Wetland succession in a permafrost collapse: interactions between fire and thermokarst
International audience To determine the influence of fire and thermokarst in a boreal landscape, we investigated ~600 years of vegetation succession from peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom ass...
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ftccsdartic:oai:HAL:hal-00297949v1 2023-11-12T04:24:31+01:00 Wetland succession in a permafrost collapse: interactions between fire and thermokarst Myers-Smith, I. H. Harden, J. W. Wilmking, M. Fuller, C. C. Mcguire, A. D. Chapin Iii, F. S. Institute of Arctic Biology University of Alaska Fairbanks (UAF) United States Geological Survey Reston (USGS) Institute for Botany and Landscape Ecology Grimmer Strasse 88 Alaska Cooperative Fish and Wildlife Research Unit (akcfwru) United States Geological Survey Reston (USGS)-University of Alaska Fairbanks (UAF) 2007-11-30 https://hal.science/hal-00297949 https://hal.science/hal-00297949/document https://hal.science/hal-00297949/file/bgd-4-4507-2007.pdf en eng HAL CCSD European Geosciences Union hal-00297949 https://hal.science/hal-00297949 https://hal.science/hal-00297949/document https://hal.science/hal-00297949/file/bgd-4-4507-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00297949 Biogeosciences Discussions, 2007, 4 (6), pp.4507-4538 [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2023-10-21T23:15:35Z International audience To determine the influence of fire and thermokarst in a boreal landscape, we investigated ~600 years of vegetation succession from peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and nitrogen content of the peat profile indicate that succession proceeded from a terrestrial forest to a sedge-dominated wetland over 100 years ago and to a Sphagnum -dominated bog in approximately 1970. The shift from sedge to Sphagnum , and a decrease in the detrended tree-ring width index of black spruce trees adjacent to the collapse coincided with an increase in the growing season temperature record from Fairbanks. The concurrent wetland succession and reduced growth of black spruce trees indicates a non-linear ecosystem-level response to a change in regional climate. In 2001, fire was observed coincident with permafrost collapse and resulted in lateral expansion of the bog. These observations and the peat profile suggest that future warming and/or increased fire disturbance could promote permafrost degradation and bog expansion, and increase carbon storage in the collapse; however, the development of drought conditions could reduce the success of black spruce and Sphagnum , decreasing long-term ecosystem carbon storage in the adjacent landscape. Article in Journal/Newspaper permafrost Thermokarst Alaska Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Fairbanks |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Myers-Smith, I. H. Harden, J. W. Wilmking, M. Fuller, C. C. Mcguire, A. D. Chapin Iii, F. S. Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience To determine the influence of fire and thermokarst in a boreal landscape, we investigated ~600 years of vegetation succession from peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and nitrogen content of the peat profile indicate that succession proceeded from a terrestrial forest to a sedge-dominated wetland over 100 years ago and to a Sphagnum -dominated bog in approximately 1970. The shift from sedge to Sphagnum , and a decrease in the detrended tree-ring width index of black spruce trees adjacent to the collapse coincided with an increase in the growing season temperature record from Fairbanks. The concurrent wetland succession and reduced growth of black spruce trees indicates a non-linear ecosystem-level response to a change in regional climate. In 2001, fire was observed coincident with permafrost collapse and resulted in lateral expansion of the bog. These observations and the peat profile suggest that future warming and/or increased fire disturbance could promote permafrost degradation and bog expansion, and increase carbon storage in the collapse; however, the development of drought conditions could reduce the success of black spruce and Sphagnum , decreasing long-term ecosystem carbon storage in the adjacent landscape. |
author2 |
Institute of Arctic Biology University of Alaska Fairbanks (UAF) United States Geological Survey Reston (USGS) Institute for Botany and Landscape Ecology Grimmer Strasse 88 Alaska Cooperative Fish and Wildlife Research Unit (akcfwru) United States Geological Survey Reston (USGS)-University of Alaska Fairbanks (UAF) |
format |
Article in Journal/Newspaper |
author |
Myers-Smith, I. H. Harden, J. W. Wilmking, M. Fuller, C. C. Mcguire, A. D. Chapin Iii, F. S. |
author_facet |
Myers-Smith, I. H. Harden, J. W. Wilmking, M. Fuller, C. C. Mcguire, A. D. Chapin Iii, F. S. |
author_sort |
Myers-Smith, I. H. |
title |
Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
title_short |
Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
title_full |
Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
title_fullStr |
Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
title_full_unstemmed |
Wetland succession in a permafrost collapse: interactions between fire and thermokarst |
title_sort |
wetland succession in a permafrost collapse: interactions between fire and thermokarst |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00297949 https://hal.science/hal-00297949/document https://hal.science/hal-00297949/file/bgd-4-4507-2007.pdf |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
permafrost Thermokarst Alaska |
genre_facet |
permafrost Thermokarst Alaska |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00297949 Biogeosciences Discussions, 2007, 4 (6), pp.4507-4538 |
op_relation |
hal-00297949 https://hal.science/hal-00297949 https://hal.science/hal-00297949/document https://hal.science/hal-00297949/file/bgd-4-4507-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782338992221454336 |