Article (Scientific journals)
Long term observations of carbon dioxide exchange over cultivated savanna under a Sudanian climate in Benin (West Africa)
Ago, Expédit Evariste; Agbossou, Euloge Kossi; Galle, Sylvie et al.
2014In Agricultural and Forest Meteorology, 197, p. 13-25
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Keywords :
Eddy-covariance; Savanna; Net ecosystem exchange; Annual sequestration; Sudanian climate; West Africa
Abstract :
[en] Turbulent CO2 exchanges between a cultivated Sudanian savanna and the atmosphere were measured during 29 months (August 2007–December 2009) by an eddy-covariance system in North-Western Benin, West Africa. The site (Lat 9.74◦ N, Long 1.60◦ E, Alt: 449 m) is the one of three sites fitted out by the international AMMA-CATCH program. The flux station footprint area is mainly composed of herbs and crops with some sparse trees and shrubs. Fluxes data were completed by an inventory of dominating species around the tower and the meteorological measurements. Flux response to climatic and edaphic factors was studied. Water was found the main controlling factor of ecosystem dynamics: much larger uptake was found in wet than dry season. During wet season, a very clear answer of net CO2 fluxes to photosynthetic photon fluxes density (PPFD) was observed. A low limitation in response to saturation deficit and soil water variability was however observed. The total ecosystem respiration (TER) was found highly dependent on soil moisture below 0.1 m3m−3, but saturates above this threshold. The average annual carbon sequestration was 232 ± 27 gC m−2 with its inter-annual variability mainly controlled by TER. Finally, the ecosystem appeared more efficient during morning and wet season than during afternoon and dry period.
Disciplines :
Agriculture & agronomy
Earth sciences & physical geography
Author, co-author :
Ago, Expédit Evariste ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Agbossou, Euloge Kossi;  Université d’Abomey-Calavi
Galle, Sylvie;  IRD/UJF-Grenoble 1/CNRS/G-INP, LTHE UMR 5564, Grenoble
Cohard, Jean-Martial;  UJF-Grenoble 1/CNRS/G-INP/IRD, LTHE UMR 5564, Grenoble
Heinesch, Bernard  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Aubinet, Marc ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Language :
English
Title :
Long term observations of carbon dioxide exchange over cultivated savanna under a Sudanian climate in Benin (West Africa)
Publication date :
2014
Journal title :
Agricultural and Forest Meteorology
ISSN :
0168-1923
eISSN :
1873-2240
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
197
Pages :
13-25
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 06 March 2015

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