Atividade microbiana de solos de manguezais em ambientes com diferenças de salinidade e sujeito a influência marinha ou fluvial: caracterização físico-química do solo e da manta orgânica

Abstract

The microbial biomass is considered as a transformation agent, through which pass all organic materials added to the soil, as a reservoir of nutrients, being its study of great importance in soil management systems and mangrove ecosystems. The present work aims to analyze the microbial biomass chemically (C, N, and P) and to evaluate the microbial activity by C-CO" production through soil samples and mangrove organic mats, in sites under marine and fluvial influence as well as seasonal differences in the Mojuim River. Soil samples were collected at depths of 0-5cm and 5-10cm, and measurements of pH, eH, temperature, salinity at depth 0-5cm at the studied sites. In this summary the physicochemical and Carbon and Nitrogen measurements of the organic blanket and soil will be presented. The pH is acidic in both environments, but it was the riverine environment that presented higher acidity. In the rainy season, in the marine influence areas, salinity decreases with an increase in pH and eH. The values of Ce Na were higher in the organic blanket than in the soil, where there was no difference between the values in depth. In relation to salinity, C and N were higher in the less saline environment. Seasonality had no influence on the levels of Ce N in the soil of the more saline area. The values of C and N were directly proportional. When comparing the salinity of the environments, it was verified that the less saline environment (riverine) presented a higher amount of nutrients (Ce N), which may be due to the higher amount of organic matter present in it. The marine environment showed a change in its physical-chemical aspect in the rainy season, this may be related to the increased dilution power of the river, due to increased rainfall in this period.