High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs
In Arctic ecosystems, increasing temperatures are driving the expansion of nitrogen (N) fixing shrubs across tundra landscapes. The implications of this expansion to the biogeochemistry of Arctic ecosystems are of critical importance and more work is needed to better understand the form, availabilit...
Published in: | The Cryosphere |
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-1889-2022 https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://doaj.org/article/2d3d55796ce04f9a93855b6fd08410e4 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:2d3d55796ce04f9a93855b6fd08410e4 2023-05-15T14:49:19+02:00 High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs R. E. McCaully C. A. Arendt B. D. Newman V. G. Salmon J. M. Heikoop C. J. Wilson S. Sevanto N. A. Wales G. B. Perkins O. C. Marina S. D. Wullschleger 2022-05-01 https://doi.org/10.5194/tc-16-1889-2022 https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://doaj.org/article/2d3d55796ce04f9a93855b6fd08410e4 en eng Copernicus Publications doi:10.5194/tc-16-1889-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://doaj.org/article/2d3d55796ce04f9a93855b6fd08410e4 undefined The Cryosphere, Vol 16, Pp 1889-1901 (2022) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-1889-2022 2023-01-22T19:11:13Z In Arctic ecosystems, increasing temperatures are driving the expansion of nitrogen (N) fixing shrubs across tundra landscapes. The implications of this expansion to the biogeochemistry of Arctic ecosystems are of critical importance and more work is needed to better understand the form, availability, and transportation potential of N from these shrubs across a variety of Arctic landscapes. To gain insights into the processes controlling N within a permafrost hillslope system, the spatiotemporal variability of nitrate (NO3-) and its environmental controls were investigated at an alder (Alnus viridis spp. fruticosa) dominated permafrost tundra landscape in the Seward Peninsula, Alaska, USA. Soil pore water was collected from locations within alder shrubland growing along a well-drained hillslope and was compared to soil pore water collected from locations outside (upslope, downslope, and between) the alder shrubland. Soil pore water collected within alder shrubland had an average NO3-N (nitrogen from nitrate) concentration of 4.27±8.02 mg L−1 and differed significantly from locations outside alder shrubland (0.23±0.83 mg L−1; p<0.05). Temporal variation in NO3-N within and downslope of alder shrubland co-occurred with precipitation events where NO3- that accumulated in the soil was likely flushed downslope during rainfall. These findings have important implications for nutrient availability and mobility in N-limited permafrost systems that are experiencing shrub expansion in response to a warming Arctic. Article in Journal/Newspaper Arctic permafrost Seward Peninsula The Cryosphere Tundra Alaska Unknown Arctic The Cryosphere 16 5 1889 1901 |
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Open Polar |
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fttriple |
language |
English |
topic |
envir geo |
spellingShingle |
envir geo R. E. McCaully C. A. Arendt B. D. Newman V. G. Salmon J. M. Heikoop C. J. Wilson S. Sevanto N. A. Wales G. B. Perkins O. C. Marina S. D. Wullschleger High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
topic_facet |
envir geo |
description |
In Arctic ecosystems, increasing temperatures are driving the expansion of nitrogen (N) fixing shrubs across tundra landscapes. The implications of this expansion to the biogeochemistry of Arctic ecosystems are of critical importance and more work is needed to better understand the form, availability, and transportation potential of N from these shrubs across a variety of Arctic landscapes. To gain insights into the processes controlling N within a permafrost hillslope system, the spatiotemporal variability of nitrate (NO3-) and its environmental controls were investigated at an alder (Alnus viridis spp. fruticosa) dominated permafrost tundra landscape in the Seward Peninsula, Alaska, USA. Soil pore water was collected from locations within alder shrubland growing along a well-drained hillslope and was compared to soil pore water collected from locations outside (upslope, downslope, and between) the alder shrubland. Soil pore water collected within alder shrubland had an average NO3-N (nitrogen from nitrate) concentration of 4.27±8.02 mg L−1 and differed significantly from locations outside alder shrubland (0.23±0.83 mg L−1; p<0.05). Temporal variation in NO3-N within and downslope of alder shrubland co-occurred with precipitation events where NO3- that accumulated in the soil was likely flushed downslope during rainfall. These findings have important implications for nutrient availability and mobility in N-limited permafrost systems that are experiencing shrub expansion in response to a warming Arctic. |
format |
Article in Journal/Newspaper |
author |
R. E. McCaully C. A. Arendt B. D. Newman V. G. Salmon J. M. Heikoop C. J. Wilson S. Sevanto N. A. Wales G. B. Perkins O. C. Marina S. D. Wullschleger |
author_facet |
R. E. McCaully C. A. Arendt B. D. Newman V. G. Salmon J. M. Heikoop C. J. Wilson S. Sevanto N. A. Wales G. B. Perkins O. C. Marina S. D. Wullschleger |
author_sort |
R. E. McCaully |
title |
High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
title_short |
High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
title_full |
High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
title_fullStr |
High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
title_full_unstemmed |
High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
title_sort |
high nitrate variability on an alaskan permafrost hillslope dominated by alder shrubs |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-1889-2022 https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://doaj.org/article/2d3d55796ce04f9a93855b6fd08410e4 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Seward Peninsula The Cryosphere Tundra Alaska |
genre_facet |
Arctic permafrost Seward Peninsula The Cryosphere Tundra Alaska |
op_source |
The Cryosphere, Vol 16, Pp 1889-1901 (2022) |
op_relation |
doi:10.5194/tc-16-1889-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://doaj.org/article/2d3d55796ce04f9a93855b6fd08410e4 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-16-1889-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
5 |
container_start_page |
1889 |
op_container_end_page |
1901 |
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