Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the western Amazon basin

Yit Arn Teh, Murphy Wayne, Juan-Carlos Berrio, Arnoud Boom, Susan E Page

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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.
Original languageEnglish
Pages (from-to)3669-3683
Number of pages15
JournalBiogeosciences
Volume14
Early online date24 Feb 2017
DOIs
Publication statusPublished - 7 Aug 2017

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peatlands
swamps
nitrous oxide
peatland
swamp
methane
seasonal variation
basins
vegetation
basin
wet season
dry season
foreland basin
methane production
vegetation types
vegetation type
ecosystems
ecosystem
trace gas
Peru

Keywords

  • methane
  • nitrous oxide
  • peat
  • tropical peatland
  • Amazonia
  • Peru

Cite this

Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the western Amazon basin. / Teh, Yit Arn; Wayne, Murphy; Berrio, Juan-Carlos; Boom, Arnoud; Page, Susan E.

In: Biogeosciences, Vol. 14, 07.08.2017, p. 3669-3683.

Research output: Contribution to journalArticle

Teh, Yit Arn ; Wayne, Murphy ; Berrio, Juan-Carlos ; Boom, Arnoud ; Page, Susan E. / Seasonal variability in methane and nitrous oxide fluxes from tropical peatlands in the western Amazon basin. In: Biogeosciences. 2017 ; Vol. 14. pp. 3669-3683.
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abstract = "Here we report methane (CH4) and nitrous oxide (N2O) fluxes from lowland tropical peatlands in the Pastaza-Mara{\~n}{\'o}n 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.",
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AU - Wayne, Murphy

AU - Berrio, Juan-Carlos

AU - Boom, Arnoud

AU - Page, Susan E

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N2 - 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.

AB - 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.

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KW - nitrous oxide

KW - peat

KW - tropical peatland

KW - Amazonia

KW - Peru

U2 - 10.5194/bg-2017-48

DO - 10.5194/bg-2017-48

M3 - Article

VL - 14

SP - 3669

EP - 3683

JO - Biogeosciences

JF - Biogeosciences

SN - 1726-4170

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