Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic
Summary Terrestrial biosphere models (TBMs) are highly sensitive to model representation of photosynthesis, in particular the parameters maximum carboxylation rate and maximum electron transport rate at 25°C ( V c,max.25 and J max.25 , respectively). Many TBMs do not include representation of Arctic...
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crwiley:10.1111/nph.14740 2024-09-30T14:29:28+00:00 Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic Rogers, Alistair Serbin, Shawn P. Ely, Kim S. Sloan, Victoria L. Wullschleger, Stan D. U.S. Department of Energy U.S. Department of Energy 2017 http://dx.doi.org/10.1111/nph.14740 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fnph.14740 https://onlinelibrary.wiley.com/doi/pdf/10.1111/nph.14740 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/nph.14740 https://nph.onlinelibrary.wiley.com/doi/am-pdf/10.1111/nph.14740 https://nph.onlinelibrary.wiley.com/doi/pdf/10.1111/nph.14740 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor http://doi.wiley.com/10.1002/tdm_license_1.1 http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor New Phytologist volume 216, issue 4, page 1090-1103 ISSN 0028-646X 1469-8137 journal-article 2017 crwiley https://doi.org/10.1111/nph.14740 2024-09-05T05:06:58Z Summary Terrestrial biosphere models (TBMs) are highly sensitive to model representation of photosynthesis, in particular the parameters maximum carboxylation rate and maximum electron transport rate at 25°C ( V c,max.25 and J max.25 , respectively). Many TBMs do not include representation of Arctic plants, and those that do rely on understanding and parameterization from temperate species. We measured photosynthetic CO 2 response curves and leaf nitrogen (N) content in species representing the dominant vascular plant functional types found on the coastal tundra near Barrow, Alaska. The activation energies associated with the temperature response functions of V c,max and J max were 17% lower than commonly used values. When scaled to 25°C, V c,max.25 and J max.25 were two‐ to five‐fold higher than the values used to parameterize current TBMs. This high photosynthetic capacity was attributable to a high leaf N content and the high fraction of N invested in Rubisco. Leaf‐level modeling demonstrated that current parameterization of TBMs resulted in a two‐fold underestimation of the capacity for leaf‐level CO 2 assimilation in Arctic vegetation. This study highlights the poor representation of Arctic photosynthesis in TBMs, and provides the critical data necessary to improve our ability to project the response of the Arctic to global environmental change. Article in Journal/Newspaper Arctic Barrow Tundra Alaska Wiley Online Library Arctic New Phytologist 216 4 1090 1103 |
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Wiley Online Library |
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English |
description |
Summary Terrestrial biosphere models (TBMs) are highly sensitive to model representation of photosynthesis, in particular the parameters maximum carboxylation rate and maximum electron transport rate at 25°C ( V c,max.25 and J max.25 , respectively). Many TBMs do not include representation of Arctic plants, and those that do rely on understanding and parameterization from temperate species. We measured photosynthetic CO 2 response curves and leaf nitrogen (N) content in species representing the dominant vascular plant functional types found on the coastal tundra near Barrow, Alaska. The activation energies associated with the temperature response functions of V c,max and J max were 17% lower than commonly used values. When scaled to 25°C, V c,max.25 and J max.25 were two‐ to five‐fold higher than the values used to parameterize current TBMs. This high photosynthetic capacity was attributable to a high leaf N content and the high fraction of N invested in Rubisco. Leaf‐level modeling demonstrated that current parameterization of TBMs resulted in a two‐fold underestimation of the capacity for leaf‐level CO 2 assimilation in Arctic vegetation. This study highlights the poor representation of Arctic photosynthesis in TBMs, and provides the critical data necessary to improve our ability to project the response of the Arctic to global environmental change. |
author2 |
U.S. Department of Energy U.S. Department of Energy |
format |
Article in Journal/Newspaper |
author |
Rogers, Alistair Serbin, Shawn P. Ely, Kim S. Sloan, Victoria L. Wullschleger, Stan D. |
spellingShingle |
Rogers, Alistair Serbin, Shawn P. Ely, Kim S. Sloan, Victoria L. Wullschleger, Stan D. Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
author_facet |
Rogers, Alistair Serbin, Shawn P. Ely, Kim S. Sloan, Victoria L. Wullschleger, Stan D. |
author_sort |
Rogers, Alistair |
title |
Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
title_short |
Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
title_full |
Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
title_fullStr |
Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
title_full_unstemmed |
Terrestrial biosphere models underestimate photosynthetic capacity and CO 2 assimilation in the Arctic |
title_sort |
terrestrial biosphere models underestimate photosynthetic capacity and co 2 assimilation in the arctic |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/nph.14740 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fnph.14740 https://onlinelibrary.wiley.com/doi/pdf/10.1111/nph.14740 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/nph.14740 https://nph.onlinelibrary.wiley.com/doi/am-pdf/10.1111/nph.14740 https://nph.onlinelibrary.wiley.com/doi/pdf/10.1111/nph.14740 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Barrow Tundra Alaska |
genre_facet |
Arctic Barrow Tundra Alaska |
op_source |
New Phytologist volume 216, issue 4, page 1090-1103 ISSN 0028-646X 1469-8137 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor http://doi.wiley.com/10.1002/tdm_license_1.1 http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/nph.14740 |
container_title |
New Phytologist |
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216 |
container_issue |
4 |
container_start_page |
1090 |
op_container_end_page |
1103 |
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1811634767481798656 |