Reference : Impact of climatic conditions on a winter wheat (Triticum aestivum Sp.) crop : intera...
Scientific congresses and symposiums : Poster
Life sciences : Agriculture & agronomy
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/39817
Impact of climatic conditions on a winter wheat (Triticum aestivum Sp.) crop : interannual variability of CO2 fluxes, plant growth and crop yield
English
Dufranne, Delphine mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
Vancutsem, Françoise [Université de Liège - ULg > Sciences agronomiques > Phytotechnie des régions tempérées >]
Moureaux, Christine mailto [Université de Liège - ULg > Sciences agronomiques > Phytotechnie des régions tempérées >]
Hoyaux, Julien [ > > ]
Bodson, Bernard mailto [Université de Liège - ULg > Sciences agronomiques > Phytotechnie des régions tempérées >]
Aubinet, Marc mailto [Université de Liège - ULg > Sciences et technologie de l'environnement > Physique des bio-systèmes >]
Sep-2008
No
International
CarboEyrope-IP Meeting
29 septembre au 3 Octobre 2008
Jena
Germany
[en] Winter wheat ; Climatic conditions ; CO2 ; Plant growth ; Yield
[en] This study analyses the interannual variability of carbon dioxide fluxes, growth and productivity of a winter wheat (Triticum aestivum L.) crop. Two growing seasons (2004-2005 and 2006-2007) were compared. Continuous eddy covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the two vegetation seasons until harvest at the Lonzée (Belgium) experimental site. The winter wheat was sown and harvested at similar dates (about mid-October and in early August); crop management by the farmer was similar and corresponded at standard. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C against 9.4 °C) and lower than normal rainfalls (595.1 mm and 675.1 mm against 772 mm). In addition, 2006-2007 was characterised by exceptionally mild and dry winter and spring. This induced not only earlier growth stages but also a larger Gross Primary Productivity. On the contrary, lower Net Primary Productivity and crop productivity were observed on this year. This could be explained, on one hand by the drought in April 2007 and on the other hand to cloudy and humid conditions from end May to harvest. The first induced a stress in wheat plant which produced an unusually small flag leaf. The second induced an assimilation reduction due to low radiation and favoured disease development. The higher GPP and the lower productivity in 2006-2007 raise the question of carbon allocation. We supposed that, as the excess of carbon assimilated in 2006-2007 was not stored in grain or straw, it should have been stored in the roots. However, our biomass measurements did not allow confirming this hypothesis
Ulg, GxABT
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Impact de la gestion culturale et du climat sur les flux de CO2, le développement et le rendement de grandes cultures
http://hdl.handle.net/2268/39817

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