Relações entre as colonizações por Fungos Micorrízicos Arbusculares e teores de nutrientes foliares em oito espécies florestais da Amazônia

Abstract

A large number of forestry species are found in the Amazon, several of which are of economic value, such as Abiurana (Eremoluma williamii), Andiroba (Carapa guianensis), Cardeiro (Scleronema micranthum), Cedrorana (Cedrelinga catenaeformis). Cumarú (Dipterix odorata), Jacareúba (Calophyllum angulare), Marupá (Simaruba amara) and Piquiá (Caryocar villosum). Their nutritional requirements and arbuscular mycorrhizae (AM) affinity are generally unknown when growing on acid and low fertility soils. Root, soil and leaf samples from adult plants were collected from experimental plantations growing on ultisols near Manaus, AM, Brazil. All the species presented endomycorrhizal fungi, but differed in tenns of colonization index, as well as macro and micronutrient contents of the leaves. Some statistically significant relationships were found (eight of a total of 64) between root colonization and Ca, P, Cu, Fe, Mn and Zn contents of the leaves. These relationships suggest that endomycorrhizae are contributing to plant nutrient absorption under the acid and low fertile soils in the Central Amazon.