Mise en place d’un système de mesure par covariance de turbulence des flux de N2O sur une parcelle agricole

Nitrous oxide (N2O) is a greenhouse gas responsible for 8% of anthropogenic radiative forcing. It is also a major contributor to stratospheric ozone depletion. Agricultural soils represent its main source. N2O is produced by microorganisms through nitrification and denitrification processes. Both depend on oxygenation conditions and nitrogen and labile carbon availability, which are driven by soil and climate conditions and by farming practices. Yet there remain science gaps concerning the understanding of emission mechanisms and dynamics. The eddy covariance technique allows studying a whole ecosystem with a half-hourly temporal resolution, opening up for long-term monitoring and precise greenhouse gas budget calculation. However, this technique requires a specific expertise. In order to install such a system to measure N2O exchanges by a production crop at the Terrestrial Observatory of Lonzée (Belgium), we set the following goals : (1) establishing the state of knowledge concerning N2O fluxes exchanged by crops and identifying gaps, (2) setting up a N2O analyzer at the experimental site and providing operating procedures, and (3) building and adjusting the first data processing and calculation procedures. As a result of this work, scientific gaps were identified and avenues for further research are suggested. Monitoring and data acquisition routines as well as first data processing procedures were implemented. Numerous questions still remain regarding the adaptation of classical methods (created to study CO2) to N2O, and they constitute the investigation prospects of this work.

Grantor dc:publisher

ULiège - Université de Liège

Year dc:date

2015

Author dc:creator

• Lognoul, Margaux

Contributors dc:contributor

• Aubinet, Marc

• Nitrous oxide
• Production crops
• Eddy covariance
• Quantum cascade laser analyzer
• Protoxyde d'azote
• Cultures de production
• Covariance de turbulence
• Analyseur laser à cascade quantique
• Physical, chemical, mathematical & earth Sciences
• Earth sciences & physical geography
• Physique, chimie, mathématiques & sciences de la terre
• Sciences de la terre & géographie physique

Statement dc:rights

• open access
• info:eu-repo/semantics/openAccess

Licence

• http://purl.org/coar/access_right/c_abf2

Language dc:language

fr

Identifier

info:hdl:2268/187886

OAI identifier oai:identifier

oai:orbi.ulg.ac.be:2268/187886