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...
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2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00061073 2023-05-15T14:49:20+02:00 High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs McCaully, Rachael E. Arendt, Carli A. Newman, Brent D. Salmon, Verity G. Heikoop, Jeffrey M. Wilson, Cathy J. Sevanto, Sanna Wales, Nathan A. Perkins, George B. Marina, Oana C. Wullschleger, Stan D. 2022-05 electronic https://doi.org/10.5194/tc-16-1889-2022 https://noa.gwlb.de/receive/cop_mods_00061073 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060583/tc-16-1889-2022.pdf https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-1889-2022 https://noa.gwlb.de/receive/cop_mods_00061073 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060583/tc-16-1889-2022.pdf https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/tc-16-1889-2022 2022-05-22T23:11:02Z 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 (NO 3-) 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 NO 3- 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 Niedersächsisches Online-Archiv NOA Arctic The Cryosphere 16 5 1889 1901 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung McCaully, Rachael E. Arendt, Carli A. Newman, Brent D. Salmon, Verity G. Heikoop, Jeffrey M. Wilson, Cathy J. Sevanto, Sanna Wales, Nathan A. Perkins, George B. Marina, Oana C. Wullschleger, Stan D. High nitrate variability on an Alaskan permafrost hillslope dominated by alder shrubs |
topic_facet |
article Verlagsveröffentlichung |
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 (NO 3-) 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 NO 3- 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 |
McCaully, Rachael E. Arendt, Carli A. Newman, Brent D. Salmon, Verity G. Heikoop, Jeffrey M. Wilson, Cathy J. Sevanto, Sanna Wales, Nathan A. Perkins, George B. Marina, Oana C. Wullschleger, Stan D. |
author_facet |
McCaully, Rachael E. Arendt, Carli A. Newman, Brent D. Salmon, Verity G. Heikoop, Jeffrey M. Wilson, Cathy J. Sevanto, Sanna Wales, Nathan A. Perkins, George B. Marina, Oana C. Wullschleger, Stan D. |
author_sort |
McCaully, Rachael E. |
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://noa.gwlb.de/receive/cop_mods_00061073 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060583/tc-16-1889-2022.pdf https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf |
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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-16-1889-2022 https://noa.gwlb.de/receive/cop_mods_00061073 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060583/tc-16-1889-2022.pdf https://tc.copernicus.org/articles/16/1889/2022/tc-16-1889-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
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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1766320398677311488 |