Methane emission suppression in flooded soil from Amazonia

Author(s)

Gabriel, Gabriele V. M. ^{[1, 2]} ; Oliveira, Luciana C. ^{[1, 2]} ; Barros, Dayane J. ^[3] ; Bento, Marilia S. ^[1] ; Neu, Vania ^[4] ; Toppa, Rogerio H. ^[5] ; Carmo, Janaina B. ^{[5, 1]} ; Navarrete, Acacio A. ^{[5, 1]}

Affiliation

^[1] Fed Univ Sao Carlos UFSCar, Grad Sch Biotechnol & Environm Monitoring, Rodovia Joao Leme Santos SP-264, Km 110, Sorocaba 18052780, SP - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Dept Phys Chem & Math, Rodovia Joao Leme Dos Santos SP-264, Km 110, Sorocaba 18052780, SP - Brazil

^[3] Fed Univ Tocantins UFT, Grad Sch Biodivers & Biotechnol BIONORTE, Quadra 109 Norte, Ave NS-15, ALCNO-14, Palmas 77001090, Tocantins - Brazil

^[4] Fed Rural Univ Amazonia UFRA, Socioenvironm & Water Resources Inst, Belem 66077530, Para - Brazil

^[5] Fed Univ Sao Carlos UFSCar, Dept Environm Sci, Rodovia Joao Leme dos Santos SP-264, Km 110, Sorocaba 18052780, SP - Brazil

• Document type: Journal article
• Source: Chemosphere; v. 250, JUL 2020.
• Web of Science Citations: 0

Abstract

The coupling between ferrous iron and methane production has important global implications, with iron ions acting as electron acceptors for anaerobic oxidation of methane (AOM) and inhibitors of methanogenesis in different environments, including floodplain soils. In this sense, we analyzed the relationship between Fe(II) concentration and methane production in soil layers collected at 0-15 cm and 15-30 cm from flooded-forest and -agroforestry in Amazonian clear water floodplain incubated in anaerobic batch reactors using acetate, formate and glucose as organic sources. High throughput sequencing of archaeal and bacterial 16S rRNA genes was employed to assess the abundance and composition of the active methanogenic and methanotrophic microbial groups potentially involved in Fe(III)-dependent AOM in the soil used as inoculum. Positive correlation was revealed between Fe(II) concentration and methane production, with higher accumulation of Fe(II) in incubated soil layer collected at 0-15 cm in both forest and agroforestry sites for all the three organic sources. The accumulation of Fe(II) in the incubated soil evidenced the oxidation of Fe(III) potentially by Methanobacterium, Desulfobulbus and `Candidatus methanoperedens nitroreducens' living in anaerobic condition at this soil layer. The results point out to the microbial ferric iron reduction as an important potential pathway for anaerobic organic matter decomposition in Amazonian floodplain, evidencing methanogenesis suppression by Fe(III) reduction in flooded-forest and -agroforestry in Amazonian clear water river floodplain. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 17/03575-5 - Dynamics of production and consumption of methane by active microbiota in Amazonian wetlands
• Grantee: Acacio Aparecido Navarrete
• Support type: Scholarships in Brazil - Research Program on Global Climate Change - Young Investigators
• FAPESP's process: 12/50694-6 - Greenhouse gases emission during vinasse and trash in areas cultivated with sugar cane: analytical infrastructure expansion
• Grantee: Janaina Braga do Carmo
• Support type: Regular Research Grants
• FAPESP's process: 16/16687-3 - Dynamics of production and consumption of methane by active microbiota in Amazonian wetlands
• Grantee: Acacio Aparecido Navarrete
• Support type: Research Program on Global Climate Change - Young Investigators
• FAPESP's process: 13/50940-0 - Unravelling the sources and sinks of nitrous oxide (N2O) in sustainable bio-based agriculture
• Grantee: Janaina Braga do Carmo
• Support type: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 16/10796-5 - NATURAL WASTE AS ENVIRONMENTAL REMEDIATION: MICROCOSMS APPLICATION
• Grantee: Luciana Camargo de Oliveira
• Support type: Regular Research Grants