A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen
Abstract Tundra ecosystems are global belowground sinks for atmospheric CO 2 . Ongoing warming‐induced encroachment by shrubs and trees risks turning this sink into a CO 2 source, resulting in a positive feedback on climate warming. To advance mechanistic understanding of how shifts in mycorrhizal t...
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crwiley:10.1111/ele.13735 2024-09-30T14:31:04+00:00 A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen Clemmensen, Karina Engelbrecht Durling, Mikael Brandström Michelsen, Anders Hallin, Sara Finlay, Roger D. Lindahl, Björn D. Liu, Lingli 2021 http://dx.doi.org/10.1111/ele.13735 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ele.13735 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ele.13735 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Ecology Letters volume 24, issue 6, page 1193-1204 ISSN 1461-023X 1461-0248 journal-article 2021 crwiley https://doi.org/10.1111/ele.13735 2024-09-17T04:49:11Z Abstract Tundra ecosystems are global belowground sinks for atmospheric CO 2 . Ongoing warming‐induced encroachment by shrubs and trees risks turning this sink into a CO 2 source, resulting in a positive feedback on climate warming. To advance mechanistic understanding of how shifts in mycorrhizal types affect long‐term carbon (C) and nitrogen (N) stocks, we studied small‐scale soil depth profiles of fungal communities and C–N dynamics across a subarctic‐alpine forest‐heath vegetation gradient. Belowground organic stocks decreased abruptly at the transition from heath to forest, linked to the presence of certain tree‐associated ectomycorrhizal fungi that contribute to decomposition when mining N from organic matter. In contrast, ericoid mycorrhizal plants and fungi were associated with organic matter accumulation and slow decomposition. If climatic controls on arctic‐alpine forest lines are relaxed, increased decomposition will likely outbalance increased plant productivity, decreasing the overall C sink capacity of displaced tundra. Article in Journal/Newspaper Arctic Subarctic Tundra Wiley Online Library Arctic Ecology Letters 24 6 1193 1204 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Tundra ecosystems are global belowground sinks for atmospheric CO 2 . Ongoing warming‐induced encroachment by shrubs and trees risks turning this sink into a CO 2 source, resulting in a positive feedback on climate warming. To advance mechanistic understanding of how shifts in mycorrhizal types affect long‐term carbon (C) and nitrogen (N) stocks, we studied small‐scale soil depth profiles of fungal communities and C–N dynamics across a subarctic‐alpine forest‐heath vegetation gradient. Belowground organic stocks decreased abruptly at the transition from heath to forest, linked to the presence of certain tree‐associated ectomycorrhizal fungi that contribute to decomposition when mining N from organic matter. In contrast, ericoid mycorrhizal plants and fungi were associated with organic matter accumulation and slow decomposition. If climatic controls on arctic‐alpine forest lines are relaxed, increased decomposition will likely outbalance increased plant productivity, decreasing the overall C sink capacity of displaced tundra. |
author2 |
Liu, Lingli |
format |
Article in Journal/Newspaper |
author |
Clemmensen, Karina Engelbrecht Durling, Mikael Brandström Michelsen, Anders Hallin, Sara Finlay, Roger D. Lindahl, Björn D. |
spellingShingle |
Clemmensen, Karina Engelbrecht Durling, Mikael Brandström Michelsen, Anders Hallin, Sara Finlay, Roger D. Lindahl, Björn D. A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
author_facet |
Clemmensen, Karina Engelbrecht Durling, Mikael Brandström Michelsen, Anders Hallin, Sara Finlay, Roger D. Lindahl, Björn D. |
author_sort |
Clemmensen, Karina Engelbrecht |
title |
A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
title_short |
A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
title_full |
A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
title_fullStr |
A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
title_full_unstemmed |
A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
title_sort |
tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/ele.13735 https://onlinelibrary.wiley.com/doi/pdf/10.1111/ele.13735 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ele.13735 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic Tundra |
genre_facet |
Arctic Subarctic Tundra |
op_source |
Ecology Letters volume 24, issue 6, page 1193-1204 ISSN 1461-023X 1461-0248 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/ele.13735 |
container_title |
Ecology Letters |
container_volume |
24 |
container_issue |
6 |
container_start_page |
1193 |
op_container_end_page |
1204 |
_version_ |
1811635736338759680 |