Boreal peatland C fluxes under varying permafrost regimes.

Discontinuous permafrost in peatlands has recently been melting across western Canada, creating wet Sphagnum-Carex lawns (internal lawns) interspersed within drier ombrotrophic bog. Permafrost degradation alters peat hydrology, thermal regimes and plant species assemblages, all of which could affect gaseous C emissions in peatlands. We quantified CO2 and CH4 fluxes across the peat-atmosphere boundary using dark static chambers in adjacent internal lawns, continental bogs and frost mounds in an area of localized permafrost in north-central Saskatchewan. Carbon dioxide and CH4 fluxes ranged from 0.2 to 14.6 mmol CO2 m-2 d-1 and from -24 to 344 umol CH4, respectively, and differed significantly among peatland types and sampling dates. Our estimates of CH4 flux are low compared to previous estimates from boreal wetlands, with net consumption of CH4 typically in frost mounds. Permafrost melt in our study area is associated with 1.6- and 30-fold increases in CO2 and CH4 emissions, respectively. More widespread thaw across the discontinuous permafrost region will be an important consideration to boreal C budgets with future climatic changes.

Main Author: Turetsky, Merritt.
Other Authors: Wieder, R Kelman., Vitt, Dale.
Language: English
Published: 2002
Online Access: http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:179255
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dc_source_str_mv Soil Biology and Biochemistry 34(7), July 2002, 907-912.
author Turetsky, Merritt.
author_facet_str_mv Turetsky, Merritt.
Wieder, R Kelman.
Vitt, Dale.
author_or_contributor_facet_str_mv Turetsky, Merritt.
Wieder, R Kelman.
Vitt, Dale.
author_s Turetsky, Merritt.
spellingShingle Turetsky, Merritt.
Boreal peatland C fluxes under varying permafrost regimes.
author-letter Turetsky, Merritt.
author_sort_str Turetsky, Merritt.
author2 Wieder, R Kelman.
Vitt, Dale.
author2Str Wieder, R Kelman.
Vitt, Dale.
dc_title_str Boreal peatland C fluxes under varying permafrost regimes.
title Boreal peatland C fluxes under varying permafrost regimes.
title_short Boreal peatland C fluxes under varying permafrost regimes.
title_full Boreal peatland C fluxes under varying permafrost regimes.
title_fullStr Boreal peatland C fluxes under varying permafrost regimes.
title_full_unstemmed Boreal peatland C fluxes under varying permafrost regimes.
collection_title_sort_str boreal peatland c fluxes under varying permafrost regimes.
title_sort boreal peatland c fluxes under varying permafrost regimes.
description Discontinuous permafrost in peatlands has recently been melting across western Canada, creating wet Sphagnum-Carex lawns (internal lawns) interspersed within drier ombrotrophic bog. Permafrost degradation alters peat hydrology, thermal regimes and plant species assemblages, all of which could affect gaseous C emissions in peatlands. We quantified CO2 and CH4 fluxes across the peat-atmosphere boundary using dark static chambers in adjacent internal lawns, continental bogs and frost mounds in an area of localized permafrost in north-central Saskatchewan. Carbon dioxide and CH4 fluxes ranged from 0.2 to 14.6 mmol CO2 m-2 d-1 and from -24 to 344 umol CH4, respectively, and differed significantly among peatland types and sampling dates. Our estimates of CH4 flux are low compared to previous estimates from boreal wetlands, with net consumption of CH4 typically in frost mounds. Permafrost melt in our study area is associated with 1.6- and 30-fold increases in CO2 and CH4 emissions, respectively. More widespread thaw across the discontinuous permafrost region will be an important consideration to boreal C budgets with future climatic changes.
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dc.title Boreal peatland C fluxes under varying permafrost regimes.
dc.creator Turetsky, Merritt.
Wieder, R Kelman.
Vitt, Dale.
dc.description Discontinuous permafrost in peatlands has recently been melting across western Canada, creating wet Sphagnum-Carex lawns (internal lawns) interspersed within drier ombrotrophic bog. Permafrost degradation alters peat hydrology, thermal regimes and plant species assemblages, all of which could affect gaseous C emissions in peatlands. We quantified CO2 and CH4 fluxes across the peat-atmosphere boundary using dark static chambers in adjacent internal lawns, continental bogs and frost mounds in an area of localized permafrost in north-central Saskatchewan. Carbon dioxide and CH4 fluxes ranged from 0.2 to 14.6 mmol CO2 m-2 d-1 and from -24 to 344 umol CH4, respectively, and differed significantly among peatland types and sampling dates. Our estimates of CH4 flux are low compared to previous estimates from boreal wetlands, with net consumption of CH4 typically in frost mounds. Permafrost melt in our study area is associated with 1.6- and 30-fold increases in CO2 and CH4 emissions, respectively. More widespread thaw across the discontinuous permafrost region will be an important consideration to boreal C budgets with future climatic changes.
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