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En Cote d’ Ivoire, la baissede la fertilite des terres de culture du manioc,  est a l’origine des rendements faibles. L’utilisation de l’effet benefique des  champignons mycorhiziens arbusculaires (CMA) pourrait ameliorer  durablement ces rendements. Ce travail a pour but de mettre en evidence l’ecologie, la diversite et la structuration des communautes de CMA  endogenes associes a la culture du manioc dans les sols de la zone  agroecologique d’Azaguie. Les etudes ont ete menees a partir des sols de champs de manioc (Ahoua 1, Ahoua 2, Mbrome 1, Mbrome 2). Ces sols etaient tres acides (pH inferieurs a 5,17), pauvres en bases echangeables (CEC inferieures a 17,1 cmol/kg), en phosphore assimilable (P.  assimilable inferieur a 30,71 ppm) et en matiere organique. Il a ete  denombre 44 especes de CMA reparties en treize genres. Les genres  Glomus (55,17 %) et Acaulospora (30,14 %) sont les plus abondants. Les densites des spores de CMA, sont inferieures a 14,68 spores.g-1. La proportion moyenne de spores non-viables (55 %) est elevee. Il a ete note des correlations positives entre les communautes de CMA et le  magnesium (R = 0,65), la CEC (R = 0,69), l'argile (R = 0,74) et le limon grossier (R = 0,79). Par contre des correlations negatives ont ete obtenues avec le sable fin (R = -0,60) et le sable grossier (R = -0,59). Mots cles : Manioc, Azaguie, Cote d’Ivoire, champignons mycorhiziens a arbuscules. INFLUENCE OF CASSAVA SOILS PHYSICOCHEMICAL PROPERTIES ONTHE ABUNDANCE AND DIVERSITYOF ARBUSCULAR MYCORRIZAL FUNGI  COMMUNITIES’ IN AZAGUIE AGROECOLOGICAL AREA, SOUTH-EAST COTE D’IVOIRE In Cote d’Ivoire, the decline in cassava soil fertility is causing low yields. The use of the beneficial effect of arbuscular mycorrhizal fungi (AMF) can sustainably improve the yields. The aim of this study was to highlight the ecology, diversity and community structure of endogenous CMA associated with cassava. The studies were conducted using cassava field soils (Ahoua 1 Ahoua 2 Mbrome 1 Mbrome 2). These soils were very acidic (pH less than 5.17), with low exchangeable bases capacities values (CEC less than 17.1 cmol / kg), low available phosphorus levels (available P less than 30.71 ppm) and poor organic matter proportions. Thirteen AMF genera comprising 44 species were identified. The genera Glomus (55.17 %) and Acaulospora (30.14 %) were the most abundant. AMF spores densities were (8.42 and 14.68 spores.g-1). The proportion of non-healthy spores was 55 %. There were positive correlations between AMF communities and magnesium (R = 0.65 and 0.59), CEC (R = 0.69), clay (R = 0.74) and coarse silt (R = 0.79) and negative correlations were obtained with fine sand (R = -0.60) and coarse sand (R = -0.59). Key words : Cassava, Azaguie Cote d’Ivoire, abuscular mycorrhiral fungi.

Impact des proprietes physicochimiques des sols de culture du manioc sur l’abondance et la diversite des communautes de champignons mycorhiziens à arbuscules dans la zone agroecologique d’azaguie, Sud-Est de la Côte D’Ivoire