Soil organic matter pools under management systems in Quilombola Territory in Brazilian Cerrado/Compartimentos da materia organica do solo sob sistemas de manejo em Territorio Quilombola no Cerrado Brasileiro

The aim of this study was to evaluate the stable and labile fractions of soil organic matter and carbon (C) management index in cultivated areas with conservation and conventional management used by Quilombola farmers in the Goias state, Brazil. The management systems were studied in the areas of Cerradao: Native Cerrado; Pasture; Conventional grain cultivation; Conservation cultivation of perennial crop; and in the sensu stricto Cerrado: Native Cerrado; Natural pasture; Conventional grain cultivation; Conventional cultivation of perennial crop. The study was considered as observational, with five replicates. Total organic C, fractions of humic substances, labile C and C management index were determined. The Cerradao phytophysiognomy had the highest total organic C values and stable soil organic matter fractions. The native areas had low levels of labile C. The conservation cultivation of perennial crop showed the largest accumulation of total organic C in the different fractions of soil organic matter and the highest rates of C management index. Key words: labile carbon humic substances carbon management index Objetivou-se, neste trabalho, avaliar os compartimentos da materia organica do solo e o indice de manejo de carbono em areas cultivadas de forma conservacionista e convencional por agricultores quilombolas, em Goias. As areas estudadas foram no Cerradao: Cerrado Nativo; Pastagem; Plantio Convencional de Graos; Plantio Conservacionista de Cultura Perene; e no Cerrado sensu stricto: Cerrado Nativo; Pastagem Natural; Plantio Convencional de Graos; Plantio Convencional de Cultura Perene. Amostras de solo foram coletadas totalizando cinco repeticoes em cada area. Foram determinados o carbono organico total, as frames das substancias humicas, o carbono labil e o indice de manejo do carbono. A fitofisionomia cerradao apresentou os maiores valores de carbono organico total e das frames estaveis da materia organica do solo. As areas nativas apresentaram baixos teores de carbono labil. O cultivo conservacionista foi o que apresentou os maiores acumulos de carbono nos diferentes compartimentos da materia organica e o maior indice de manejo de carbono. Palavras-chave: carbono labil substancias humicas indice de manejo de carbono