SOIL CARBON STOCKS AND COMPARTMENTS OF ORGANIC MATTER UNDER CONVENTIONAL SYSTEMS IN BRAZILIAN SEMI-ARID REGION

Aldair de Souza Medeiros; Antônio Adolfo Silva Soares; Stoécio Malta Ferreira Maia

doi:10.1590/1983-21252022v35n321rc

Authors

Aldair de Souza Medeiros Center of Agrarian Sciences, Universidade Federal de Alagoas, Rio Largo, AL https://orcid.org/0000-0002-6087-6181
Antônio Adolfo Silva Soares Instituto Federal de Educação, Ciência e Tecnologia de Alagoas, Marechal Deodoro, AL https://orcid.org/0000-0003-2550-9180
Stoécio Malta Ferreira Maia Instituto Federal de Educação, Ciência e Tecnologia de Alagoas, Marechal Deodoro, AL https://orcid.org/0000-0001-6491-2517

DOI:

https://doi.org/10.1590/1983-21252022v35n321rc

Keywords:

Caatinga. Agriculture. Pasture. Particulate organic matter.

Abstract

The objective of this study was to evaluate the effect of the conversion of secondary native vegetation (NV) to conventional systems (agriculture and pasture) in soil organic carbon (SOC) and carbon of fractions particulate organic matter (POM) and mineral-associated organic matter (MAOM) in the Brazilian semi-arid region. The study was carried out in the municipalities of Delmiro Gouveia, Inhapi and Pariconha, in Alagoas, Brazil. Soils were collected in the layers of 0-0.1, 0.1-0.2 and 0.2-0.3 m. The treatments analyzed were: agricultural crops with 4, 15 and 30 years and pasture with 10 years. As a reference, the secondary Caatinga was used. The results show that in soils with sandy texture (Neossolos Quartzarênico and Regolítico – Arenosols and Regosols, respectively), there were reductions in SOC levels and carbon in the compartment associated with minerals. The inverse can be observed in the clay-textured Argissolo (Acrisols), with 30 years of cultivation, in which there was an increase in SOC and C in the quantitative fractions of soil organic matter. In addition, despite the sandy texture of the Neossolo Regolítico, POM levels were increased in the pasture system in comparison to native vegetation, but it was not enough to recover the original SOC content of this system.

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