1. Hysteretic response of N2O reductase activity to soil pH variations after application of lime to an acidic agricultural soil.
- Author
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Ouerghi, Iheb, Rousset, Camille, Bizouard, Florian, Brefort, Henri, Ubertosi, Marjorie, Arkoun, Mustapha, and Hénault, Catherine
- Subjects
LIMING of soils ,SOIL acidity ,OZONE layer depletion ,ACID soils ,GREENHOUSE effect ,SOIL solutions - Abstract
N
2 O contributes to increasing the greenhouse effect and is also involved in stratospheric ozone depletion. In soil and water, N2 O reductase catalyses the reduction of N2 O into the inert form N2 . N2 O reductase activity is known to be affected by acidic conditions and the application of liming materials to acidic soils is now proposed as a solution for mitigating soil N2 O emissions. During a one-year laboratory experiment, we studied the functioning of N2 O reductase after the application of calcium carbonates to an acidic soil with a very low capacity to reduce N2 O. The functioning of N2 O reductase was characterised through anaerobic incubations using the acetylene inhibition technique combined with a logistic model to determine the main enzyme functioning characteristics (latency, maximal rate). Both changes in soil pH and soil capacity to reduce N2 O were rapidly observed after the application of lime materials. The activity of N2 O reductase was observed to be efficient throughout the experiment even when the soil had returned to initial acidic conditions, revealing a hysteretic response of N2 O reductase to pH variations. Nevertheless, some signs of lower N2 O reductase activity over time were observed mainly after 200 days of applying lime materials. Altogether, these results suggest that, in this soil condition, the beneficial impact of the application of liming materials on N2 O emissions could last longer than this on soil pH. [ABSTRACT FROM AUTHOR]- Published
- 2023
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