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Neotropical peatland methane emissions along a vegetation and biogeochemical gradient.

dc.contributor.author Flanagan, Neal
dc.contributor.author Richardson, Curtis J
dc.contributor.author Winton, RS
dc.coverage.spatial United States
dc.date.accessioned 2017-11-01T13:56:18Z
dc.date.available 2017-11-01T13:56:18Z
dc.date.issued 2017
dc.identifier https://www.ncbi.nlm.nih.gov/pubmed/29053738
dc.identifier PONE-D-17-29413
dc.identifier.uri https://hdl.handle.net/10161/15696
dc.description.abstract Tropical wetlands are thought to be the most important source of interannual variability in atmospheric methane (CH4) concentrations, yet sparse data prevents them from being incorporated into Earth system models. This problem is particularly pronounced in the neotropics where bottom-up models based on water table depth are incongruent with top-down inversion models suggesting unaccounted sinks or sources of CH4. The newly documented vast areas of peatlands in the Amazon basin may account for an important unrecognized CH4 source, but the hydrologic and biogeochemical controls of CH4 dynamics from these systems remain poorly understood. We studied three zones of a peatland in Madre de Dios, Peru, to test whether CH4 emissions and pore water concentrations varied with vegetation community, soil chemistry and proximity to groundwater sources. We found that the open-canopy herbaceous zone emitted roughly one-third as much CH4 as the Mauritia flexuosa palm-dominated areas (4.7 ± 0.9 and 14.0 ± 2.4 mg CH4 m-2 h-1, respectively). Emissions decreased with distance from groundwater discharge across the three sampling sites, and tracked changes in soil carbon chemistry, especially increased soil phenolics. Based on all available data, we calculate that neotropical peatlands contribute emissions of 43 ± 11.9 Tg CH4 y-1, however this estimate is subject to geographic bias and will need revision once additional studies are published.
dc.language eng
dc.relation.ispartof PLoS One
dc.relation.isversionof 10.1371/journal.pone.0187019
dc.title Neotropical peatland methane emissions along a vegetation and biogeochemical gradient.
dc.type Journal article
pubs.author-url https://www.ncbi.nlm.nih.gov/pubmed/29053738
pubs.begin-page e0187019
pubs.issue 10
pubs.organisational-group Duke
pubs.organisational-group Environmental Sciences and Policy
pubs.organisational-group Marine Science and Conservation
pubs.organisational-group Nicholas School of the Environment
pubs.publication-status Published online
pubs.volume 12
dc.identifier.eissn 1932-6203


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