The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover
Abstract A significant warming effect on arctic tundra is greening. Although this increase in predominantly woody vegetation has been linked to increases in gross primary productivity, increasing temperatures also stimulate ecosystem respiration. We present a novel analysis from small-scale plot mea...
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ftdoajarticles:oai:doaj.org/article:7097e8acc2fa47f1acd8c1ce5d71e077 2024-09-15T17:52:40+00:00 The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover Elizabeth Min Natalie T. Boelman Laura Gough Jennie R. McLaren Edward B. Rastetter Rebecca J. Rowe Adrian Rocha Matthew H. Turnbull Kevin L. Griffin 2024-08-01T00:00:00Z https://doi.org/10.1038/s42003-024-06600-z https://doaj.org/article/7097e8acc2fa47f1acd8c1ce5d71e077 EN eng Nature Portfolio https://doi.org/10.1038/s42003-024-06600-z https://doaj.org/toc/2399-3642 doi:10.1038/s42003-024-06600-z 2399-3642 https://doaj.org/article/7097e8acc2fa47f1acd8c1ce5d71e077 Communications Biology, Vol 7, Iss 1, Pp 1-7 (2024) Biology (General) QH301-705.5 article 2024 ftdoajarticles https://doi.org/10.1038/s42003-024-06600-z 2024-08-12T15:24:01Z Abstract A significant warming effect on arctic tundra is greening. Although this increase in predominantly woody vegetation has been linked to increases in gross primary productivity, increasing temperatures also stimulate ecosystem respiration. We present a novel analysis from small-scale plot measurements showing that the shape of the temperature- and light-dependent sink-to-source threshold (where net ecosystem exchange (NEE) equals zero) differs between two tussock tundra ecosystems differing in leaf area index (LAI). At the higher LAI site, the threshold is exceeded (i.e the ecosystem becomes a source) at relatively higher temperatures under low light but at lower temperatures under high light. At the lower LAI site, the threshold is exceeded at relatively lower temperatures under low light but at higher temperatures under high light. We confirmed this response at a single site where LAI was experimentally increased. This suggests the carbon balance of the tundra may be sensitive to small increases in temperature under low light, but that this effect may be significantly offset by increases in LAI. Importantly, we found that this LAI effect is reversed under high light, and so in a warming tundra, greater vegetation cover could have a progressively negative effect on net carbon uptake. Article in Journal/Newspaper Arctic Greening Tundra Directory of Open Access Journals: DOAJ Articles Communications Biology 7 1 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Biology (General) QH301-705.5 |
spellingShingle |
Biology (General) QH301-705.5 Elizabeth Min Natalie T. Boelman Laura Gough Jennie R. McLaren Edward B. Rastetter Rebecca J. Rowe Adrian Rocha Matthew H. Turnbull Kevin L. Griffin The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
topic_facet |
Biology (General) QH301-705.5 |
description |
Abstract A significant warming effect on arctic tundra is greening. Although this increase in predominantly woody vegetation has been linked to increases in gross primary productivity, increasing temperatures also stimulate ecosystem respiration. We present a novel analysis from small-scale plot measurements showing that the shape of the temperature- and light-dependent sink-to-source threshold (where net ecosystem exchange (NEE) equals zero) differs between two tussock tundra ecosystems differing in leaf area index (LAI). At the higher LAI site, the threshold is exceeded (i.e the ecosystem becomes a source) at relatively higher temperatures under low light but at lower temperatures under high light. At the lower LAI site, the threshold is exceeded at relatively lower temperatures under low light but at higher temperatures under high light. We confirmed this response at a single site where LAI was experimentally increased. This suggests the carbon balance of the tundra may be sensitive to small increases in temperature under low light, but that this effect may be significantly offset by increases in LAI. Importantly, we found that this LAI effect is reversed under high light, and so in a warming tundra, greater vegetation cover could have a progressively negative effect on net carbon uptake. |
format |
Article in Journal/Newspaper |
author |
Elizabeth Min Natalie T. Boelman Laura Gough Jennie R. McLaren Edward B. Rastetter Rebecca J. Rowe Adrian Rocha Matthew H. Turnbull Kevin L. Griffin |
author_facet |
Elizabeth Min Natalie T. Boelman Laura Gough Jennie R. McLaren Edward B. Rastetter Rebecca J. Rowe Adrian Rocha Matthew H. Turnbull Kevin L. Griffin |
author_sort |
Elizabeth Min |
title |
The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
title_short |
The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
title_full |
The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
title_fullStr |
The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
title_full_unstemmed |
The give and take of Arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
title_sort |
give and take of arctic greening: differential responses of the carbon sink-to-source threshold to light and temperature in tussock tundra may be influenced by vegetation cover |
publisher |
Nature Portfolio |
publishDate |
2024 |
url |
https://doi.org/10.1038/s42003-024-06600-z https://doaj.org/article/7097e8acc2fa47f1acd8c1ce5d71e077 |
genre |
Arctic Greening Tundra |
genre_facet |
Arctic Greening Tundra |
op_source |
Communications Biology, Vol 7, Iss 1, Pp 1-7 (2024) |
op_relation |
https://doi.org/10.1038/s42003-024-06600-z https://doaj.org/toc/2399-3642 doi:10.1038/s42003-024-06600-z 2399-3642 https://doaj.org/article/7097e8acc2fa47f1acd8c1ce5d71e077 |
op_doi |
https://doi.org/10.1038/s42003-024-06600-z |
container_title |
Communications Biology |
container_volume |
7 |
container_issue |
1 |
_version_ |
1810294707070173184 |