FRAÇÕES DE CARBONO DO SOLO SOB DIFERENTES FITOFISIONOMIAS DO CERRADO NO PARQUE NACIONAL DAS NASCENTES DO RIO PARNAÍBA

Abstract

As far as the forms of land use are concerned, they may arise in the form of carbon. greenhouse effect. Soils are recognized as important summaries of greenhouse gases, especially for CO2. Thus, the aim of this study was to verify the carbon contents under phytosionomies of the cerrado biome and degraded area in the extreme south of Piauiense. The fields were excluded in three areas: Cerrado Sensu Stricto (SS) and Cerradão (CE), in the Parnaíba River Spring National Park (PNNRP), and a degraded area in the perimeter of the desertification nucleus of Gilbués - PI. Soil samples were collected at depths of 0 - 5 and 5 - 10 cm, to determine the carbon contents in the soil biotic structure, total carbon (TOC), carbon sequestration rate and then fractionation of the material organic. According to the results, it was verified that the contents of C were not statistically higher interactions between-type of area with evaluated evaluation, for Cerradão phytophysiognomy; The present study aims at the biomedical structuring of MOS for Cerrado-type phytophysiognomy, with different proportions in relation to Cerrado Senso Stratification and degraded area. However, they were not found to be statistically significant between the depths evaluated. Regarding TOC contents, the areas of analysis and soil depth do not interfere with the values. In relation to C-CO2, the soil depth is not significantly significant, but there is a significant difference between the type of area and the depth, which is adequate for the Cerrado Sensu Stricto physiognomy, this variable influences C sequestration, whereas water between 0 - 5 cm the mean values were higher for the native areas. It was obtained the humic fractions of three-dimensional MOS were superior exclusive in the areas of Cerradão in the two depths studied. The Humina fraction (HUM) was predominant for the soils sampled in the areas of Cerradão, Cerrado Sensu Strect phytophysiognomies, but for the Degraded Area there was a variation so that the Humic Acid values (AHU) were higher than Humina (HUM) and the Fulvic Acid (AFH). The humification indexes verified in the three areas indicate a good recalcitrance action of MOS, although in the first layers of soil. It was also verified that there is a lower process of humification in the degraded area, correlated to the loss of absolute contents of labile and non-labile organic matter, that collaborates with the decay of the processes of decomposition and transformation of MOS, to the stabilization state in humic fractions In this way, the importance of specially protected spaces, such as Conservation Units (CUs), important in the maintenance of C stock, is verified, considering that for the native areas of PNNRP, the contribution of C in the soil was higher, to balance the losses of altered areas.