Draining peatlands gives global rise to laughing-gas emissions

Drained fertile peatlands around the globe are hotspots for the atmospheric emission of laughing-gas - a powerful greenhouse gas called nitrous oxide, which is partly responsible for global warming and destruction of the ozone layer, a new study shows.

Research into natural peatlands such as fens, swamps and bogs, as well as drained peatlands, found that either draining wet soils or irrigating well drained soils boosts the emission of nitrous oxide significantly.

Led by researchers at the University of Tartu, Estonia and the University of Birmingham and the University of Tartu, Estonia, the study took in 58 peatland sites around the world. These included locations in the United States, Australia, Brazil, South America, Australia, New Zealand, East Africa, Southeast Asia, Siberia and Europe.

The authors of the study - published in Nature Communications - are calling for increased conservation of fens and swamps to help reduce the impact of climate change and protect the ozone layer.

Prof Ulo Mander, Senior Lecturer in Biogeochemistry, at the University of Tartu, who conceived this research with a global network of 36 scientists said: "Nitrous oxide is no laughing matter - it is a significant contributor to global climate change and depletion of the ozone layer, which protects our planet from cosmic radiation.

"Organic soils, such as fens, swamps, bogs and drained peatlands, make up more than one-tenth of the world's soil nitrogen pool and are a significant global source of laughing gas. They are significant sources of nitrous oxide when drained for cultivation."

Dr Sami Ullah, Senior Lecturer in Biogeochemistry at the University of Birmingham added that this potential problem was further exacerbated when drained cultivated organic soils are irrigated, particularly in warm/tropical regions, which significantly increases nitrous oxide emission.

The report's lead author Dr. Jaan Parn is a joint exchange postdoctoral fellow at the University of Birmingham working under with Dr. Ullah and Prof. Mander's supervision.

"Our findings show that artificial drainage will be the primary driver of future changes in laughing gas emission from organic soils," he explained. "This effect will be more pronounced in tropical regions leading to more nitrous oxide emitted to the atmosphere. "Therefore, conservation and restoration of tropical fens and swamp forests should be made a priority to avoid and reduce emissions of this grim laughing gas."

Dr. Jaan Parn added that predicting soil response to changes in climate or land use was central to understanding and managing nitrous oxide emission.

Previous studies have suggested multiple factors of nitrous oxide emission without a clear global pattern for the prediction of nitrous oxide emission from organic soils. A work group of 37 experts from 24 research institutions conducted a global field survey of nitrous oxide emissions and potential driving factors across a wide range of organic soils in 58 sites around the world.

The survey found that changes in nitrous oxide levels flux emission can be predicted by models incorporating soil nitrate concentration, water content and temperature.

Nitrous oxide emissions increase with nitrate and follow a bell-shaped distribution peaking at intermediate soil moisture content around 50%. Both nitrate and soil moisture together explains 72% of laughing gas emission from the global organic soils.

Research paper

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