Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
, 403 (6768), 421-4

Stimulation by Ammonium-Based Fertilizers of Methane Oxidation in Soil Around Rice Roots


Stimulation by Ammonium-Based Fertilizers of Methane Oxidation in Soil Around Rice Roots

P L Bodelier et al. Nature.


Methane is involved in a number of chemical and physical processes in the Earth's atmosphere, including global warming. Atmospheric methane originates mainly from biogenic sources, such as rice paddies and natural wetlands; the former account for at least 30% of the global annual emission of methane to the atmosphere. As an increase of rice production by 60% is the most appropriate way to sustain the estimated increase of the human population during the next three decades, intensified global fertilizer application will be necessary: but it is known that an increase of the commonly used ammonium-based fertilizers can enhance methane emission from rice agriculture. Approximately 10-30% of the methane produced by methanogens in rice paddies is consumed by methane-oxidizing bacteria associated with the roots of rice; these bacteria are generally thought to be inhibited by ammonium-based fertilizers, as was demonstrated for soils and sediments. In contrast, we show here that the activity and growth of such bacteria in the root zone of rice plants are stimulated after fertilization. Using a combination of radioactive fingerprinting and molecular biology techniques, we identify the bacteria responsible for this effect. We expect that our results will make necessary a re-evaluation of the link between fertilizer use and methane emissions, with effects on global warming studies.

Comment in

Similar articles

See all similar articles

Cited by 51 PubMed Central articles

See all "Cited by" articles

Publication types

LinkOut - more resources