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Article

Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances

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Department Biogeochemistry and Microbial Ecology, Museo Nacional de Ciencias Naturales-CSIC (MNCN-CSIC), Serrano 115 Bis, E-28006 Madrid, Spain
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Department Water and Environmental Sciences, Instituto Tecnológico de Sonora (ITSON), 5 de Febrero 818 Sur, Col. Centro, Ciudad Obregón CP. 85000, Sonora, Mexico
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SpatialTools, Clara del Rey 79, E-28002 Madrid, Spain
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Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, Juriquilla CP. 76230, Querétaro, Mexico
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Faculty Química y Farmacobiología, Universidad Michoacana de San Nicolás de Hidalgo (UMICH),Tzinzuntzan 173, Col. Matamoros, Morelia CP. 58030, Michoacán, Mexico
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Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (ICMyL-UNAM), Cto. Exterior s/n, Ciudad Universitaria, Del. Coyoacán, Ciudad de México CP. 04510, Mexico
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Departamento de Biotecnología y Bioingeniería, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (Cinvestav-IPN), Av. IPN 2508, San Pedro Zacatenco, Gustavo A. Madero, Ciudad de México CP. 07360, Mexico
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Author to whom correspondence should be addressed.
Academic Editor: Thomas Meixner
Water 2021, 13(13), 1867; https://doi.org/10.3390/w13131867
Received: 26 May 2021 / Revised: 18 June 2021 / Accepted: 24 June 2021 / Published: 4 July 2021
Considerable variability in methane production and emissions has been reported in mangroves, explained by methane inhibition and oxidation. In this study, soil pore waters were collected from mangrove forests located in the Gulf of California (Mexico) exposed to shrimp farm disturbance. The δ13C of dissolved inorganic carbon (DIC) and CH4 were analyzed along with the δ13C of the soil organic matter to assess the proportion of CO2 derived from methanogenesis, its main pathway, and the fraction of methane oxidized. We performed slurry incubation experiments to fit the isotope–mass balance approach. Very low stoichiometric ratios of CH4/CO2 were measured in pore waters, but isotope mass balances revealed that 30–70% of the total CO2 measured was produced by methanogenesis. Mangrove soils receiving effluent discharges shifted the main methanogenesis pathway to CO2 reduction because of an increase in refractory organic matter. Isotope–mass balances of incubations indicated that methane was mainly oxidized by anaerobic oxidation of methane (AOM) coupled to sulfate reduction, and the increase in recalcitrant organic matter should fuel AOM as humus serves as a terminal electron acceptor. Since methanogenesis in mangrove soils is strongly controlled by the oxygen supply provided by mangrove roots, conservation of the forest plays a crucial role in mitigating greenhouse gas emissions. View Full-Text
Keywords: mangroves; methanogenesis; isotope–mass balance; CO2; CH4 mangroves; methanogenesis; isotope–mass balance; CO2; CH4
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MDPI and ACS Style

Sánchez-Carrillo, S.; Garatuza-Payan, J.; Sánchez-Andrés, R.; Cervantes, F.J.; Bartolomé, M.C.; Merino-Ibarra, M.; Thalasso, F. Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances. Water 2021, 13, 1867. https://doi.org/10.3390/w13131867

AMA Style

Sánchez-Carrillo S, Garatuza-Payan J, Sánchez-Andrés R, Cervantes FJ, Bartolomé MC, Merino-Ibarra M, Thalasso F. Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances. Water. 2021; 13(13):1867. https://doi.org/10.3390/w13131867

Chicago/Turabian Style

Sánchez-Carrillo, Salvador, Jaime Garatuza-Payan, Raquel Sánchez-Andrés, Francisco J. Cervantes, María C. Bartolomé, Martín Merino-Ibarra, and Frederic Thalasso. 2021. "Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances" Water 13, no. 13: 1867. https://doi.org/10.3390/w13131867

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