AVALIAÇÃO DA ATIVIDADE MICROBIANA BASEADA NA PRODUÇÃO DE C-CO2 EM UMA ÁREA DE CAATINGA NO CARIRI PARAIBANO

Abstract

The high incidence of the solar radiation and temperature and the high annual variability of the rainfall during the year in the region of semiarid Paraiba, contribute for the losses of CO2 of the soil. The aim of this paper is to evaluate the microbial activity according the emissions of C-CO2 in a micro basin which is in a process of environmental degradation in Paraíba semiarid, located in the "Fazenda Experimental Bacia Escola, CCA, UFPB" in São João do Cariri, PB, during a translation, in the years of 2003 to 2004. Five points of determination had been choosed in a toposequence where there vas evaluated the microbial activity by the C-CO2 production. In the rainy season the tax of losses of CO2 of the soil diminished independent of the position of determination in the toposequence. In the dry season, when there was some pluviometric precipitation, the tax of edaphic respiration, expressed in terms of losses of CO2 from the soil to the atmosphere, increased with the water availability of the soil.