Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses
Future Arctic tundra primary productivity and vegetation community composition will partly be determined by nitrogen (N) availability in a warmer climate. N mineralization rates are predicted to increase in both winter and summer, but because N demand and –mobility varies across seasons, the fate of...
Published in: | Biogeochemistry |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/modelling-impacts-of-lateral-n-flows-and-seasonal-warming-on-an-arctic-footslope-ecosystem-n-budget-and-n2o-emissions-based-on-specieslevel-responses(f664bbd6-1e7b-4c02-9ec2-2590fa8881d3).html https://doi.org/10.1007/s10533-022-00894-z https://curis.ku.dk/ws/files/358500860/d1dbf018_6a19_4c65_aef9_91482371394e.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/f664bbd6-1e7b-4c02-9ec2-2590fa8881d3 2024-06-09T07:42:29+00:00 Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses Rasmussen, Laura H. Zhang, Wenxin Ambus, Per Jansson, Per Erik Kitzler, Barbara Elberling, Bo 2022 application/pdf https://curis.ku.dk/portal/da/publications/modelling-impacts-of-lateral-n-flows-and-seasonal-warming-on-an-arctic-footslope-ecosystem-n-budget-and-n2o-emissions-based-on-specieslevel-responses(f664bbd6-1e7b-4c02-9ec2-2590fa8881d3).html https://doi.org/10.1007/s10533-022-00894-z https://curis.ku.dk/ws/files/358500860/d1dbf018_6a19_4c65_aef9_91482371394e.pdf eng eng info:eu-repo/semantics/closedAccess Rasmussen , L H , Zhang , W , Ambus , P , Jansson , P E , Kitzler , B & Elberling , B 2022 , ' Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses ' , Biogeochemistry , vol. 158 , no. 2 , pp. 195–213 . https://doi.org/10.1007/s10533-022-00894-z Arctic tundra Climate change CoupModel Solute transport Winter N mineralization article 2022 ftcopenhagenunip https://doi.org/10.1007/s10533-022-00894-z 2024-05-16T11:29:22Z Future Arctic tundra primary productivity and vegetation community composition will partly be determined by nitrogen (N) availability in a warmer climate. N mineralization rates are predicted to increase in both winter and summer, but because N demand and –mobility varies across seasons, the fate of mineralized N remains uncertain. N mineralized in winter is released in a “pulse” upon snowmelt and soil thaw, with the potential for lateral redistribution in the landscape. In summer, the release is into an active rhizosphere with high local biological N demand. In this study, we investigated the ecosystem sensitivity to increased lateral N input and near-surface warming, respectively and in combination, with a numerical ecosystem model (CoupModel) parameterized to simulate ecosystem biogeochemistry for a tundra heath ecosystem in West Greenland. Both measurements and model results indicated that plants were poor utilizers of increased early-season lateral N input, indicating that higher winter N mineralization rates may have limited impact on plant growth and carbon (C) sequestration for a hillslope ecosystem. The model further suggested that, although deciduous shrubs were the plant type with overall most lateral N gain, evergreen shrubs appear to have a comparative advantage utilizing early-season N. In contrast, near-surface summer warming increased plant biomass and N uptake, moving N from soil to plant N pools, and offered an advantage to deciduous plants. Neither simulated high lateral N fluxes nor near-surface soil warming suggests that mesic tundra heaths will be important sources of N 2 O under warmer conditions. Our work highlights how winter and summer warming may play different roles in tundra ecosystem N and C budgets depending on plant community composition. Article in Journal/Newspaper Arctic Arctic Climate change Greenland Tundra University of Copenhagen: Research Arctic Greenland Biogeochemistry 158 2 195 213 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Arctic tundra Climate change CoupModel Solute transport Winter N mineralization |
spellingShingle |
Arctic tundra Climate change CoupModel Solute transport Winter N mineralization Rasmussen, Laura H. Zhang, Wenxin Ambus, Per Jansson, Per Erik Kitzler, Barbara Elberling, Bo Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
topic_facet |
Arctic tundra Climate change CoupModel Solute transport Winter N mineralization |
description |
Future Arctic tundra primary productivity and vegetation community composition will partly be determined by nitrogen (N) availability in a warmer climate. N mineralization rates are predicted to increase in both winter and summer, but because N demand and –mobility varies across seasons, the fate of mineralized N remains uncertain. N mineralized in winter is released in a “pulse” upon snowmelt and soil thaw, with the potential for lateral redistribution in the landscape. In summer, the release is into an active rhizosphere with high local biological N demand. In this study, we investigated the ecosystem sensitivity to increased lateral N input and near-surface warming, respectively and in combination, with a numerical ecosystem model (CoupModel) parameterized to simulate ecosystem biogeochemistry for a tundra heath ecosystem in West Greenland. Both measurements and model results indicated that plants were poor utilizers of increased early-season lateral N input, indicating that higher winter N mineralization rates may have limited impact on plant growth and carbon (C) sequestration for a hillslope ecosystem. The model further suggested that, although deciduous shrubs were the plant type with overall most lateral N gain, evergreen shrubs appear to have a comparative advantage utilizing early-season N. In contrast, near-surface summer warming increased plant biomass and N uptake, moving N from soil to plant N pools, and offered an advantage to deciduous plants. Neither simulated high lateral N fluxes nor near-surface soil warming suggests that mesic tundra heaths will be important sources of N 2 O under warmer conditions. Our work highlights how winter and summer warming may play different roles in tundra ecosystem N and C budgets depending on plant community composition. |
format |
Article in Journal/Newspaper |
author |
Rasmussen, Laura H. Zhang, Wenxin Ambus, Per Jansson, Per Erik Kitzler, Barbara Elberling, Bo |
author_facet |
Rasmussen, Laura H. Zhang, Wenxin Ambus, Per Jansson, Per Erik Kitzler, Barbara Elberling, Bo |
author_sort |
Rasmussen, Laura H. |
title |
Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
title_short |
Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
title_full |
Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
title_fullStr |
Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
title_full_unstemmed |
Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses |
title_sort |
modelling impacts of lateral n flows and seasonal warming on an arctic footslope ecosystem n budget and n 2 o emissions based on species-level responses |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/modelling-impacts-of-lateral-n-flows-and-seasonal-warming-on-an-arctic-footslope-ecosystem-n-budget-and-n2o-emissions-based-on-specieslevel-responses(f664bbd6-1e7b-4c02-9ec2-2590fa8881d3).html https://doi.org/10.1007/s10533-022-00894-z https://curis.ku.dk/ws/files/358500860/d1dbf018_6a19_4c65_aef9_91482371394e.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Climate change Greenland Tundra |
genre_facet |
Arctic Arctic Climate change Greenland Tundra |
op_source |
Rasmussen , L H , Zhang , W , Ambus , P , Jansson , P E , Kitzler , B & Elberling , B 2022 , ' Modelling impacts of lateral N flows and seasonal warming on an arctic footslope ecosystem N budget and N 2 O emissions based on species-level responses ' , Biogeochemistry , vol. 158 , no. 2 , pp. 195–213 . https://doi.org/10.1007/s10533-022-00894-z |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s10533-022-00894-z |
container_title |
Biogeochemistry |
container_volume |
158 |
container_issue |
2 |
container_start_page |
195 |
op_container_end_page |
213 |
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1801371328125599744 |