Total and Particulate Contents and Vertical Stratification of Organic Carbon in Agroforestry System in Caatinga

Abstract

The objective of this work was to evaluate the variation in total and particulate organic carbon contents, carbon vertical stratification, and sensitivity index of organic matter fractions in soils with organic residues arranged in alleys in an agroforestry system, with and without use of fire, in the Caatinga biome, in Brazil. The experiment was conducted in a split-plot arrangement with four replications, with the factor fire in the plots, and the factor organic residues in the subplots. The organic residues used consisted of Gliricidia sepium plants; G. sepium plants and carnauba processing residue; G. sepium plants and bio-compost; and G. sepium plants, carnauba processing residue, and bio-compost, which were evaluated in three soil layers. The alleys with carnauba processing residue, G. sepium plants, and bio-compost presented a better maintenance of particulate, and mineral-associated organic carbon contents. Thus, the agroforestry management in alleys using these three residues was efficient for the maintenance of labile and recalcitrant organic matter compartments. Particulate organic carbon was more sensitive to changes in soil management than total organic matter content, in all alleys, presenting higher sensitivity indexes.

Ciclo do carbono e sistemas agroflorestais na sustentabilidade da produção agrícolas: revisão de literatura

“…Ou seja, expressa com muita clareza a capacidade que os SAF têm de promover a recuperação em médio e longo prazo da qualidade do solo, assim como de estocar C, fortalecendo, dessa maneira, a hipótese de que os SAF são tecnologias de produção agrícola com potencial para mitigar as emissões de CO 2 e, ao mesmo tempo, produzir alimentos e matéria-prima de origem vegetal de forma sustentável. Iwata et al (2021) avaliaram a variação dos teores de C orgânico total e particulado, estratificação vertical do C e índice de sensibilidade das frações da matéria orgânica em solos com resíduos orgânicos dispostos em alamedas em CRESPO, A. M. et al…”