Quantificação das perdas de fósforo em sedimentos de um luvissolo com e sem cobertura vegetal no Cariri Paraibano.

Abstract

The erosion is the main form of soil degradation in the world, being the hydric the most predominant in Brazil. This work aimed to quantify the loss of phosphorus associated pulses of precipitation in areas with different types of vegetation cover, being P1 = soil without vegetation, P2 = soil under cultivation of forage palm and P3 = soil under preserved native vegetation. During the development of the research, soil loss plots were installed in the experimental area of the Center for Sustainable Development of the Semiarid of the Federal University of Campina Grande, in the municipality of Sumé, cariri paraibano. The results showed that P1 presented the highest amounts of sediment production, approximately 1.4 t/ha, followed by P3, with 0.88 kg/ha and P2 with 0.29 kg/ha. As for the lamina drained, in P1 a lamina of 13.7 mm was verified, followed by P2 and P3, which presented 0.277 and 0.042 mm respectively. Therefore, bare soils suffer constant loss of material, presenting a greater production of sediment, runoff and a greater number of soluble phosphorus lost; on the other hand, the preserved native vegetation protects the soil and promotes the permanence of phosphorus in that soil.