Carbon in Physical Fractions and Organic Matter Chemical Composition of an Acrisol after Amazon Forest Burning and Conversion into Pasture

Autor(es)

Leal, Otavio A. ^[1] ; Dick, Deborah P. ^[2] ; Costa, Falberni S. ^[3] ; Knicker, Heike ^[4] ; de Carvalho Junior, Jodo A. ^[5] ; Santos, Jose C. ^[6]

Afiliação do(s) autor(es)

^[1] IFC, BR-88965000 Santa Rosa Do Sul, SC - Brazil

^[2] Univ Fed Rio Grande do Sul, Dept Quim, BR-91501970 Porto Alegre, RS - Brazil

^[3] Embrapa Acre, Rodovia BR 364, Km 14, BR-69900970 Rio Branco, AC - Brazil

^[4] Inst Recursos Nat & Agrobiol Sevilla, Sevilha 41012 - Spain

^[5] Univ Estadual Paulista UNESP, Dept Energia, BR-12516410 Guaratingueta, SP - Brazil

^[6] INPE, Lab Associado Combustao & Propulsao, BR-12630000 Cachoeira Paulista, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 30, n. 2, p. 413-424, FEB 2019.
• Citações Web of Science: 0

Resumo

The aim of this study was to investigate impacts of Amazon Forest (AF) fire and conversion to pasture on carbon accumulation in particle size fractions and organic matter (OM) composition of an Acrisol. Soil samples were collected (0.00-2.00 m depth) in three sites: native AF (NAF); AF under natural regeneration for two years after burning (BAF); 23-years old Brachiaria pasture after AF burning (BRA). Assuming NAF area as reference, BAF and BRA areas showed negative carbon balance when carbon emitted to the atmosphere at AF burning is taken into account. Soil OM aromaticity and hydrophobicity, assessed via 13C nuclear magnetic resonance, in BRA and BAF were similar to that in NAF. Fire and post-fire land use altered the carbon distribution in sand, silt and clay along the soil profile and seem to have affected organo-mineral and OM self-assemblage interactions, since the relation between total soil carbon and carbon in clay was asymptotic in BAF and linear in NAF and BRA. (AU)

• Processo FAPESP: 08/04490-4 - Combustão de biomassa de florestas tropicais
• Beneficiário: João Andrade de Carvalho Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático