Estoques de carbono em solos dos tabuleiros costeiros paraibanos: diferenças entre ambientes.

Abstract

The replacement of rain forest for sugar cane leads to significant changes in carbon stock and soil nitrogen and, consequently, the global cycling of these elements. The study was conducted in an area located in the municipality of Capim, Paraíba State, quantify the effects of different environments on the stocks of carbon (C) and nitrogen (N) in the Tabuleiros Costeiros Paraibanos. The soils were Argissolo Acinzentado distrófico típico e Neossolo Quartzarênico. The soil samples were performed in five replicates, at 0-5, 5-10, 10-20 and 20-40 cm. The environments were selected, namely: natural forest, sugar cane vinasse and cane sugar without vinasse. The pH, exchangeable bases and P, were variable, reflecting reflecting the effect of each environment. The concentrations and pools of carbon and nitrogen decreased after the change of native forest to plant sugar cane. In general, no significant difference in the levels and stocks of soil carbon between the environments of cane sugar in the different soil depths evaluated. But there were differences in the amounts and stock of carbon and nitrogen in cropping system without cane vinasse application in relation to native forest. The results of this study show that treatment with vinasse application promotes improvements in soil chemical properties such as pH increases and the availability of K and P in the surface layers of soil. This gave management the apparent increase in carbon storage and nitrogen. Thus, the management of soil with vinasse application can become an alternative to mitigate emissions of greenhouse effect, contributing to the sustainability of sugar cane production.