023).