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Humic fractions of soil carbon under agroforestry system in altitude swamp Pernambucano/Fracoes húmicas de carbono do solo sob sistema agroflorestal em brejo de altitude Pernambucano
MOS (soil organic matter) is a natural carbon reservoir, and divided into different stages of decomposition according to its solubility and structural complexity. In view of this context, this work aimed to quantify the carbon content in the humic fractions of the soil organic matter under an agrofo...
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Published in: | Ciência florestal 2024-01, Vol.34 (1), p.1 |
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Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | MOS (soil organic matter) is a natural carbon reservoir, and divided into different stages of decomposition according to its solubility and structural complexity. In view of this context, this work aimed to quantify the carbon content in the humic fractions of the soil organic matter under an agroforestry system in three toposequences in the swamp of altitude in Pernambuco, Brazil. The study was carried out on the Yaguara farm, and the studied areas were native forest and three toposequences of agroforestry system. Soil samples were collected in trenches 1.5 x 1.5 m, at depths 0-20, 20-40 and 40-60 cm, with four replications. The carbon concentrations in the humic fractions of the soil decreased with increasing depth. The area with agroforestry system had the highest concentrations of carbon in the humic fractions. The stocks of humic fractions found in the agroforestry system area showed higher average values in the top area 5.62, 9.72 and 22.53 Mg [ha.sup.-1] in relation to native forest 4.84, 8.28 and 19.20 Mg [ha.sup.-1], respectively for fulvic acid, humic acid and humine. Among the evaluated areas, the soil with agroforestry system top area has great potential to increase the carbon storage in the humic fractions of the soil. Keywords: Soil organic matter; Fulvic acid; Humic acid; Humine A MOS (matéria orgânica do solo) é um reservatório natural de carbono e dividida em diferentes estágios de decomposicão conforme sua solubilidade e complexidade estrutural. Diante desse contexto, este trabalho teve como objetivo quantificar os teores de carbono nas fracoes húmicas da matéria orgânica do solo sob sistema agroflorestal em três topossequências no brejo de altitude de Pernambuco, Brasil. O estudo foi desenvolvido na fazenda Yaguara, e as áreas estudadas foram mata nativa e três topossequências de sistema agroflorestal. As amostras de solos foram coletadas em trincheiras 1,5 x 1,5 m, nas profundidades 0-20, 20-40 e 40-60 cm, com quatro replicacoes. As concentracoes de carbono nas fracoes húmicas do solo diminuÃram com o aumento da profundidade. A área com sistema agroflorestal teve as maiores concentracoes de carbono nas fracoes húmicas. Os estoques das fracoes húmicas encontradas em área de sistema agroflorestal apresentaram maiores valores médios em área de topo 5,62, 9,72 e 22,53 Mg [ha.sup.1] em relacão à mata nativa 4,84, 8,28 e 19,20 Mg [ha.sup.1], respectivamente para ácido fúlvico, ácido húmico e humina. Dentre as área |
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ISSN: | 1980-5098 1980-5098 |
DOI: | 10.5902/1980509865061 |