Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances
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 δ<sup...
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MDPI AG
2021-07-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/13/13/1867 |
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| author | Salvador Sánchez-Carrillo Jaime Garatuza-Payan Raquel Sánchez-Andrés Francisco J. Cervantes María Carmen Bartolomé Martín Merino-Ibarra Frederic Thalasso |
| author_facet | Salvador Sánchez-Carrillo Jaime Garatuza-Payan Raquel Sánchez-Andrés Francisco J. Cervantes María Carmen Bartolomé Martín Merino-Ibarra Frederic Thalasso |
| author_sort | Salvador Sánchez-Carrillo |
| collection | DOAJ |
| description | 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 δ<sup>13</sup>C of dissolved inorganic carbon (DIC) and CH<sub>4</sub> were analyzed along with the δ<sup>13</sup>C of the soil organic matter to assess the proportion of CO<sub>2</sub> 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 CH<sub>4</sub>/CO<sub>2</sub> were measured in pore waters, but isotope mass balances revealed that 30–70% of the total CO<sub>2</sub> measured was produced by methanogenesis. Mangrove soils receiving effluent discharges shifted the main methanogenesis pathway to CO<sub>2</sub> 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. |
| first_indexed | 2024-03-10T09:48:55Z |
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| language | English |
| last_indexed | 2024-03-10T09:48:55Z |
| publishDate | 2021-07-01 |
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| record_format | Article |
| series | Water |
| spelling | doaj.art-809fdb4eacb24ae99888f6cfdbf8b1a22023-11-22T02:55:32ZengMDPI AGWater2073-44412021-07-011313186710.3390/w13131867Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass BalancesSalvador Sánchez-Carrillo0Jaime Garatuza-Payan1Raquel Sánchez-Andrés2Francisco J. Cervantes3María Carmen Bartolomé4Martín Merino-Ibarra5Frederic Thalasso6Department Biogeochemistry and Microbial Ecology, Museo Nacional de Ciencias Naturales-CSIC (MNCN-CSIC), Serrano 115 Bis, E-28006 Madrid, SpainDepartment Water and Environmental Sciences, Instituto Tecnológico de Sonora (ITSON), 5 de Febrero 818 Sur, Col. Centro, Ciudad Obregón CP. 85000, Sonora, MexicoSpatialTools, Clara del Rey 79, E-28002 Madrid, SpainLaboratory 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, MexicoFaculty Química y Farmacobiología, Universidad Michoacana de San Nicolás de Hidalgo (UMICH),Tzinzuntzan 173, Col. Matamoros, Morelia CP. 58030, Michoacán, MexicoInstituto 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, MexicoDepartamento 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, MexicoConsiderable 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 δ<sup>13</sup>C of dissolved inorganic carbon (DIC) and CH<sub>4</sub> were analyzed along with the δ<sup>13</sup>C of the soil organic matter to assess the proportion of CO<sub>2</sub> 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 CH<sub>4</sub>/CO<sub>2</sub> were measured in pore waters, but isotope mass balances revealed that 30–70% of the total CO<sub>2</sub> measured was produced by methanogenesis. Mangrove soils receiving effluent discharges shifted the main methanogenesis pathway to CO<sub>2</sub> 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.https://www.mdpi.com/2073-4441/13/13/1867mangrovesmethanogenesisisotope–mass balanceCO<sub>2</sub>CH<sub>4</sub> |
| spellingShingle | Salvador Sánchez-Carrillo Jaime Garatuza-Payan Raquel Sánchez-Andrés Francisco J. Cervantes María Carmen Bartolomé Martín Merino-Ibarra Frederic Thalasso Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances Water mangroves methanogenesis isotope–mass balance CO<sub>2</sub> CH<sub>4</sub> |
| title | Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances |
| title_full | Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances |
| title_fullStr | Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances |
| title_full_unstemmed | Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances |
| title_short | Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances |
| title_sort | methane production and oxidation in mangrove soils assessed by stable isotope mass balances |
| topic | mangroves methanogenesis isotope–mass balance CO<sub>2</sub> CH<sub>4</sub> |
| url | https://www.mdpi.com/2073-4441/13/13/1867 |
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