Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape?
In the Arctic tundra, snowmelt is followed by soil thaw allowing water and dissolved nutrients to move downslope. However, the fate of the released nitrogen (N) remains unclear, which includes the fraction of N that is lost to downslope transport or converted to N gasses. We have quantified the rele...
Published in: | Soil Biology and Biochemistry |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/normalizing-time-in-terms-of-space(61788210-92fc-48db-b58f-2f0ac34a7198).html https://doi.org/10.1016/j.soilbio.2022.108840 https://curis.ku.dk/ws/files/358630759/1_s2.0_S0038071722002978_main.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/61788210-92fc-48db-b58f-2f0ac34a7198 2024-06-09T07:42:23+00:00 Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? Rasmussen, Laura Helene Mortensen, Louise H. Ambus, Per Michelsen, Anders Elberling, Bo 2022 application/pdf https://curis.ku.dk/portal/da/publications/normalizing-time-in-terms-of-space(61788210-92fc-48db-b58f-2f0ac34a7198).html https://doi.org/10.1016/j.soilbio.2022.108840 https://curis.ku.dk/ws/files/358630759/1_s2.0_S0038071722002978_main.pdf eng eng info:eu-repo/semantics/openAccess Rasmussen , L H , Mortensen , L H , Ambus , P , Michelsen , A & Elberling , B 2022 , ' Normalizing time in terms of space : What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? ' , Soil Biology and Biochemistry , vol. 175 , 108840 . https://doi.org/10.1016/j.soilbio.2022.108840 Arctic tundra NO emission Nitrogen cycling Snowmelt Structural equation model Topography article 2022 ftcopenhagenunip https://doi.org/10.1016/j.soilbio.2022.108840 2024-05-16T11:29:26Z In the Arctic tundra, snowmelt is followed by soil thaw allowing water and dissolved nutrients to move downslope. However, the fate of the released nitrogen (N) remains unclear, which includes the fraction of N that is lost to downslope transport or converted to N gasses. We have quantified the release of NO 3 − into the soil solution and the loss of gaseous N upon thaw and up to a month after first thaw in an Arctic hillslope in W Greenland. We further investigated which factors of the slope ecosystem that influence the NO 3 − concentrations and N 2 O fluxes throughout two snowmelt and growing seasons using a Structural Equation Model (SEM) linking physical, biological and biogeochemical characteristics across the slope. Snowmelt controls growing season onset, but varies in the landscape. To account for this, we normalized the spatiotemporal variation in snowmelt and soil thaw by measuring NO 3 − release and N 2 O loss in a controlled laboratory thaw experiment with topsoil cores from along the slope. We furthermore normalized seasonal progression of ecosystem variables in space based on the first day of soil thaw in the field. We tested the variable Day After Soil Thaw (DAST) as the temporal driver in our SEM, and found that season progression is the most important factor to describe patterns in NO 3 − concentrations and N 2 O fluxes. We conclude that DAST is a useful tool for analysing seasonal patterns in a spatially heterogeneous snowmelt landscape and between different snowmelt years. When normalizing based on first day of soil thaw, we saw that the decreasing NO 3 − content over the season did not control the increasing N 2 O emissions. Rather, nitrification replaced denitrification as the main N 2 O -source during the growing season, where soil temperatures increased and soil moisture decreased. The gaseous N loss from the slope during the first month of thaw was minor and amounted to 1% of the annual N deposition. A NO 3 − pulse released into solution after 24 h of thaw, when meltwater moves along the ... Article in Journal/Newspaper Arctic Arctic Greenland Tundra University of Copenhagen: Research Arctic Greenland Soil Biology and Biochemistry 175 108840 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Arctic tundra NO emission Nitrogen cycling Snowmelt Structural equation model Topography |
spellingShingle |
Arctic tundra NO emission Nitrogen cycling Snowmelt Structural equation model Topography Rasmussen, Laura Helene Mortensen, Louise H. Ambus, Per Michelsen, Anders Elberling, Bo Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
topic_facet |
Arctic tundra NO emission Nitrogen cycling Snowmelt Structural equation model Topography |
description |
In the Arctic tundra, snowmelt is followed by soil thaw allowing water and dissolved nutrients to move downslope. However, the fate of the released nitrogen (N) remains unclear, which includes the fraction of N that is lost to downslope transport or converted to N gasses. We have quantified the release of NO 3 − into the soil solution and the loss of gaseous N upon thaw and up to a month after first thaw in an Arctic hillslope in W Greenland. We further investigated which factors of the slope ecosystem that influence the NO 3 − concentrations and N 2 O fluxes throughout two snowmelt and growing seasons using a Structural Equation Model (SEM) linking physical, biological and biogeochemical characteristics across the slope. Snowmelt controls growing season onset, but varies in the landscape. To account for this, we normalized the spatiotemporal variation in snowmelt and soil thaw by measuring NO 3 − release and N 2 O loss in a controlled laboratory thaw experiment with topsoil cores from along the slope. We furthermore normalized seasonal progression of ecosystem variables in space based on the first day of soil thaw in the field. We tested the variable Day After Soil Thaw (DAST) as the temporal driver in our SEM, and found that season progression is the most important factor to describe patterns in NO 3 − concentrations and N 2 O fluxes. We conclude that DAST is a useful tool for analysing seasonal patterns in a spatially heterogeneous snowmelt landscape and between different snowmelt years. When normalizing based on first day of soil thaw, we saw that the decreasing NO 3 − content over the season did not control the increasing N 2 O emissions. Rather, nitrification replaced denitrification as the main N 2 O -source during the growing season, where soil temperatures increased and soil moisture decreased. The gaseous N loss from the slope during the first month of thaw was minor and amounted to 1% of the annual N deposition. A NO 3 − pulse released into solution after 24 h of thaw, when meltwater moves along the ... |
format |
Article in Journal/Newspaper |
author |
Rasmussen, Laura Helene Mortensen, Louise H. Ambus, Per Michelsen, Anders Elberling, Bo |
author_facet |
Rasmussen, Laura Helene Mortensen, Louise H. Ambus, Per Michelsen, Anders Elberling, Bo |
author_sort |
Rasmussen, Laura Helene |
title |
Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
title_short |
Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
title_full |
Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
title_fullStr |
Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
title_full_unstemmed |
Normalizing time in terms of space:What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? |
title_sort |
normalizing time in terms of space:what drives the fate of spring thaw-released nitrogen in a sloping arctic landscape? |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/normalizing-time-in-terms-of-space(61788210-92fc-48db-b58f-2f0ac34a7198).html https://doi.org/10.1016/j.soilbio.2022.108840 https://curis.ku.dk/ws/files/358630759/1_s2.0_S0038071722002978_main.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland Tundra |
genre_facet |
Arctic Arctic Greenland Tundra |
op_source |
Rasmussen , L H , Mortensen , L H , Ambus , P , Michelsen , A & Elberling , B 2022 , ' Normalizing time in terms of space : What drives the fate of spring thaw-released nitrogen in a sloping Arctic landscape? ' , Soil Biology and Biochemistry , vol. 175 , 108840 . https://doi.org/10.1016/j.soilbio.2022.108840 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.soilbio.2022.108840 |
container_title |
Soil Biology and Biochemistry |
container_volume |
175 |
container_start_page |
108840 |
_version_ |
1801371282425511936 |