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Communication dans un congrès

"Faidherbia-Flux": adapting crops to climate changes in a semi-arid agro-sylvo-pastoral open observatory (Senegal)

Olivier Rouspard 1, * Cathy Clermont-Dauphin 1 Alain Audebert 2 Josias Sanou 3 Jonas Koala 3 Christophe Jourdan 4, 1, 5 Orange Didier 6 F. C. Do 7 Alain Rocheteau 1 Isabelle Bertrand 1 Emile Faye 8 L. Tall 9 E. Gaglo 9 A. Tounkara 9 G. Demarchi 10 T. Brévault 11 R. Vezy 12, 13 G. Le Maire 1, 5 J. Seghieri 7 L. Cournac 14
Abstract : The adaptation of semi-arid crops to climate changes is theoretically possible through agroforestry, provided that the trees exert little competition, or even increase the multifunctional LER (LER_M). We monitored microclimate, net primary productivity (NPP), CO2 and H2O fluxes in a semiarid agro-sylvo-pastoral system (Niakhar, Senegal), dominated by the multipurpose Faidherbia albida (FA) tree. Undercrops were mainly millet and peanut, under annual rotation. We scanned a 1.24 ha millet under FA plot with UAV photogrammetry in RGB, thermal infrared and multispectral bands. At harvest, we collected 12 subplots of 15 millet holes each, distributed either below the crown of FA, or at 2.5 x crown radius, or at 5 x crown radius. We separated all organs. The whole millet root system (0-200 cm) was sampled also in 2 m trenches, totalizing 4 millet holes, where all roots were sorted by layer. The whole plot harvest will allow extrapolating yield from subplots, through UAV images. Millet yield per unit ground area was about 3 times higher below FA, with still a positive influence at 2.5 x crown radius and less impacts of pests close to FA. In the trenches, we noted higher soil humidity and SOC close to the FA trunks. This observatory is open for collaboration.
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https://hal.umontpellier.fr/hal-02563125
Contributeur : Yannick Brohard <>
Soumis le : mercredi 13 mai 2020 - 10:41:48
Dernière modification le : jeudi 14 mai 2020 - 09:38:53

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  • HAL Id : hal-02563125, version 1

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Olivier Rouspard, Cathy Clermont-Dauphin, Alain Audebert, Josias Sanou, Jonas Koala, et al.. "Faidherbia-Flux": adapting crops to climate changes in a semi-arid agro-sylvo-pastoral open observatory (Senegal). 4th World congress on Agroforestry, Christophe Dupraz; M. Gosme; G. Lawson, May 2019, Montpellier, France. ⟨hal-02563125⟩

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