Fungi and Climate Change: 24-Year Study Reveals Surprising Climate Benefit Beneath Forests

Fungi and Climate Change: An Unexpected Finding from 24 Years of Forest Soil Research

Fungi and climate change are often discussed in connection with declining species, shifting seasons, and stressed forests. But a recent long-term study now provides a surprising counterpoint: some forest soils appear to be getting better at removing the greenhouse gas methane from the atmosphere as temperatures rise and precipitation decreases. The results, based on an observation series spanning up to 24 years, were communicated via ScienceDaily in October 2026 and challenge previous assumptions about the climate impact of forests. This is relevant for fungal research because soil microorganisms, above all fungi and bacteria, play a central role in the methane cycle. The following article summarizes the report, places it in the context of fungi and climate change, and shows which uncertainties remain.

What the Study Found: Methane Uptake Rises by an Average of Three Percent per Year

The study examined forest soils over a period of up to 24 years and found that methane uptake increased by an average of about three percent per year. This trend contradicts earlier forecasts that had assumed a declining or stagnating sink function of forest soils under warmer and drier conditions. Particularly noteworthy: the increase in methane absorption occurred precisely where temperatures rose and precipitation declined. The researchers suspect that changed soil conditions, such as lower water saturation and a shift in microbial communities, could contribute. Methane in the soil is primarily oxidized by specialized bacteria, the methanotrophic microorganisms. These bacteria apparently benefit from drier, better-aerated soils, while other processes, such as methane production by archaea, could decline. Fungi are not directly involved in methane oxidation, but they shape soil structure, water distribution, and competitive relationships, and thus indirectly the living conditions of methanotrophic bacteria.

The results are to be understood as a summary of the original report. The full study is accessible via the source linked below. It is important that this is an average trend: not every forest soil behaves the same, and the measurements come from specific regions and soil types. Transferability to all forests worldwide is therefore limited. Nevertheless, the study provides an important indication that the climate impact of forest soils is more complex than previously assumed.

Fungi Climate Change: Why Mycorrhiza and Soil Fungi Matter for the Methane Cycle

Even though methanotrophic bacteria carry out the actual methane oxidation, fungi are climate-change-relevant actors in the soil. Mycorrhizal fungi, which live in symbiosis with most tree species, alter soil structure, aeration, and the distribution of water and nutrients. A denser fungal network can promote the formation of stable soil aggregates and thus create pore spaces that are favorable for methanotrophic bacteria. At the same time, fungi and bacteria compete for resources, and the composition of the microbial community determines how much methane is actually oxidized. Studies on mycorrhiza also show that drought can change the symbiosis: some fungal partners become more stress-prone, others benefit from changed conditions. The new long-term study suggests that drier soils can favor methane uptake, but that does not mean forests as a whole benefit from climate change. Because the same dry conditions put pressure on many fungal species, shift fruiting body times, and change species composition.

In practice, this means: anyone observing fungi should not only pay attention to fruiting bodies but also to the soil as a whole. The FungiFind app offers a way to document finds and make spatial patterns visible with the FungiFind mushroom map. In this way, users can help record changes in fungal distribution over the long term. In addition, the FungiFind Blog provides background on ecological connections, and the FungiFind species encyclopedia contains profiles of numerous species, including the green-cracking russula (Russula virescens). This species is an example of how climate change can influence occurrence: it prefers rather mild, moist deciduous forests, and drier summers could delay or regionally limit its fruiting body formation. Further information on the species can also be found in the Wikipedia entry on the green-cracking russula.

Phenology, Drought, and Heavy Rain: What Mushroom Foragers and Researchers Observe

The long-term study on methane uptake is embedded in a larger picture: climate change is altering the phenology of fungi. Spring and autumn fungi sometimes appear earlier or later, and fruiting windows shift. In some regions, mild winters and wet autumns lead to a prolonged season, while drought periods cause fruiting body formation to fail entirely. Heavy rain, in turn, can compact soils and reduce oxygen supply in the soil, which impairs methanotrophic bacteria and stresses fungal mycelia. The new study shows that methane uptake increased on average, but it does not show how extreme weather events affect it in the long term. Research is needed here. For mushroom mapping, this means: find data should always be considered in connection with weather data. The FungiFind weather score and the season model help assess favorable conditions for fungal growth and document one's own observation. This creates a differentiated picture that takes both dry and wet years into account.

Distribution Shifts and Carbon Storage: What the Study Does Not Show

The study demonstrates increased methane uptake, but not a general improvement in the climate balance of forests. Forests store carbon in biomass and soils, and fungi are involved in the decomposition of organic matter. A warmer, drier soil can slow down or accelerate decomposition, depending on local conditions. The researchers emphasize that their results challenge earlier assumptions but do not allow a forecast for the future. Uncertainties exist, for example, regarding the durability of the trend, the role of different tree species, and the interaction with nitrogen inputs. For mushroom enthusiasts, this means: the report is an interesting piece of the puzzle, but not a free pass. The protection of forests and soils remains important, and the observation of fungi can help detect changes early. Anyone collecting mushrooms should always note: the information in this article is for informational purposes and does not replace on-site mushroom consultation. Approval for consumption may only be given by experienced experts.

Conclusion: A Differentiated View of Fungi and Climate Change

The 24-year study shows that forest soils can absorb more methane under warmer and drier conditions. For fungal research, this is an occasion to consider the complex interactions between fungi, bacteria, and soil. Fungi climate change is not a simple topic: there are winners and losers, and the direction depends on many factors. Anyone interested in fungi can use the FungiFind app and the species encyclopedia to help collect data and make changes visible. The original source for the study is linked below. Further information on fungi and climate change can be found in the FungiFind Blog.

Sources

• ScienceDaily: A 24-year study uncovers a surprising climate benefit beneath forests (October 2026), https://www.sciencedaily.com/releases/2026/10/261014015525.htm
• Wikipedia: Green-cracking russula, https://de.wikipedia.org/wiki/Russula_virescens

Note: This article summarizes an external report and supplements it with our own assessments. It serves informational purposes and does not replace on-site mushroom consultation.