Soils, a sink for N(2)O? A review

2007 | journal article. A publication with affiliation to the University of Göttingen.

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​Soils, a sink for N(2)O? A review​
Chapuis-Lardy, L.; Wrage, N.; Metay, A.; Chotte, J.-L. & Bernoux, M.​ (2007) 
Global Change Biology13(1) pp. 1​-17​.​ DOI: 

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Chapuis-Lardy, Lydie; Wrage, Nicole; Metay, Aurelie; Chotte, Jean-Luc; Bernoux, Martial
Soils are the main sources of the greenhouse gas nitrous oxide (N(2)O). The N(2)O emission at the soil surface is the result of production and consumption processes. So far, research has concentrated on net N(2)O production. However, in the literature, there are numerous reports of net negative fluxes of N(2)O, (i.e. fluxes from the atmosphere to the soil). Such fluxes are frequent and substantial and cannot simply be dismissed as experimental noise. Net N(2)O consumption has been measured under various conditions from the tropics to temperate areas, in natural and agricultural systems. Low mineral N and large moisture contents have sometimes been found to favour N(2)O consumption. This fits in with denitrification as the responsible process, reducing N(2)O to N(2). However, it has also been reported that nitrifiers consume N(2)O in nitrifier denitrification. A contribution of various processes could explain the wide range of conditions found to allow N(2)O consumption, ranging from low to high temperatures, wet to dry soils, and fertilized to unfertilized plots. Generally, conditions interfering with N(2)O diffusion in the soil seem to enhance N(2)O consumption. However, the factors regulating N(2)O consumption are not yet well understood and merit further study. Frequent literature reports of net N(2)O consumption suggest that a soil sink could help account for the current imbalance in estimated global budgets of N(2)O. Therefore, a systematic investigation into N(2)O consumption is necessary. This should concentrate on the organisms, reactions, and environmental factors involved.
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Global Change Biology 
Fakultät für Agrarwissenschaften ; Department für Nutzpflanzenwissenschaften ; Abteilung Graslandwissenschaft 



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