Reference : Interannual variability of CO2 fluxes and yield by a winter wheat crop (Triticum aestivu...
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/58340
Interannual variability of CO2 fluxes and yield by a winter wheat crop (Triticum aestivum L.)
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 >]
20-Apr-2009
No
International
l’European Geophysical Union
19-25 avril 2009
Vienne
Autriche
[en] In this study, two winter wheat (Triticum aestivum L.) cropping seasons were compared at the Lonzée (Belgium) experimental site. The site, crop management, sowing and harvest dates were similar on the two years. The main difference between the seasons was due to to climate conditions. Continuous eddy-covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the whole vegetation periods. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C respectively against 9.4 °C for standard) and lower than normal rainfalls (595.1 mm and 675.1 mm respectively against 772 mm for standard). In addition, the second season (2006-2007) was characterised by an exceptionally mild winter, dry and hot conditions in April and by humid and cloudy conditions during the last vegetation phases. These particular conditions induced earlier growth stages and the comparison of global fluxes gives contrasting results: gross primary productivity (GPP) was larger in 2007 but, on the contrary, net primary productivity (NPP) and crop productivity were lower on this year. The bad yields could be explained, on one hand by the drought in April 2007 that induced abnormally small flag leaves, on the other hand by cloudy and humid conditions from end May to harvest, that induced an assimilation reduction due to low radiation and favoured disease development. The simultaneous higher GPP and lower NPP and productivity in 2006-2007 raise the question of carbon allocation. It suggests that the excess carbon assimilated in 2006-2007 was not stored in grain or straw and thus that it would have been stored in the roots or in vegetation parts that decompose before the harvest. Further biomass measurements (and especially root biomass) are necessary to confirm 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/2268/58340

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
2009 Dufranne EGU.pdfPublisher postprint879.74 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.