The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada
International audience The microbial respiration of ancient permafrost carbon represents a positive feedback to climate warming. However, warming-induced shrub expansion in circumpolar latitudes may partly offset these emissions, due to greater biomass and litter inputs than that of primary tundra v...
Published in: | Environmental Research Communications |
---|---|
Main Authors: | , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
|
Subjects: | |
Online Access: | https://hal.science/hal-02393147 https://hal.science/hal-02393147/document https://hal.science/hal-02393147/file/124-GagnonERC2019-all.pdf https://doi.org/10.1088/2515-7620/ab3cdd |
id |
ftinsu:oai:HAL:hal-02393147v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-02393147v1 2023-06-18T03:38:55+02:00 The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada Gagnon, Mikael Dominé, Florent Boudreau, Stéphane Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2019 https://hal.science/hal-02393147 https://hal.science/hal-02393147/document https://hal.science/hal-02393147/file/124-GagnonERC2019-all.pdf https://doi.org/10.1088/2515-7620/ab3cdd en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1088/2515-7620/ab3cdd hal-02393147 https://hal.science/hal-02393147 https://hal.science/hal-02393147/document https://hal.science/hal-02393147/file/124-GagnonERC2019-all.pdf doi:10.1088/2515-7620/ab3cdd http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess Environ. Res. Commun https://hal.science/hal-02393147 Environ. Res. Commun, 2019, 1 (9), pp.091001. ⟨10.1088/2515-7620/ab3cdd⟩ carbon tundra shrub Arctic permafrost [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1088/2515-7620/ab3cdd 2023-06-05T23:25:38Z International audience The microbial respiration of ancient permafrost carbon represents a positive feedback to climate warming. However, warming-induced shrub expansion in circumpolar latitudes may partly offset these emissions, due to greater biomass and litter inputs than that of primary tundra vegetation. Quantifying this carbon sink is challenging as the simultaneous mineralization of ancient carbon renders the attribution of changes in soil carbon stocks uncertain. We measured the contribution of shrubs to the terrestrial carbon reservoir in a Low-Arctic region where ancient carbon stocks are among the lowest in the Arctic. The study site near the eastern shore of Hudson Bay is experiencing rapid Betula glandulosa Michx. expansion throughout lichen tundra. We find that the terrestrial carbon stocks (i.e. soil and vegetation) under a cover of low to medium-size shrubs is increased by 3.9±1.3 kg m −2 , regardless of shrub cover age. Along water tracks, taller shrubs and the transition to moss understories provide an even greater increase in terrestrial carbon (6.5±3.5 kg m −2). Using published maps of vegetation change from 1994 to 2010, we estimate that the carbon sink associated to shrub expansion in our study area (5.228 km 2) has been 2.4±0.8 Gg or 29±9 g m −2 yr −1. Extrapolating this result to the Arctic requires additional studies in representative environments. Article in Journal/Newspaper Arctic Hudson Bay permafrost Tundra Institut national des sciences de l'Univers: HAL-INSU Arctic Canada Hudson Hudson Bay Environmental Research Communications 1 9 091001 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
carbon tundra shrub Arctic permafrost [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
carbon tundra shrub Arctic permafrost [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes Gagnon, Mikael Dominé, Florent Boudreau, Stéphane The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
topic_facet |
carbon tundra shrub Arctic permafrost [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience The microbial respiration of ancient permafrost carbon represents a positive feedback to climate warming. However, warming-induced shrub expansion in circumpolar latitudes may partly offset these emissions, due to greater biomass and litter inputs than that of primary tundra vegetation. Quantifying this carbon sink is challenging as the simultaneous mineralization of ancient carbon renders the attribution of changes in soil carbon stocks uncertain. We measured the contribution of shrubs to the terrestrial carbon reservoir in a Low-Arctic region where ancient carbon stocks are among the lowest in the Arctic. The study site near the eastern shore of Hudson Bay is experiencing rapid Betula glandulosa Michx. expansion throughout lichen tundra. We find that the terrestrial carbon stocks (i.e. soil and vegetation) under a cover of low to medium-size shrubs is increased by 3.9±1.3 kg m −2 , regardless of shrub cover age. Along water tracks, taller shrubs and the transition to moss understories provide an even greater increase in terrestrial carbon (6.5±3.5 kg m −2). Using published maps of vegetation change from 1994 to 2010, we estimate that the carbon sink associated to shrub expansion in our study area (5.228 km 2) has been 2.4±0.8 Gg or 29±9 g m −2 yr −1. Extrapolating this result to the Arctic requires additional studies in representative environments. |
author2 |
Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Gagnon, Mikael Dominé, Florent Boudreau, Stéphane |
author_facet |
Gagnon, Mikael Dominé, Florent Boudreau, Stéphane |
author_sort |
Gagnon, Mikael |
title |
The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
title_short |
The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
title_full |
The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
title_fullStr |
The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
title_full_unstemmed |
The carbon sink due to shrub growth on Arctic tundra: a case study in a carbon-poor soil in eastern Canada |
title_sort |
carbon sink due to shrub growth on arctic tundra: a case study in a carbon-poor soil in eastern canada |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02393147 https://hal.science/hal-02393147/document https://hal.science/hal-02393147/file/124-GagnonERC2019-all.pdf https://doi.org/10.1088/2515-7620/ab3cdd |
geographic |
Arctic Canada Hudson Hudson Bay |
geographic_facet |
Arctic Canada Hudson Hudson Bay |
genre |
Arctic Hudson Bay permafrost Tundra |
genre_facet |
Arctic Hudson Bay permafrost Tundra |
op_source |
Environ. Res. Commun https://hal.science/hal-02393147 Environ. Res. Commun, 2019, 1 (9), pp.091001. ⟨10.1088/2515-7620/ab3cdd⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1088/2515-7620/ab3cdd hal-02393147 https://hal.science/hal-02393147 https://hal.science/hal-02393147/document https://hal.science/hal-02393147/file/124-GagnonERC2019-all.pdf doi:10.1088/2515-7620/ab3cdd |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1088/2515-7620/ab3cdd |
container_title |
Environmental Research Communications |
container_volume |
1 |
container_issue |
9 |
container_start_page |
091001 |
_version_ |
1769003763418267648 |