Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species
Premise of the study: Consequences of global climate change are detectable in the historically nitrogen- and phosphorus-limited Arctic tundra landscape and have implications for the terrestrial carbon cycle. Warmer temperatures and elevated soil nutrient availability associated with increased microb...
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Columbia University
2012
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ftdatacite:10.7916/d8805cbf 2023-05-15T14:59:22+02:00 Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species Heskel, Mary Allison Anderson, O. Roger Atkin, Owen K. Turnbull, Matthew H. Griffin, Kevin L. 2012 https://dx.doi.org/10.7916/d8805cbf https://academiccommons.columbia.edu/doi/10.7916/D8805CBF unknown Columbia University Carbon cycle Biogeochemistry Tundra ecology Tundra plants Botany Climatic changes Text Articles article-journal ScholarlyArticle 2012 ftdatacite https://doi.org/10.7916/d8805cbf 2021-11-05T12:55:41Z Premise of the study: Consequences of global climate change are detectable in the historically nitrogen- and phosphorus-limited Arctic tundra landscape and have implications for the terrestrial carbon cycle. Warmer temperatures and elevated soil nutrient availability associated with increased microbial activity may influence rates of photosynthesis and respiration. Methods: This study examined leaf-level gas exchange, cellular ultrastructure, and related leaf traits in two dominant tundra species, Betula nana, a woody shrub, and Eriophorum vaginatum, a tussock sedge, under a 3-yr-old treatment gradient of nitrogen (N) and phosphorus (P) fertilization in the North Slope of Alaska. Key results: Respiration increased with N and P addition—the highest rates corresponding to the highest concentrations of leaf N in both species. The inhibition of respiration by light ("Kok effect") significantly reduced respiration rates in both species (P < 0.001), ranged from 12–63% (mean 34%), and generally decreased with fertilization for both species. However, in both species, observed rates of photosynthesis did not increase, and photosynthetic nitrogen use efficiency generally decreased under increasing fertilization. Chloroplast and mitochondrial size and density were highly sensitive to N and P fertilization (P < 0.001), though species interactions indicated divergent cellular organizational strategies. Conclusions: Results from this study demonstrate a species-specific decoupling of respiration and photosynthesis under N and P fertilization, implying an alteration of the carbon balance of the tundra ecosystem under future conditions. Text Arctic Betula nana Climate change Eriophorum north slope Tundra Alaska DataCite Metadata Store (German National Library of Science and Technology) Arctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Carbon cycle Biogeochemistry Tundra ecology Tundra plants Botany Climatic changes |
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Carbon cycle Biogeochemistry Tundra ecology Tundra plants Botany Climatic changes Heskel, Mary Allison Anderson, O. Roger Atkin, Owen K. Turnbull, Matthew H. Griffin, Kevin L. Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
topic_facet |
Carbon cycle Biogeochemistry Tundra ecology Tundra plants Botany Climatic changes |
description |
Premise of the study: Consequences of global climate change are detectable in the historically nitrogen- and phosphorus-limited Arctic tundra landscape and have implications for the terrestrial carbon cycle. Warmer temperatures and elevated soil nutrient availability associated with increased microbial activity may influence rates of photosynthesis and respiration. Methods: This study examined leaf-level gas exchange, cellular ultrastructure, and related leaf traits in two dominant tundra species, Betula nana, a woody shrub, and Eriophorum vaginatum, a tussock sedge, under a 3-yr-old treatment gradient of nitrogen (N) and phosphorus (P) fertilization in the North Slope of Alaska. Key results: Respiration increased with N and P addition—the highest rates corresponding to the highest concentrations of leaf N in both species. The inhibition of respiration by light ("Kok effect") significantly reduced respiration rates in both species (P < 0.001), ranged from 12–63% (mean 34%), and generally decreased with fertilization for both species. However, in both species, observed rates of photosynthesis did not increase, and photosynthetic nitrogen use efficiency generally decreased under increasing fertilization. Chloroplast and mitochondrial size and density were highly sensitive to N and P fertilization (P < 0.001), though species interactions indicated divergent cellular organizational strategies. Conclusions: Results from this study demonstrate a species-specific decoupling of respiration and photosynthesis under N and P fertilization, implying an alteration of the carbon balance of the tundra ecosystem under future conditions. |
format |
Text |
author |
Heskel, Mary Allison Anderson, O. Roger Atkin, Owen K. Turnbull, Matthew H. Griffin, Kevin L. |
author_facet |
Heskel, Mary Allison Anderson, O. Roger Atkin, Owen K. Turnbull, Matthew H. Griffin, Kevin L. |
author_sort |
Heskel, Mary Allison |
title |
Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
title_short |
Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
title_full |
Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
title_fullStr |
Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
title_full_unstemmed |
Leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two Arctic tundra species |
title_sort |
leaf- and cell-level carbon cycling responses to a nitrogen and phosphorus gradient in two arctic tundra species |
publisher |
Columbia University |
publishDate |
2012 |
url |
https://dx.doi.org/10.7916/d8805cbf https://academiccommons.columbia.edu/doi/10.7916/D8805CBF |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Betula nana Climate change Eriophorum north slope Tundra Alaska |
genre_facet |
Arctic Betula nana Climate change Eriophorum north slope Tundra Alaska |
op_doi |
https://doi.org/10.7916/d8805cbf |
_version_ |
1766331475929595904 |