Well-managed grass is a key strategy for carbon storage and stabilization in anthropized Amazon soils

Autor(es)

Tenelli, S. ; Nascimento, A. F. ; Gabetto, F. P. ; Pimentel, M. L. ; Strauss, M. ; Bordonal, R. O. ; Cerri, C. E. P. ; Cherubin, M. R. ; Carvalho, J. L. N.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Environmental Management; v. 373, p. 11-pg., 2024-12-18.

Resumo

Soils under anthropic use in the Amazon region are often associated with soil carbon (C) stock losses. More recently, the restoration of degraded pastures and the introduction of integrated systems have changed this pattern, and soil C accumulation is often observed. This study evaluated an 11-year field experiment to quantify soil C changes and elucidate C stabilization mechanisms in areas under anthropic uses in the southern Amazon of Brazil. Four land use systems were evaluated: crop succession (CS), integrated crop-livestock (ICL), integrated crop-livestock-forest (ICLF), and a well-managed pasture (MP). Land uses with a greater presence of wellmanaged grass increased soil C stocks, especially in the top 10 cm, with values of 30.9, 29.7, 36.5, and 39.4 Mg ha-1 in the CS, ICLF, ICL, and MP systems, respectively. Compared to the baseline, ICL and MP systems showed soil C accumulation rates of 0.68-0.95 Mg C ha-1 yr-1. Greater aggregate stability and higher mineralassociated organic carbon (MAOC) were observed in both MP and ICL. X-ray photoelectron spectroscopy verified 11%, 38%, and 32% more recalcitrant C groups (aliphatic/aromatic) in the MP system than ICL, ICLF, and CS at 0-5 cm. In the ICLF system, the eucalyptus row showed 15% lower soil C stocks, less MAOC, and less abundance of recalcitrant groups than the inter-row position. Land use systems with long-term spatial-temporal use of grass in well-managed pastures or ICL promoted greater C stabilization through intra-aggregate occlusion, mineral sorption, and chemical recalcitrance, representing a good strategy to enhance C storage in Amazon anthropized soils. (AU)

• Processo FAPESP: 21/11995-0 - Uso de biochar na agricultura: implicações nas emissões de N2O e na comunidade microbiana do solo
• Beneficiário: Fernanda Palmeira Gabetto
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 22/07665-7 - Sistema de integração lavoura-pecuária como estratégia para estocar e estabilizar carbono no solo na agricultura Brasileira
• Beneficiário: Sarah Tenelli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 21/10573-4 - Centro de Pesquisa de Carbono em Agricultura Tropical (CCARBON)
• Beneficiário: Carlos Eduardo Pellegrino Cerri
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 21/02691-7 - Implicações da aplicação de biochar nas emissões N2O do solo e na produção de biomassa
• Beneficiário: Fernanda Palmeira Gabetto
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico