Impacto de Usos de um Latossolo vermelho de cerrado sobre a diversidade de fungos micorrízicos arbusculares.

Abstract

The aim of this study was to evaluate the diversity of arbuscular mycorrhizal fungi (AMFs) in different systems of management of the soil, in an Oxisoil in the Brazilian Cerrado Savannah, located at the experimental campus the Federal University the Goiás (UFG), Campus Jataí, (Goiás, Brazil). Ten samples were collected in tree management (coffee plantation, no tillage and pasture) and a native Cerrado Savannah. The collection were realized in two seasons, dry and wet, and AMF communities were propagated in trap culture, in the greenhouse, with Brachiaria brizantha, as host plant. 42 AMF species were recovered, being 18 Acaulospora, 10 Scutellospora, 07 Glomus, 06 Gigaspora and 01 Paraglomus, and of these 10 couldn t be identified, what can be an indicative of new species. The spore density was higher in dry than wet season, but. had not significant differences between samples collected in field and trap culture, considering species richness and spores density. Gigaspora decipiens and Gi. margarita, were found in all areas and in all seasons. The coffee plantation had the largest spores density, but smaller richness, with predominance that of Gigasporaceae family, and areas with no tillage and pasture presented larger diversity. Shannon-Weiner indices were larger in the pasture area, showing the more equal distribution in these samples. In conclusion, the increasing land use intensity was negativetly correlated with AMF diversity, with might influence the development of the selected plant species.