CIRAD - Centre de coopération internationale en recherche agronomique pour le développement
- France, Kourou
CIRAD Guyane Campus Agronomique de Kourou - BP 701 97387 KOUROU Cedex - France

Agronomist in the CIRAD joint research unit UMR ABSys at Kourou in French Guinea. Head of the Tropical Agroforestry Systems (TAFS). Working on the functioning and design of agroforestry systems, with the following objectives: to enhance farmers’ livelihoods and food security; to develop agroforestry systems that are more resilient with respect to hazards and climate change. He studies trade-offs between ecosystem services that these complex systems may provide.
Scientific articles :
Saj S, Decayeux E. Évaluation prospective de la viabilité économique de la culture du cacaoyer en Guyane française. Soumis BASE, dec. 2020
Saj S, Nijmeijer A, Essobo-Nieboukaho J-D, Lauri P-É, Harmand J-M. Litterfall and leaf litter decomposition in cocoa agroforests established on past forest lands or savannah. Submitted to AgroForestry Systems, nov. 2020.
Mérot A., Belhouchette H., Saj S., Wery J. 2020. Implementing organic farming in vineyards. Agroecology and Sustainable Food Systems, 44 (2) : p. 164-187.
doi.org/10.1080/21683565.2019.1631934
Sauvadet M., Saj S., Freschet G.T., Essobo Nieboukaho J.D., Enock S., Becquer T., Tixier P., Harmand J.M. 2020. Cocoa agroforest multifunctionality and soil fertility explained by shade tree litter traits. Journal of Applied Ecology, 57 (3) : p. 476-487.
doi.org/10.1111/1365-2664.13560
Nijmeijer A., Lauri P.E., Harmand J.M., Freschet G.T., Essobo Nieboukaho J.D., Kenfack Fogang P., Enock S., Saj S. 2019. Long-term dynamics of cocoa agroforestry systems established on lands previously occupied by savannah or forests. Agriculture, Ecosystems and Environment, 275 : p. 100-111.
doi.org/10.1016/j.agee.2019.02.004
Nijmeijer A., Lauri P.E., Harmand J.M., Saj S. 2019. Carbon dynamics in cocoa agroforestry systems in Central Cameroon: afforestation of savannah as a sequestration opportunity. AgroForestry Systems, 93 (3) : p. 851-868.
doi.org/10.1007/s10457-017-0182-6
Jagoret P., Snoeck D., Bouambi E., Ngnogue H.T., Nyassé S., Saj S. 2018. Rehabilitation practices that shape cocoa agroforestry systems in Central Cameroon: key management strategies for long-term exploitation. AgroForestry Systems, 92 (5) : p. 1185-1199.
doi.org/10.1007/s10457-016-0055-4
Andreotti F., Mao Z., Jagoret P., Speelman E.N., Gary C., Saj S. 2018. Exploring management strategies to enhance the provision of ecosystem services in complex smallholder agroforestry systems. Ecological Indicators, 94 (1) : p. 257-265.
doi.org/10.1016/j.ecolind.2018.06.048
Mortimer R., Saj S., David C. 2018. Supporting and regulating ecosystem services in cacao agroforestry systems. AgroForestry Systems, 92 (6) : p. 1639-1657.
dx.doi.org/10.1007/s10457-017-0113-6
Saj S., Torquebiau E., Hainzelin E., Pagès J., Maraux F. 2017. The way forward: An agroecological perspective for Climate-Smart Agriculture. Agriculture, Ecosystems and Environment, 250 : p. 20-24.
dx.doi.org/10.1016/j.agee.2017.09.003
Saj S., Durot C., Mvondo Sakouma K., Tayo Gamo K., Avana-Tientcheu M.L. 2017. Contribution of associated trees to long-term species conservation, carbon storage and sustainability: A functional analysis of tree communities in cacao plantations of Central Cameroon. International Journal of Agricultural Sustainability, 15 (3) : p. 282-302.
dx.doi.org/10.1080/14735903.2017.1311764
Saj S., Jagoret P., Essola Etoa L., Fonkeng E.E., Ngala Tarla J., Essobo Nieboukaho J.D., Mvondo Sakouma K. 2017. Lessons learned from the long-term analysis of cacao yield and stand structure in central Cameroonian agroforestry systems. Agricultural Systems, 156 : p. 95-104.
dx.doi.org/10.1016/j.agsy.2017.06.002
Saj S., Jagoret P., Todem H. 2013. Carbon storage and density dynamics of associated trees in three contrasting Theobroma cacao agroforests of Central Cameroon. AgroForestry Systems, 87 (6) : p. 1309-1320.
dx.doi.org/10.1007/s10457-013-9639-4
Mikola, J & Saj, S. 2012. Impacts of trace amounts of labile C on plant N limitation vary from hour to week timescales. Biology and Fertility of Soils. 48, p. 851–857.
dx.doi.org/10.1007/s00374-012-0680-7
Djigal, D., Saj, S., Rabary, B., Blanchart, E., Villenave, C. 2012. Mulch type affects soil biological functioning and crop yield of conservation agriculture systems in a long-term experiment in Madagascar. Soil and Tillage Research, 118, p.11-21.
www.sciencedirect.com/science/article/pii/S0167198711001747
Villenave C., Saj S., Attard E., Klumpp K., Le Roux X. 2011. Grassland management history affects the response of the nematode community to changes in above-ground grazing regime. Nematology, 13 (8) : p. 995-1008.
dx.doi.org/10.1163/138855411X574558
Villenave C., Saj S., Pablo A.L., Sall S., Djigal D., Chotte J.L., Bonzi M. 2010. Influence of long-term organic and mineral fertilization on soil nematofauna when growing Sorghum bicolor in Burkina Faso. Biology and Fertility of Soils, 46 (7) : p. 659-670.
dx.doi.org/10.1007/s00374-010-0471-y
Ladygina N., Henry F., Kant M.R., Koller R., Reidinger S., Rodriguez A., Saj S., Sonnemann I., Witt C., Wurst S. 2010. Additive and interactive effects of functionally dissimilar soil organisms on a grassland plant community. Soil Biology and Biochemistry, 42 : p. 2266-2275.
dx.doi.org/10.1016/j.soilbio.2010.08.027
Saj S., Mikola J., Ekelund F. 2009. Species-specific effects of live roots and shoot litter on soil decomposer abundances do not forecast plant litter-nitrogen uptake. Oecologia, 161 (2) : p. 331-341.
dx.doi.org/10.1007/s00442-009-1380-3
Ekelund F., Saj S., Vestergard M., Bertaux J., Mikola J. 2009. The `soil microbial loop` is not always needed to explain protozoan stimulation of plants. Soil Biology and Biochemistry, 41 : p. 2336-2342.
dx.doi.org/10.1016/j.soilbio.2009.08.019
Saj S., Mikola J., Ekelund F. 2008. Legume defoliation affects rhizosphere decomposers, but not the uptake of organic matter N by a neighbouring grass. Plant and Soil, 311 (1) : p. 141-149.
dx.doi.org/10.1007/s11104-008-9665-6
Saj S., Mikola J., Ekelund F. 2007. Root-induced decomposer growth and plant N uptake are not positively associated among a set of grassland plants. Applied Soil Ecology, 37 : p. 215-222.
dx.doi.org/10.1016/j.apsoil.2007.06.008