Article (Scientific journals)
Impact of tillage on greenhouse gas emissions by an agricultural crop and dynamics of N2O fluxes: Insights from automated closed chamber measurements
Lognoul, Margaux; Theodorakopoulos, Nicolas; Hiel, Marie-Pierre et al.
2017In Soil and Tillage Research, 167, p. 80-89
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Keywords :
nitrous oxide; carbon dioxide; tillage management
Abstract :
[en] Our experiment aimed at studying the impact of long term tillage treatments – reduced tillage (RT) and conventional tillage (CT), on CO2 and N2O emissions by soil and at describing the dynamics of N2O fluxes. Gas measurements were performed from June to October 2015 in a Belgian maize crop, with homemade automated closed chambers, allowing continuous measurement at a high temporal resolution. After 7 years of treatment, CO2 and N2O average emissions were significantly larger in the RT parcel than in the CT parcel. This observation was attributed to the effect of tillage on the distribution of crop residues within the soil profile, leading to higher soil organic C and total N contents and a greater microbial biomass in the upper layer in RT. A single N2O emission peak triggered by a sudden increase of water- filled pore space (WFPS) was observed in the beginning of the measuring campaign. The absence of large emission afterwards was most likely due to a decreasing availability of N as crop grew. N2O background fluxes showed to be significantly correlated to CO2 fluxes but not to WFPS, while the influence of soil temperature remained unclear. Our results question the suitability of reduced tillage as a “climate-smart” practice and suggest that more experiments be conducted on conservation practices and their potent negative effect on environment.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lognoul, Margaux ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Theodorakopoulos, Nicolas ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbiologie et génomique
Hiel, Marie-Pierre ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Phytotechnie des régions tempérées
Broux, François ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Regaert, Donat
Heinesch, Bernard  ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Bodson, Bernard ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Phytotechnie des régions tempérées
Vandenbol, Micheline ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbiologie et génomique
Aubinet, Marc ;  Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Ecosystèmes - Atmosphère
Language :
English
Title :
Impact of tillage on greenhouse gas emissions by an agricultural crop and dynamics of N2O fluxes: Insights from automated closed chamber measurements
Publication date :
April 2017
Journal title :
Soil and Tillage Research
ISSN :
0167-1987
eISSN :
1879-3444
Publisher :
Elsevier Science
Volume :
167
Pages :
80-89
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
AgriGES
Funders :
French Community of Belgium (No. ARC 13/17-11)
Available on ORBi :
since 08 December 2016

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