Modelagem do teor de carbono orgânico em solos de fragmentos de cerrado de Januária e Bonito de Minas, Minas Gerais

Abstract

The total soil organic carbon (C) is regulated by climatic factors, altitude, texture and soil depth. Due to higher storage in surface, it is common exponential model fit to the C content in the soil profile. This study was carried out in order to study the influence of climatic factors, altitude and soil depth on the vertical distribution (0-100 cm) of C in five cerrado fragments located in the municipalities of Januária and Bonito de Minas, MG. Soil samples were collected in the following layers: 0-10, 10-20, 20-40, 40-60 and 60-100 cm. The maximum and minimum levels of C varies depending on the sampling site, fragment and soil layer sampled; larger variations in the levels of C are noted for the 0-10 cm layer, whose C content did not correlate with root and litter biomasses, and with other soil C conditioning factors tested. Specific logarithmic equations are provided for each of the five fragments in order to estimate the C contents (in the 0-100 cm soil layers) as a function of the average temperature, precipitation, altitude and fragment soil layer sampled.