Plant root carbon inputs drive methane production in tropical peatlands
Abstract Tropical peatlands are carbon-dense ecosystems that are significant sources of atmospheric methane (CH4). Recent work has demonstrated the importance of trees as an emission pathway for CH4 from the peat to the atmosphere. However, there remain questions over the processes of CH4 production...
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Nature Portfolio
2025-01-01
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| Online Access: | https://doi.org/10.1038/s41598-025-87467-w |
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| author | N. T. Girkin A. Siegenthaler O. Lopez A. Stott N. Ostle V. Gauci S. Sjögersten |
| author_facet | N. T. Girkin A. Siegenthaler O. Lopez A. Stott N. Ostle V. Gauci S. Sjögersten |
| author_sort | N. T. Girkin |
| collection | DOAJ |
| description | Abstract Tropical peatlands are carbon-dense ecosystems that are significant sources of atmospheric methane (CH4). Recent work has demonstrated the importance of trees as an emission pathway for CH4 from the peat to the atmosphere. However, there remain questions over the processes of CH4 production in these systems and how they relate to substrate supply. Principally, these questions relate to the relative contribution of recent photosynthetically fixed carbon, released as root exudates, versus carbon substrate supply from the slowly decomposing peat matrix to CH4 emissions within these ecosystems. Here, we examined the role of root inputs in regulating CH4 production inferred from soil emissions using a combination of in situ tree girdling, in situ13C natural abundance labelling via stem injections, and a 13CO2 labelling of transplanted plants of two contrasting plant functional types, a broadleaved evergreen tree, and a canopy palm. Girdling of broadleaved evergreen trees reduced CH4 fluxes by up to 67%. Stem injections of trees and palms with a natural abundance label resulted in significant isotopic enrichment of CH4 fluxes, reinforcing the link between root carbon inputs and peat CH4 fluxes. Ex situ 13CO2 labelling of plants resulted in significant 13C enrichment of peat CH4 fluxes. Taken together, our results demonstrate for the first time that plant root exudates make a substantial contribution to CH4 production in tropical peatlands. |
| format | Article |
| id | doaj-art-717027facf114d34ad9219a229199d70 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-717027facf114d34ad9219a229199d702025-01-26T12:33:19ZengNature PortfolioScientific Reports2045-23222025-01-0115111410.1038/s41598-025-87467-wPlant root carbon inputs drive methane production in tropical peatlandsN. T. Girkin0A. Siegenthaler1O. Lopez2A. Stott3N. Ostle4V. Gauci5S. Sjögersten6School of Biosciences, University of NottinghamSchool of Environment, Earth and Ecosystem Sciences, The Open UniversitySmithsonian Tropical Research InstituteCentre for Ecology and Hydrology, Lancaster Environment CentreLancaster Environment Centre, Lancaster UniversitySchool of Environment, Earth and Ecosystem Sciences, The Open UniversitySchool of Biosciences, University of NottinghamAbstract Tropical peatlands are carbon-dense ecosystems that are significant sources of atmospheric methane (CH4). Recent work has demonstrated the importance of trees as an emission pathway for CH4 from the peat to the atmosphere. However, there remain questions over the processes of CH4 production in these systems and how they relate to substrate supply. Principally, these questions relate to the relative contribution of recent photosynthetically fixed carbon, released as root exudates, versus carbon substrate supply from the slowly decomposing peat matrix to CH4 emissions within these ecosystems. Here, we examined the role of root inputs in regulating CH4 production inferred from soil emissions using a combination of in situ tree girdling, in situ13C natural abundance labelling via stem injections, and a 13CO2 labelling of transplanted plants of two contrasting plant functional types, a broadleaved evergreen tree, and a canopy palm. Girdling of broadleaved evergreen trees reduced CH4 fluxes by up to 67%. Stem injections of trees and palms with a natural abundance label resulted in significant isotopic enrichment of CH4 fluxes, reinforcing the link between root carbon inputs and peat CH4 fluxes. Ex situ 13CO2 labelling of plants resulted in significant 13C enrichment of peat CH4 fluxes. Taken together, our results demonstrate for the first time that plant root exudates make a substantial contribution to CH4 production in tropical peatlands.https://doi.org/10.1038/s41598-025-87467-wTropical peatMethaneStable isotope labellingGirdlingPLFA |
| spellingShingle | N. T. Girkin A. Siegenthaler O. Lopez A. Stott N. Ostle V. Gauci S. Sjögersten Plant root carbon inputs drive methane production in tropical peatlands Scientific Reports Tropical peat Methane Stable isotope labelling Girdling PLFA |
| title | Plant root carbon inputs drive methane production in tropical peatlands |
| title_full | Plant root carbon inputs drive methane production in tropical peatlands |
| title_fullStr | Plant root carbon inputs drive methane production in tropical peatlands |
| title_full_unstemmed | Plant root carbon inputs drive methane production in tropical peatlands |
| title_short | Plant root carbon inputs drive methane production in tropical peatlands |
| title_sort | plant root carbon inputs drive methane production in tropical peatlands |
| topic | Tropical peat Methane Stable isotope labelling Girdling PLFA |
| url | https://doi.org/10.1038/s41598-025-87467-w |
| work_keys_str_mv | AT ntgirkin plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT asiegenthaler plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT olopez plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT astott plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT nostle plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT vgauci plantrootcarboninputsdrivemethaneproductionintropicalpeatlands AT ssjogersten plantrootcarboninputsdrivemethaneproductionintropicalpeatlands |