Carbon stock in an integrated system under different management in a Quartzipsamment

This study aimed to assess the carbon content and stock in an integrated crop-livestock-forestry (ICLF) system composed of soybean, Tamani grass, and eucalyptus, implemented on a Quartzipsamment (Tocantins – Brazil). The evaluation focused on comparing the impact of two distinct management systems on the soil: (1) a Tamani grass monoculture area and (2) an annual Tamani grass/soybean succession area. The field methodology, conducted in April 2025, involved the excavation and morphological description of two representative soil profiles for each management system, down to a depth of one meter. Soil sampling was stratified into the 0-5, 5-10, 10-15, 15-20, 20-30, 40-60, 60-80, and 80-100 cm layers. Undisturbed samples were collected using core rings for the subsequent determination of bulk density, and disturbed samples were collected for the chemical analysis of carbon content. he data were subjected to multivariate analysis (Principal Component Analysis, PCA). The soil carbon content (expressed in g/kg) revealed a subtle trend of greater accumulation in the surface layers (0-30 cm) under the Tamani/soybean succession system. For example, in the 0-10 cm layer, the content was 17.04 g/kg in the system with soybean, compared to 15.95 g/kg in the grass monoculture. The annual succession proves to be a promising strategy for increasing soil organic matter stocks, thereby mitigating impacts on sandy-textured soils.