Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden
Abstract While substantial cold‐season respiration has been documented in most arctic and alpine ecosystems in recent years, the significance of cold‐season photosynthesis in these biomes is still believed to be small. In a mesic, subartic heath during both the cold and warm season, we measured in s...
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crwiley:10.1111/j.1365-2486.2007.01370.x 2024-09-09T19:26:17+00:00 Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden LARSEN, KLAUS STEENBERG IBROM, ANDREAS JONASSON, SVEN MICHELSEN, ANDERS BEIER, CLAUS 2007 http://dx.doi.org/10.1111/j.1365-2486.2007.01370.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2007.01370.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2007.01370.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 13, issue 7, page 1498-1508 ISSN 1354-1013 1365-2486 journal-article 2007 crwiley https://doi.org/10.1111/j.1365-2486.2007.01370.x 2024-08-09T04:27:33Z Abstract While substantial cold‐season respiration has been documented in most arctic and alpine ecosystems in recent years, the significance of cold‐season photosynthesis in these biomes is still believed to be small. In a mesic, subartic heath during both the cold and warm season, we measured in situ ecosystem respiration and photosynthesis with a chamber technique at ambient conditions and at artificially increased frequency of freeze–thaw (FT) cycles during fall and spring. We fitted the measured ecosystem exchange rates to respiration and photosynthesis models with R 2 ‐values ranging from 0.81 to 0.85. As expected, estimated cold‐season (October, November, April and May) respiration was significant and accounted for at least 22% of the annual respiratory CO 2 flux. More surprisingly, estimated photosynthesis during this period accounted for up to 19% of the annual gross CO 2 uptake, suggesting that cold‐season photosynthesis partly balanced the cold‐season respiratory carbon losses and can be significant for the annual cycle of carbon. Still, during the full year the ecosystem was a significant net source of 120 ± 12 g C m −2 to the atmosphere. Neither respiration nor photosynthetic rates were much affected by the extra FT cycles, although the mean rate of net ecosystem loss decreased slightly, but significantly, in May. The results suggest only a small response of net carbon fluxes to increased frequency of FT cycles in this ecosystem. Article in Journal/Newspaper Arctic Northern Sweden Subarctic Wiley Online Library Arctic Global Change Biology 13 7 1498 1508 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Abstract While substantial cold‐season respiration has been documented in most arctic and alpine ecosystems in recent years, the significance of cold‐season photosynthesis in these biomes is still believed to be small. In a mesic, subartic heath during both the cold and warm season, we measured in situ ecosystem respiration and photosynthesis with a chamber technique at ambient conditions and at artificially increased frequency of freeze–thaw (FT) cycles during fall and spring. We fitted the measured ecosystem exchange rates to respiration and photosynthesis models with R 2 ‐values ranging from 0.81 to 0.85. As expected, estimated cold‐season (October, November, April and May) respiration was significant and accounted for at least 22% of the annual respiratory CO 2 flux. More surprisingly, estimated photosynthesis during this period accounted for up to 19% of the annual gross CO 2 uptake, suggesting that cold‐season photosynthesis partly balanced the cold‐season respiratory carbon losses and can be significant for the annual cycle of carbon. Still, during the full year the ecosystem was a significant net source of 120 ± 12 g C m −2 to the atmosphere. Neither respiration nor photosynthetic rates were much affected by the extra FT cycles, although the mean rate of net ecosystem loss decreased slightly, but significantly, in May. The results suggest only a small response of net carbon fluxes to increased frequency of FT cycles in this ecosystem. |
format |
Article in Journal/Newspaper |
author |
LARSEN, KLAUS STEENBERG IBROM, ANDREAS JONASSON, SVEN MICHELSEN, ANDERS BEIER, CLAUS |
spellingShingle |
LARSEN, KLAUS STEENBERG IBROM, ANDREAS JONASSON, SVEN MICHELSEN, ANDERS BEIER, CLAUS Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
author_facet |
LARSEN, KLAUS STEENBERG IBROM, ANDREAS JONASSON, SVEN MICHELSEN, ANDERS BEIER, CLAUS |
author_sort |
LARSEN, KLAUS STEENBERG |
title |
Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
title_short |
Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
title_full |
Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
title_fullStr |
Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
title_full_unstemmed |
Significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in Northern Sweden |
title_sort |
significance of cold‐season respiration and photosynthesis in a subarctic heath ecosystem in northern sweden |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1111/j.1365-2486.2007.01370.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2007.01370.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2007.01370.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Northern Sweden Subarctic |
genre_facet |
Arctic Northern Sweden Subarctic |
op_source |
Global Change Biology volume 13, issue 7, page 1498-1508 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2486.2007.01370.x |
container_title |
Global Change Biology |
container_volume |
13 |
container_issue |
7 |
container_start_page |
1498 |
op_container_end_page |
1508 |
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1809895939456892928 |