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

Roupsard Olivier, Clermont-Dauphin Cathy, Audebert Alain, Sanou Jacob, Koala J., Jourdan Christophe, Orange Didier, Do Frédéric C., Rocheteau Alain, Bertrand Isabelle, Faye Emile, Tall Laure, Gaglo E., Tounkara Adama, Demarchi Gabriela, Brévault Thierry, Vezy Rémi, Le Maire Guerric, Seghieri Josiane, Cournac Laurent. 2019. "Faidherbia-Flux": adapting crops to climate changes in a semi-arid agro-sylvo-pastoral open observatory (Senegal). In : 4th World Congress on Agroforestry. Book of abstracts. Dupraz Christian (ed.), Gosme Marie (ed.), Lawson Gerry (ed.). CIRAD, INRA, World Agroforestry, Agropolis International, MUSE. Montpellier : CIRAD-INRA, Résumé, p. 72. World Congress on Agroforestry. 4, Montpellier, France, 20 Mai 2019/22 Mai 2019.

https://agroforestry2019.cirad.fr/news-press

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Résumé : 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.

Mots-clés Agrovoc : système agrosylvopastoral, adaptation aux changements climatiques

Mots-clés géographiques Agrovoc : Sénégal

Classification Agris : F08 - Systèmes et modes de culture
K10 - Production forestière
P40 - Météorologie et climatologie

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