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Carbon balance of a grazed pasture and its response to grazing management
Jerome, Elisabeth; Gourlez de la Motte, Louis; Beckers, Yves et al.
20141st ICOS International Conference on Greenhouse Gases and Biogeochemical Cycles
 

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Keywords :
grazing; pasture; carbon; management; carbon balance
Abstract :
[en] The C balance of a grazed pasture situated in Condroz (Wallonia) and its dependence on climatic conditions and grazing management were investigated on the basis of eddy covariance measurements and horizontal C flow estimates. In average on three years, NEE was +43±24 gCm-2yr-1 and NBP was +7±26 gCm-2yr-1, suggesting that that the site is C neutral. Management by the farmer (organic fertilization), but also climate conditions influencing management (feed supplements), were the main factors impacting the C balance inter-annual variability. At a daily and seasonal scale, grazing impact on CO2 fluxes did not appear explicitly, being blurred by flux response to climate drivers. It was highlighted by specific investigations. The indirect grazing impact (photosynthesizing biomass consumption, excretions, soil compaction) was deduced from an analysis of the flux to PPFD response evolution during grazing period; the direct impact (livestock respiration) was investigated through confinement experiments. Result showed that saturation GPP changes were negatively correlated to grazing intensity (product of the stocking rate and grazing duration). On the contrary, no significant change in TER was observed. The direct impact of grazing due to cattle respiration was estimated to 2.59±0.58 kgCLU-1day-1, i.e. 8% of the TER.
Disciplines :
Environmental sciences & ecology
Agriculture & agronomy
Author, co-author :
Jerome, Elisabeth ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Echanges écosystèmes atmopshère
Gourlez de la Motte, Louis ;  Université de Liège - ULiège > Sciences agronomiques > Statistique, Echanges écosystèmes atmosphère
Beckers, Yves  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Bodson, Bernard ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Moureaux, Christine ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Aubinet, Marc ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Echanges écosystèmes atmosphère
Language :
English
Title :
Carbon balance of a grazed pasture and its response to grazing management
Publication date :
24 September 2014
Number of pages :
A1
Event name :
1st ICOS International Conference on Greenhouse Gases and Biogeochemical Cycles
Event organizer :
University of Antwerpen, University of Helsinki
Event date :
du 23 au 25 septembre 2014
Audience :
International
Name of the research project :
ETABLISSEMENT DU BILAN DE CARBONE D’UNE UNE EXPLOITATION AGRICOLE WALLONNE PRATIQUANT LE SYSTÈME ALLAITANT : EFFETS DU CLIMAT ET DE LA GESTION DU PÂTURAGE
Funders :
DGA - Région wallonne. Direction générale de l'Agriculture [BE]
Available on ORBi :
since 28 December 2014

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