Estimativa e modelagem dos estoques de carbono em solos sob áreas de campo limpo úmido do Distrito Federal / Estimates and modelling carbon stocks in soil under humid grassland Estimates and modelling carbon stocks in soil under humid grassland Estimates

Abstract

The main purpose of this study was to obtain basic quantitative parameters for carbon storage and modeling the soil organic carbon (SOC) in Humid Grassland (Campo LimpoÚmido), a kind of grassland phytophysiognomy found in the Cerrado. We selected 4 regions of the Federal District with this kind of vegetation formation, characterized by low anthropic impact. In each one of the sampled regions, we marked a transect with 4 equidistant points and collected material at 7 different levels of depth: 0-5, 5-10, 10-20, 20-30, 30-40, 40-50 and 50-60 cm. We determined the texture, bulk density and concentration of carbon at each depth. The average carbon storage for Humid Grassland areas, down to 60 cm deep, was 243.16 Mg C ha-1 and the total estimated stock for these areas in the Federal District was 205.86 Gg C. In general, the samples obtained in gleysols showed a carbon stockand SOC superior to those in plinthosols.The function obtained with the modeling of the independent variables (bulk density, sand, clay and silt) proved to be able to properly estimate the SOC in gleysol (R2 = 0,88, RMSD = 1,48; RMSD validação = 1,49) and in plinthosol(R2 = 0,77, RMSD = 1,57; RMSD validação = 1,62).

Keywords

• Carbon Stocks; Cerrado; Wetland; Grasslands.