The reducing effect of aglime on N2O and CO2 emissions balance from an acidic soil: A study on intact soil cores

The functioning of the nitrous oxide (N2O) reductase enzyme involved in the last step of denitrification is pH sensitive, with an optimum of 6.8. A solution to mitigate N2O emissions would be to bring soil pH close to neutrality by adding agricultural liming products (aglime). Nevertheless, the infl...

Full description

Saved in:
Bibliographic Details
Published in:European journal of soil science 2023-03, Vol.74 (2), p.n/a
Main Authors: Rousset, Camille, Brefort, Henri, Arkoun, Mustapha, Mathieu, Olivier, Hénault, Catherine
Format: Article
Language:English
Subjects:
Acidic soils
Agricultural land
agricultural liming
Anaerobic conditions
Anoxic conditions
C stabilisation
Calcium
Calcium carbonate
Calcium carbonates
Carbon dioxide
Carbon dioxide emissions
Carbonates
Cores
Cylinders
Denitrification
DOC
Emissions
Emissions control
Farm buildings
Fruits
GHG balance
Greenhouse effect
Greenhouse gases
Hydroxyapatite
Leachates
Liming
Mineralization
Mitigation
Nitrous oxide
NO3−$$ {{\mathrm{NO}}_3}^{-}
Organic carbon
Organic soils
Reductases
Reduction
Sandy loam
Sandy soils
Soil
Soil chemistry
Soil pH
Soil properties
Soil stabilization
Soils
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The functioning of the nitrous oxide (N2O) reductase enzyme involved in the last step of denitrification is pH sensitive, with an optimum of 6.8. A solution to mitigate N2O emissions would be to bring soil pH close to neutrality by adding agricultural liming products (aglime). Nevertheless, the influence of aglime on the soil greenhouse gas (GHG) balance (CO2–N2O) is a subject of debate, particularly when considering the fate of the carbon (C) derived from carbonates. Our objective was to investigate the results of the effect of calcium carbonate (CaCO3) aglime on the CO2–N2O balance. Sixteen cylinders of undisturbed acidic soil were taken from a sandy loam profile and incubated at 20°C for 107 days in anaerobic conditions (water‐filled pore space >60%). Eight limed treatment cylinders received 1.45 g of aglime on the soil surface (2 t NV ha−1) and 0.08 g of N (100 kg of N ha−1). Eight control treatment cylinders received only 0.08 g of N. N2O and CO2 fluxes were measured and converted into CO2 equivalents to perform a GHG balance calculation. Furthermore, soil and leachate properties were measured. Aglime application triggered a reduction of N2O emissions, probably due to an increase in soil pH at the beginning of the experiment, which would have led to the N2O reductase activation. High NO3−$$ {{\mathrm{NO}}_3}^{-} $$‐N content in the soil may inhibit the high N2O reduction potential in the limed treatment. CO2 emissions were unexpectedly lower in the limed treatment. Aglime addition did not enhance C mineralisation, which may be explained by the possible stabilisation of soil organic carbon. A significant 11.3% reduction of GHG emissions was observed in the limed treatment. Overall, our results show that a strategy of liming acidic agricultural soil could be implemented for its potential in GHG mitigation. Nevertheless, future in‐depth research is necessary to better understand the fate of the C brought about by aglime.
ISSN:1351-0754
1365-2389
DOI:10.1111/ejss.13367