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Title: Neotropical peatland methane emissions along a vegetation and biogeochemical gradient

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Journal Article: Published Article
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Journal Volume: 12; Journal Issue: 10; Related Information: CHORUS Timestamp: 2017-10-20 13:40:17; Journal ID: ISSN 1932-6203
Public Library of Science (PLoS)
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Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., and Rinnan, ed., Riikka. Neotropical peatland methane emissions along a vegetation and biogeochemical gradient. United States: N. p., 2017. Web. doi:10.1371/journal.pone.0187019.
Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., & Rinnan, ed., Riikka. Neotropical peatland methane emissions along a vegetation and biogeochemical gradient. United States. doi:10.1371/journal.pone.0187019.
Winton, R. Scott, Flanagan, Neal, Richardson, Curtis J., and Rinnan, ed., Riikka. 2017. "Neotropical peatland methane emissions along a vegetation and biogeochemical gradient". United States. doi:10.1371/journal.pone.0187019.
title = {Neotropical peatland methane emissions along a vegetation and biogeochemical gradient},
author = {Winton, R. Scott and Flanagan, Neal and Richardson, Curtis J. and Rinnan, ed., Riikka},
abstractNote = {},
doi = {10.1371/journal.pone.0187019},
journal = {PLoS ONE},
number = 10,
volume = 12,
place = {United States},
year = 2017,
month =

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Publisher's Version of Record at 10.1371/journal.pone.0187019

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  • This study measured methane (CH{sub 4}) emissions by a static chamber technique from a wide range of sites (pH 3.9 - 7.0) in a peatland complex near Thompson, Manitoba in the Boreal Ecosystem - Atmosphere Study (BOREAS). The objectives were to identify environmental controls on CH{sub 4} emission rates, determine their spatial and temporal variability, and examine the change in CH{sub 4} emission associated with the evolution of permafrost, palsas, and collapse scars. Peak CH{sub 4} fluxes ranged from 0 in the palsas and treed peat islands to 1200 mg m{sup -2} d{sup -1} in the open sedge-rich fens andmore » saturated lagg areas of collapse scars, where permafrost was actively degrading. The greatest variability in fluxes occurred in flooded sites where ebullition was a transport mechanism. Depth to water table and peat temperature at the average water table position explained most of the variability in CH{sub 4} fluxes, with plant composition and density, substrate type, and the CH{sub 4} production/consumption potentials of the various peats as additional factors. CH{sub 4} flux did not vary with pH in the field since water table position and temperature were overriding controls.« less
  • The goals of this study were to: (1) measure methane (CH{sub 4}) emissions from peatland soils, (2) improve process models of peatland-atmospheric methane exchange by identifying environmental controls on methane emission, and (3) provide a method of extending CH{sub 4} emissions data from the laboratory to the landscape scale by determining the relationships between plant associations and CH{sub 4} flux. Sites representing a range of parameters were selected for CH{sub 4} sampling and analyses. Linear regression of concentration changes was used to calculate CH{sub 4} flux. In general, calculated methane emissions were larger than those reported for other boreal wetlandmore » sites at a similar latitude. The range of flux measurements showed spatial variation within and among sites as well as seasonal variation among sites. Open graminoid fens had the highest mean seasonal flux, while treed sites had the lowest mean flux. To determine the effects of environmental variables, data on seasonal patterns of water table position and peat temperature were collected and analyzed statistically. A correlation between peat temperature and water table position was observed. A predictive model for methane flux and environmental variables using multiple stepwise regression was developed. The model showed a negative correlation of CH{sub 4} flux with height above mean water table, and a weak correlation of flux with chemistry. The results of the study indicate that multivariate vegetation analyses may be a useful tool for accounting for environmental controls on methane flux and applying chamber measurements to the landscape scale using remote sensing. 43 refs., 8 figs., 3 tabs.« less
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