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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Forest soils can remove methane from the atmosphere, and a 24-year record from 13 beech and spruce plots in southwest Germany found that this uptake increased by about 3% per year. The sites became warmer and drier during the monitoring period. That combination may have helped methane diffuse into the soil and allowed methane-oxidizing microbes to consume it faster. The result is a regional observational trend—not proof that climate change will increase methane uptake in every forest.
What the long-term study found
The study, published in Agricultural and Forest Meteorology in 2025, analyzed soil-gas measurements from the Forest Research Institute Baden-Württemberg monitoring programme. Researchers followed 13 forest soils in southwest Germany for periods lasting up to 24 years.
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Across the monitored sites, mean annual methane uptake was 1.40 ± 1.29 nanomoles per square metre per second. Individual site averages ranged from 0.55 to 3.31 nanomoles per square metre per second. Trend analysis showed an average 3% annual increase in methane uptake over the observation periods (Lang et al., 2025).
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThese soils are methane sinks: atmospheric methane moves into the soil, where microorganisms oxidize it and convert it primarily into carbon dioxide and water. The study measured methane removal from soil, not total forest carbon sequestration, tree growth or the complete greenhouse-gas balance of the forests.
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Why drying and warming could increase methane removal
Drier soil leaves more connected air space
Atmospheric methane reaches methane-oxidizing microbes by diffusing through soil pores. When soil contains less water, a greater share of its pore space is filled with air. That can make it easier for methane to move downward from the atmosphere to the zones where the microbes live. Excessively wet soil can slow gas diffusion because methane moves much more slowly through water than through air.
Warmer conditions may speed microbial oxidation
Temperature can affect the activity of methane-oxidizing microorganisms. Within the range experienced by these sites, warmer soil may have increased the rate at which microbes consumed methane after it entered the soil. The authors identify warming and drying as the most plausible explanation for the observed trend, rather than as a universal rule for all ecosystems.
Annual precipitation and measured soil moisture declined in the German record while soil temperature rose. The methane trend therefore coincided with a local shift toward conditions that can favor atmospheric methane entry and oxidation.
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How the researchers measured methane uptake
The team used repeated soil-gas profiles rather than relying only on occasional surface measurements. Thin tubes installed at several soil depths allowed air samples to be withdrawn over many years. Methane concentrations at different depths were used to calculate how quickly the gas moved through the soil and was consumed.
The profile-based estimates were independently checked with chamber measurements. For a chamber measurement, researchers placed an airtight chamber on the soil surface and tracked the change in methane concentration inside it. Agreement between the two approaches provided a check on the long-term flux calculations.
- Sample the soil atmosphere: withdraw gas through tubes positioned at multiple depths.
- Build concentration profiles: compare methane concentrations from the different depths.
- Estimate the flux: calculate the downward movement and microbial consumption of atmospheric methane.
- Validate with chambers: seal a chamber over the soil and measure the resulting methane concentration change.
- Analyze the time series: test whether annual uptake changed across monitoring periods of up to 24 years.
How much methane did the forest soils absorb?
| Measure | Reported value | What it represents |
|---|---|---|
| Mean annual uptake | 1.40 ± 1.29 nmol m−2 s−1 | Average atmospheric methane flux across the monitored soils |
| Site range | 0.55–3.31 nmol m−2 s−1 | Variation among the 13 forest plots |
| Long-term trend | About 3% more uptake per year | Average increase during each site’s monitoring record |
| Study area | 13 beech and spruce plots | Forest soils in southwest Germany |
| Monitoring duration | Up to 24 years | Repeated field observations, not a short-term experiment |
The relatively large spread around the mean and the wide site range show that individual forests behaved differently. A regional average should not be read as the uptake rate of every beech, spruce or mixed forest.
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Does the study show that climate change can help forests?
It shows that climate change-related conditions coincided with increased methane uptake at these German sites. Professor Martin Maier of the University of Göttingen said the long-term data show that climate change “does not necessarily have a negative impact on how much methane forest soils absorb.”
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That statement concerns one methane process under one set of local conditions. The study did not demonstrate that warming benefits forests overall. Heat and drought can stress trees, raise wildfire risk, alter nutrient cycling and reduce growth, even if a particular soil temporarily removes methane more efficiently. Nor did the study measure whether the additional methane uptake outweighed other climate-related greenhouse-gas changes.
Why the finding cannot be generalized to every forest
Rainfall patterns can reverse the direction
International studies have reported declining forest-soil methane uptake under wetter conditions. If rainfall increases or soils remain saturated, reduced air-filled pore space can restrict methane diffusion and lower oxidation. A drying trend in southwest Germany does not predict the response of a rainforest, a peat-influenced forest, a high-latitude stand or a site receiving more precipitation.
Forest type and soil properties differ
The dataset covered beech and spruce plots in one region. Soil texture, organic-matter content, pore structure, acidity, microbial communities, vegetation and snow cover can all affect methane transport and oxidation. Those differences make site-specific measurements essential.
Observation is not experimental proof
The researchers observed long-term changes and tested whether they tracked climate variables; they did not experimentally warm or dry matched forest plots. The proposed mechanism is physically plausible and consistent with the measurements, but the record cannot isolate every possible cause or establish that the same 3% annual trend would occur elsewhere.
What the result means for climate accounting
Forest soils are a natural methane sink, so changes in their uptake matter for atmospheric methane budgets. The German record demonstrates why short measurement campaigns can miss slow, directional changes. Long-running soil-gas programmes can reveal whether a site is becoming a stronger or weaker methane sink as hydrology and temperature shift.
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For climate models and inventories, the practical lesson is to represent soil moisture, precipitation trends and regional forest characteristics rather than apply one global methane-uptake response. For land managers, the study is evidence to monitor soil gases alongside moisture, temperature and other ecosystem indicators—not a reason to assume that drought is beneficial.
The clearest takeaway
At 13 southwest German forest plots, atmospheric methane uptake rose roughly 3% per year during as much as 24 years of measurements. Declining soil moisture and rising temperature are the authors’ proposed explanation: drier pores improved methane diffusion, while warmer conditions may have accelerated microbial oxidation. Because the evidence is regional, observational and highly variable among sites, it should be treated as a valuable local climate response—not a forecast that forests everywhere will absorb more methane.
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