Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/bg-2017-48
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
24 Feb 2017
Review status
This discussion paper is under review for the journal Biogeosciences (BG).
Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the Western Amazon basin
Yit Arn Teh1, Wayne A. Murphy2, Juan-Carlos Berrio2, Arnoud Boom2, and Susan E. Page2 1Institute of Biological and Environmental Sciences, University of Aberdeen
2Department of Geography, University of Leicester
Abstract. Here we report methane (CH4) and nitrous oxide (N2O) fluxes from lowland tropical peatlands in the Pastaza-Marañón foreland basin (PMFB) in Peru, one of the largest peatland complexes in the Amazon basin. Trace gas fluxes were sampled from the most numerically-dominant peatland vegetation types in the region: forested vegetation, forested (short pole) vegetation, Mauritia flexuosa-dominated palm swamp, and mixed palm swamp. Data were collected in both wet and dry seasons over the course of four field campaigns from 2012 to 2014. Peatlands in the PMFB were large and regionally significant sources of atmospheric CH4, emitting 36.05 ± 3.09 mg CH4-C m−2 d−1. CH4 emissions varied significantly among vegetation types and between seasons. CH4 fluxes were greatest for mixed palm swamp (52.0 ± 16.0 mg CH4-C m−2 d−1), followed by M. flexuosa palm swamp (36.7 ± 3.9 mg CH4-C m−2 d−1), forested (short pole) vegetation (31.6 ± 6.6 mg CH4-C m−2 d−1), and forested vegetation (29.8 ± 10.0 mg CH4-C m−2 d−1). CH4 fluxes also showed marked seasonality, with divergent seasonal flux patterns among ecosystems. Forested vegetation and mixed palm swamp showed significantly higher dry season (47.2 ± 5.4 mg CH4-C m−2 d−1 and 85.5 ± 26.4 mg CH4-C m−2 d−1, respectively) compared to wet season emissions (6.8 ± 1.0 mg CH4-C m−2 d−1 and 5.2 ± 2.7 mg CH4-C m−2 d−1, respectively). In contrast, forested (short pole) vegetation and M. flexuosa palm swamp showed the opposite trend, with dry season fluxes of 9.6 ± 2.6 and 25.5 ± 2.9 mg CH4C m−2 d−1, respectively, versus wet season fluxes of 103.4 ± 13.6 and 53.4 ± 9.8 mg CH4-C m−2 d−1, respectively. Nitrous oxide fluxes were negligible (0.70 ± 0.34 µg N2O-N m−2 d−1), and did not vary significantly among ecosystems or between seasons.

Citation: Teh, Y. A., Murphy, W. A., Berrio, J.-C., Boom, A., and Page, S. E.: Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the Western Amazon basin, Biogeosciences Discuss., doi:10.5194/bg-2017-48, in review, 2017.
Yit Arn Teh et al.
Yit Arn Teh et al.
Yit Arn Teh et al.

Viewed

Total article views: 190 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
149 28 13 190 2 12

Views and downloads (calculated since 24 Feb 2017)

Cumulative views and downloads (calculated since 24 Feb 2017)

Viewed (geographical distribution)

Total article views: 190 (including HTML, PDF, and XML)

Thereof 190 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 29 Mar 2017
Publications Copernicus
Download
Short summary
Peatlands in the Pastaza-Marañón foreland basin in Peru, one of the largest peatland complexes in the Amazon basin, were found to be large sources of methane, and may make important contributions to regional and global budgets of this greenhouse gas. Methane showed uneven seasonal trends in emissions, with some ecosystems emitting more methane during the dry season compared to the wet season.
Peatlands in the Pastaza-Marañón foreland basin in Peru, one of the largest peatland complexes...
Share