Response of native soil microbial functions to the controlled mycorrhization of an exotic tree legume, <Emphasis Type="Italic">Acacia holosericea</Emphasis> in a Sahelian ecosystem |
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Authors: | Ablasse Bilgo Sheikh K Sangare Jean Thioulouse Yves Prin Victor Hien Antoine Galiana Ezekeil Baudoin Mohamed Hafidi Amadou M Bâ Robin Duponnois |
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Institution: | 1.Laboratoire Sol-Eau-Plante (SEP),Institut de l’Environnement et de Recherches Agricoles (INERA),Ouagadougou,Burkina Faso;2.UMR5558, Laboratoire de Biométrie et Biologie Evolutive,Centre National de la Recherche Scientifique (CNRS),Villeurbanne,France;3.UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et méditerranéennes (LSTM), Campus International de Baillarguet,Centre de Coopération Internationale en recherche agronomique pour le Développement (CIRAD),Montpellier,France;4.UMR 113 CIRAD/INRA/IRD/AGRO-M/UM2, Laboratoire des Symbioses Tropicales et méditerranéennes (LSTM), Campus International de Baillarguet,Institut de Recherche pour le Développement (IRD),Montpellier,France;5.Faculté des Sciences Semlalia, Laboratoire Ecologie & Environnement, Unité associée au CNRST, URAC 32,Université Cadi Ayyad,Marrakech,Maroc;6.Laboratoire Commun de Microbiologie IRD/ISRA/UCAD,Institut de Recherche pour le Développement (IRD), Centre de Recherche de Bel Air,Dakar,Senegal |
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Abstract: | Fifty years of overexploitation have disturbed most forests within Sahelian areas. Exotic fast growing trees (i.e., Australian
Acacia species) have subsequently been introduced for soil improvement and fuelwood production purposes. Additionally, rhizobial
or mycorrhizal symbioses have sometimes been favored by means of controlled inoculations to increase the performance of these
exotic trees in such arid and semiarid zones. Large-scale anthropogenic introduction of exotic plants could also threaten
the native biodiversity and ecosystem resilience. We carried out an experimental reforestation in Burkina Faso in order to
study the effects of Acacia holosericea mycorrhizal inoculation on the soil nutrient content, microbial soil functionalities and mycorrhizal soil potential. Treatments
consisted of uninoculated A. holosericea, preplanting fertilizer application and arbuscular mycorrhizal inoculation with Glomus intraradices. Our results showed that (i) arbuscular mycorrhizal (AM) inoculation and prefertilizer application significantly improved
A. holosericea growth after 4 years of plantation and (ii) the introduction of A. holosericea trees significantly modified soil microbial functions. The results clearly showed that the use of exotic tree legume species
should be directly responsible for important changes in soil microbiota with great disturbances in essential functions driven
by microbial communities (e.g., catabolic diversity and C cycling, phosphatase activity and P availability). They also highlighted
the importance of AM symbiosis in the functioning of soils and forest plantation performances. The AM effect on soil functions
was significantly correlated with the enhanced mycorrhizal soil potential recorded in the AM inoculation treatment. |
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