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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| Format: | Article |
| Language: | English |
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Canadian Science Publishing
2024-03-01
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| Series: | Arctic Science |
| Subjects: | |
| Online Access: | https://cdnsciencepub.com/doi/10.1139/as-2022-0048 |
| _version_ | 1827318969549193216 |
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| author | Jacqueline K.Y. Hung Neal A. Scott Paul M. Treitz |
| author_facet | Jacqueline K.Y. Hung Neal A. Scott Paul M. Treitz |
| author_sort | Jacqueline K.Y. Hung |
| collection | DOAJ |
| 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 (R2 = 0.753), while ecosystem respiration was influenced by nitrogen availability, soil temperature, active layer depth, and sampling year (R2 = 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. |
| first_indexed | 2024-03-11T15:37:42Z |
| format | Article |
| id | doaj.art-efe2c046c1b443f7b901913307d7d15d |
| institution | Directory Open Access Journal |
| issn | 2368-7460 |
| language | English |
| last_indexed | 2024-04-25T00:10:43Z |
| publishDate | 2024-03-01 |
| publisher | Canadian Science Publishing |
| record_format | Article |
| series | Arctic Science |
| spelling | doaj.art-efe2c046c1b443f7b901913307d7d15d2024-03-13T14:16:57ZengCanadian Science PublishingArctic Science2368-74602024-03-01101223310.1139/as-2022-0048Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetlandJacqueline K.Y. Hung0Neal A. Scott1Paul M. Treitz2Queen's University, Kingston, ON, K7L 3N6, CanadaQueen's University, Kingston, ON, K7L 3N6, CanadaQueen's University, Kingston, ON, K7L 3N6, CanadaIncreased 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 (R2 = 0.753), while ecosystem respiration was influenced by nitrogen availability, soil temperature, active layer depth, and sampling year (R2 = 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.https://cdnsciencepub.com/doi/10.1139/as-2022-0048nitrogen availabilitygross ecosystem productivityecosystem respirationnet ecosystem exchangeHigh Arctic wetlandclimate change |
| spellingShingle | Jacqueline K.Y. Hung Neal A. Scott Paul M. Treitz Drivers of soil nitrogen availability and carbon exchange processes in a High Arctic wetland Arctic Science nitrogen availability gross ecosystem productivity ecosystem respiration net ecosystem exchange High Arctic wetland climate change |
| title | 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_short | 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 |
| topic | nitrogen availability gross ecosystem productivity ecosystem respiration net ecosystem exchange High Arctic wetland climate change |
| url | https://cdnsciencepub.com/doi/10.1139/as-2022-0048 |
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