Ocorrência de microrganismos e determinação dos teores de carbono (cbm) e nitrogênio (nbm) de um solo de terra firme na floresta nacional de Caixuanã, Estação Ferreira Pena, Melgaço-Pa

Abstract

The existence and continuity of life on the globe has been based on a process called primary production, which is carried out by soil microorganisms acting on the detritus (leaves, flowers, fruits, branches, roots, etc.) deposited by the vegetation on the ground. The biomass, activity, and composition of these populations should be continuously investigated to assess their effects and contribution to natural soil fertility. In order to generate information about these populations, the present work aims to evaluate the composition of the microbial population (fungi and bacteria), determine the soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN). Samples were taken from different regions of the Caixuanã National Forest at depths of 0 to 10 and 10 to 20. The estimation of carbon (CBM) and nitrogen (NBM) contents of the microbial biomass will be done using the fumigation extraction method. To evaluate the microbial population the steps of counting, isolation and identification were used. The values obtained for carbon and nitrogen contents were not as expected and will be repeated. The counting results show significant differences between the profiles, with a difference in the range of occurrence of microorganisms, with the behavior of the fungi being very different from that of the bacteria, which predominate in all samples. The population characterization is homogeneous among all samples. The difference in the number of colonies is probably due to the physicochemical peculiarities of each soil profile.