Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland
Increased soil nutrient availability, and associated increases in vegetation productivity, could create a negative feedback between Arctic ecosystems and the climate system, thereby reducing the contribution of Arctic ecosystems to future climate change. To predict whether this feedback will develop...
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Canadian Science Publishing
2023
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crcansciencepubl:10.1139/as-2022-0048 2023-12-17T10:22:42+01:00 Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland Hung, Jacqueline K.Y. Scott, Neal A. Treitz, Paul M. Natural Sciences and Engineering Research Council of Canada 2023 http://dx.doi.org/10.1139/as-2022-0048 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2022-0048 https://cdnsciencepub.com/doi/pdf/10.1139/as-2022-0048 en eng Canadian Science Publishing https://creativecommons.org/licenses/by/4.0/deed.en_GB Arctic Science ISSN 2368-7460 General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science journal-article 2023 crcansciencepubl https://doi.org/10.1139/as-2022-0048 2023-11-19T13:38:51Z Increased soil nutrient availability, and associated increases in vegetation productivity, could create a negative feedback between Arctic ecosystems and the climate system, thereby reducing the contribution of Arctic ecosystems to future climate change. To predict whether this feedback will develop, it is important to understand the environmental controls over nutrient cycling in High Arctic ecosystems and their impact on carbon cycling processes. Here, we examined the environmental controls over soil nitrogen availability in a High Arctic wet sedge meadow and how abiotic factors and soil nitrogen influenced carbon dioxide exchange processes. The importance of environmental variables was consistent over the 3 years, but the magnitudes of their effect varied depending on climate conditions. Ammonium availability was higher in warmer years and wetter conditions, while drier areas within the wetland had higher nitrate availability. Carbon uptake was driven by soil moisture, active layer depth, and variability between sampling sites and years ( R 2 = 0.753), while ecosystem respiration was influenced by nitrogen availability, soil temperature, active layer depth, and sampling year ( R 2 = 0.848). Considered together, the future carbon dioxide source or sink potential of high latitude wetlands will largely depend on climate-induced changes in moisture and subsequent impacts on nutrient availability. Article in Journal/Newspaper Arctic Arctic Climate change Canadian Science Publishing (via Crossref) Arctic Arctic Science |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science Hung, Jacqueline K.Y. Scott, Neal A. Treitz, Paul M. Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
topic_facet |
General Earth and Planetary Sciences General Agricultural and Biological Sciences General Environmental Science |
description |
Increased soil nutrient availability, and associated increases in vegetation productivity, could create a negative feedback between Arctic ecosystems and the climate system, thereby reducing the contribution of Arctic ecosystems to future climate change. To predict whether this feedback will develop, it is important to understand the environmental controls over nutrient cycling in High Arctic ecosystems and their impact on carbon cycling processes. Here, we examined the environmental controls over soil nitrogen availability in a High Arctic wet sedge meadow and how abiotic factors and soil nitrogen influenced carbon dioxide exchange processes. The importance of environmental variables was consistent over the 3 years, but the magnitudes of their effect varied depending on climate conditions. Ammonium availability was higher in warmer years and wetter conditions, while drier areas within the wetland had higher nitrate availability. Carbon uptake was driven by soil moisture, active layer depth, and variability between sampling sites and years ( R 2 = 0.753), while ecosystem respiration was influenced by nitrogen availability, soil temperature, active layer depth, and sampling year ( R 2 = 0.848). Considered together, the future carbon dioxide source or sink potential of high latitude wetlands will largely depend on climate-induced changes in moisture and subsequent impacts on nutrient availability. |
author2 |
Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Hung, Jacqueline K.Y. Scott, Neal A. Treitz, Paul M. |
author_facet |
Hung, Jacqueline K.Y. Scott, Neal A. Treitz, Paul M. |
author_sort |
Hung, Jacqueline K.Y. |
title |
Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
title_short |
Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
title_full |
Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
title_fullStr |
Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
title_full_unstemmed |
Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland |
title_sort |
drivers of soil nitrogen availability and carbon exchange processes in a high arctic wetland |
publisher |
Canadian Science Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1139/as-2022-0048 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2022-0048 https://cdnsciencepub.com/doi/pdf/10.1139/as-2022-0048 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change |
genre_facet |
Arctic Arctic Climate change |
op_source |
Arctic Science ISSN 2368-7460 |
op_rights |
https://creativecommons.org/licenses/by/4.0/deed.en_GB |
op_doi |
https://doi.org/10.1139/as-2022-0048 |
container_title |
Arctic Science |
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1785551400132935680 |