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May 22, 2025

Scientists develop automated system to monitor methane absorption in forest soils

Seasonal variations in atmospheric and soil temperature, soil moisture and daily precipitation, and soil methane uptake. Credit: Liu Yuqi
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Seasonal variations in atmospheric and soil temperature, soil moisture and daily precipitation, and soil methane uptake. Credit: Liu Yuqi

Scientists from the Institute of Applied Ecology of the Chinese Academy of Sciences have developed an automated monitoring system to continuously track methane absorption by forest soils. A four-year study at a temperate forest site revealed a strong correlation between soil temperature, moisture, and methane uptake rates, enhancing understanding of methane oxidation dynamics.

Methane (CH4) is a potent greenhouse gas with a global warming potential 28 to 34 times greater than (CO2) over a century. Forest soils serve as a major biological sink for , naturally removing it through a process called methane oxidation. This process is carried out by methanotrophic bacteria in the soil, which utilize methane as an energy source.

Traditional methods of measuring methane uptake, often involving infrequent manual sampling, may not capture the rapid changes in environmental conditions such as rainfall, limiting the ability to fully capture how soil temperature and moisture affect methanotrophic activity.

To overcome this, the researchers led by Professor Fang Yunting established an automated monitoring system at the Qingyuan National Forest Ecosystem Research Station, conducting continuous measurements over four years.

The study, in the journal Agricultural and Forest Meteorology, showed that the forest soil consistently acted as a methane sink, absorbing an average of 5.24 kilograms of methane-carbon per hectare per year. The rate of methane absorption varied seasonally, peaking in the summer at 244 micrograms of carbon per square meter per hour and decreasing to a low of 0.8 micrograms of carbon per square meter per hour in the winter.

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Analysis shows that methane absorption in these soils is primarily controlled by soil temperature and moisture. While the abundance of methane-oxidizing bacteria and soil also play a role, simple linear regression models showed that soil temperature alone explained 36% of the variability in methane uptake, and accounted for 56%. A dual-factor model considering both temperature and water-filled pore space (Temp-WFPS) explained 86% of the annual variation in methane uptake.

The researchers also found that traditional monthly sampling can bias annual methane absorption by up to 19%. The high-frequency monitoring provides detailed daily, seasonal, and annual measurements of methane absorption and its response to changing environmental factors, offering valuable insights into the regulatory mechanisms of and moisture on methane uptake.

This advancement aids the refinement of biogeochemical models and improves global budget estimates, providing essential knowledge for climate change mitigation efforts.

More information: Yuqi Liu et al, Temperature and moisture both control net methane uptake in a temperate forest soil, Agricultural and Forest Meteorology (2025).

Journal information: Agricultural and Forest Meteorology

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An automated system for continuous monitoring of methane (CH4) absorption in forest soils demonstrated that soil temperature and moisture are the primary factors controlling methane uptake, with a dual-factor model explaining 86% of annual variation. High-frequency data revealed seasonal patterns and showed that traditional sampling can significantly underestimate methane absorption, improving accuracy in methane budget estimates.

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