Thermal stability of soil organic carbon after long-term manure application across land uses and tillage systems in an oxisol

Autor(es)

Barreto, Matheus Sampaio C. ^{[1, 2]} ; Ramlogan, Marlon ^[3] ; Oliveira, Dener Marcio S. ^[4] ; Verburg, Ernst Eduard J. ^[5] ; Elzinga, Evert J. ^[3] ; Rouff, Ashaki A. ^[3] ; Jemo, Martin ^[2] ; Alleoni, Luis Reynaldo F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Dept Soil Sci, Piracicaba, SP - Brazil

^[2] Mohammed VI Polytech Univ UM6P, AgroBiosci Program, Lot 660, Hay Moulay Rachid 43150, Benguerir - Morocco

^[3] Rutgers State Univ, Dept Earth & Environm Sci, Newark, NJ - USA

^[4] Fed Inst Goiano, Multiuser Lab Nat Sci, Campus Posse, Posse, Go - Brazil

^[5] Univ Saskatchewan, Soil Sci Dept, Saskatoon, SK - Canada

• Tipo de documento: Artigo Científico
• Fonte: CATENA; v. 200, MAY 2021.
• Citações Web of Science: 0

Resumo

The pool of carbon (C) present in soil systems is larger than the amount of organic C stored in living biomass and the atmosphere. Soil degradation has increased soil C emissions at the expense of C accumulation. Climate-smart management practices may be adapted to increase C sequestration as soil organic carbon (SOC). To avoid the SOC loss, different strategies have been applied, including no-tillage and organic fertilizer. Here, we investigated thermal stability of SOC after long-term manure application across land uses and tillage systems in weathered soils of Brazil. We chose five commercial areas with different land uses: pasture with swine manure (SM) application (PA + SM), conventional tillage (CT) with SM application (CT + SM), natural vegetation (NV), no-tillage with SM application (NT + SM), and no-tillage (NT). Thermal analysis revealed that SOC oxidation and CO2 emission started around 240 degrees C, close to gibbsite and goethite structural collapse, suggesting preferential adsorption of SOC onto these minerals. Approximately 50% of SOC for all sites was oxidizable at lower temperature (similar to 315 degrees C) which suggests the prevalence of polysaccharides, decarboxylation of acidic groups and dehydration of hydroxylate aliphatic structures, regardless of land-use. The energy content of SOC for NV (6.5) and PA + SM (10.6) were in average, 46% lower than other treatments which suggest a higher necromass contribution to SOC in these systems. However, the higher energy content in CT + SM (14.9), NT + SM (16.5), and NT (15.8), suggests a higher contribution of plant-derived compounds in SOC. Our results showed that SM application on pastureland reached similar SOC accumulation to NV and increment of similar to 33% when applied to notill system. We conclude that SM could a drive higher C accumulation and stabilization if preferentially associated to soil conservative system. (AU)

• Processo FAPESP: 16/05870-1 - ESPECIAÇÃO E CINÉTICA DE ADSORÇÃO E DESSORÇÃO DE Cd E DE Zn EM SOLOS DE ÁREAS OLERÍCOLAS ALTAMENTE FERTILIZADAS
• Beneficiário: Matheus Sampaio Carneiro Barreto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/22058-9 - Adsorção e dessorção de Cd e Zn em solos tropicais altamente fertilizados
• Beneficiário: Matheus Sampaio Carneiro Barreto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado