Influência da sazonalidade na respiração basal microbiana em diferentes usos do solo: estudo de caso em uma área rural de Francisco Beltrão/PR

Abstract

The soil is formed by the actions of the atmospheric, physical, chemical and biological agents, being one of Earth's systems more complex. The importance of evaluating soil quality has been increasing because it is an indicator of the quality of the environment and its sustainability. Biological indicators are sensitive to changes in soil, temperature and humidity management, which make them suitable for evaluating soil quality. Microbial biomass is used as an indicator because it is sensitive to changes, and soil basal respiration (RBS) is the sum of all metabolic activities of microorganisms, which reflects in the CO2 production resulting from its respiratory activity and allows the study of the dynamics of microorganisms. A soil with a high RBS rate indicates greater microbial activity and an accelerated decomposition of the organic material, and a low rate indicates little microbial activity, that is, deficiency in the decomposition of organic matter. For the analysis, 27 samples were collected at three sites with different soil use: one area with the application of animal waste, the other two from plantation and native forest. The soil samples were incubated with NaOH and conditioned for one week. At the opening of the containers the BaCl2 solution was used to stop the reaction and titrated with the HCl solution for the determination of RBS. The highest values were found in the animal waste, followed by the plantation area and the native forest.