Changes in land use system and environmental factors affect arbuscular mycorrhizal fungal density and diversity, and enzyme activities in rhizospheric soils of Acacia senegal (L.) willd

Ndoye Fatou, Kane Aboubacry, Ngonkeu Eddy Léonard Mangaptché, Bakhoum Niokhor, Sanon Arsene, Diouf Diégane, Sy Mame Ourèye, Baudoin Ezékiel, Noba Kandioura, Prin Yves. 2012. Changes in land use system and environmental factors affect arbuscular mycorrhizal fungal density and diversity, and enzyme activities in rhizospheric soils of Acacia senegal (L.) willd. ISRN Ecology, 2012 (ID 563191), 13 p.

https://doi.org/10.5402/2012/563191

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Résumé : The responses of the soil microbial community features associated to the legume tree Acacia senegal (L.) Willd. including both arbuscular mycorrhizal fungal (AMF) diversity and soil bacterial functions, were investigated under contrasting environmental conditions. Soil samples were collected during dry and rainy seasons in two contrasting rainfall sites of Senegal (Dahra and Goudiry, in arid and semiarid zone, resp.). Soils were taken from the rhizosphere of A. senegal both in plantation and natural stands in comparison to bulk soil. A multiple analysis revealed positive correlations between soil physicochemical properties, mycorrhizal potential and enzyme activities variables. The positive effects of A. senegal trees on soil mycorrhizal potential and enzyme activities indicates that in sahelian regions, AMF spore density and diversity as well as soil microbial functions can be influenced by land-use systems (plantation versus natural population of A. senegal) and environmental conditions such as moisture and soil nutrient contents. Our study underlines the importance of prior natural AMF screening for better combinations of A. senegal seedlings with AMF species to achieve optimum plant growth improvement, and for restoration and reforestation of degraded lands.

Mots-clés Agrovoc : Acacia senegal, mycorhizé à vésicule et arbuscule, activité enzymatique, flore microbienne, flore du sol, rhizosphère, dynamique des populations, relation plante sol, interactions biologiques, propriété physicochimique du sol, système de culture, facteur du milieu, peuplement forestier, plantation forestière