Diversidade de glomeromycetes e atividade microbiana em solos sob vegetaÃÃo nativa do semi-Ãrido de Pernambuco




The occurrence of arbuscular mycorrhizal fungi (AMF) was studied in three areas of caatinga, located in the municipalities of Caruaru, Serra Talhada and Araripina, in Pernambuco. Soil samples were collected in August and December/2005 and August and October/2006. The AMF species were identified and the structure of the community, the mycorrhizal condition of the plants, the potential of infectivity (NMP), and the number of AMF spores were evaluated, along with the microbiological parameters: microbial biomass carbon - CBM, soil basal respiration - RBS, metabolic quotient - qCO2 and soil proteins related to the glomalin - PSRG. Twenty nine AMF species were identified, being Acaulospora the predominant genus. The AMF community composition and structure differed between the areas. Differences, influenced by soil factors such as texture, aluminium, pH and organic matter content, were also detected between the mycorrhizal colonization of the roots, the spore production and the NMP of AMF. The CBM, RBS, qCO2 and PSRG were mainly influenced by differences in the soil organic matter content. The AMF are important components of the Caatinga bioma. Soil factors, along with the semiarid condition, can be related to the distribution of these fungi in the studied environment


caatinga diversity fatores do solo fungos micorrÃzicos arbusculares soil factors microbiologia aplicada diversidade caatinga arbuscular mycorrhizal fungi

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