Diversity in soil fungi from Celtis tala and Scutia buxifolia forests in eastern Buenos Aires province (Argentina) II

ELIADES, L. A; C. VOGET; CABELLO M.N.

Journal of Agricultural Technology

Año: 2006 vol. 2 p. 229 - 246

Microfungi from three soils, namely Argialboll, Natracualf and Rendoll, from a native forest in Argentina were studied at two different depths by soil washing methods. Fungi were isolated by using both slightly acid (pH 6) and alkaline culture media (pH 8 and 11). Eighty-five taxa of fungi were recorded: 60 from Argialboll, 56 from Natracualf and 69 from Rendoll. Thirty-nine species were found to be present in the three soils. Anamorphic fungi showed the greatest number of species, varying between 74 and 82% of the total mycota identified. Ascomycota in Argialboll and Rendoll were more abundant in deeper horizons, whereas Zygomycota were more abundant in superficial horizons. However, in Natracualf, the largest number of Ascomycota and Zygomycota were found in superficial horizons and in deeper horizons, respectively. Fusarium solani and F. oxysporum were the species that mostly contributed to diversity. As pH increased, the frequency of F. solani increased, while that of F. oxysporumFusarium solani and F. oxysporum were the species that mostly contributed to diversity. As pH increased, the frequency of F. solani increased, while that of F. oxysporumF. solani increased, while that of F. oxysporum decreased. The number of fungal colonies present in each particle of soil plated decreased in the deeper horizons, while species richness was larger in the same horizons.