Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison
Ongoing climate warming will likely perturb vertical distributions of nitrogen availability in tundra soils through enhancing nitrogen mineralization and releasing previously inaccessible nitrogen from frozen permafrost soil. But, arctic tundra responses to such changes are uncertain, because of a l...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | http://www.osti.gov/servlets/purl/1362201 https://www.osti.gov/biblio/1362201 https://doi.org/10.1002/2016JG003554 |
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ftosti:oai:osti.gov:1362201 2023-07-30T04:01:33+02:00 Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison Zhu, Qing Iversen, Colleen M. Riley, William J. Slette, Ingrid J. Vander Stel, Holly M. 2021-10-25 application/pdf http://www.osti.gov/servlets/purl/1362201 https://www.osti.gov/biblio/1362201 https://doi.org/10.1002/2016JG003554 unknown http://www.osti.gov/servlets/purl/1362201 https://www.osti.gov/biblio/1362201 https://doi.org/10.1002/2016JG003554 doi:10.1002/2016JG003554 58 GEOSCIENCES 2021 ftosti https://doi.org/10.1002/2016JG003554 2023-07-11T09:19:08Z Ongoing climate warming will likely perturb vertical distributions of nitrogen availability in tundra soils through enhancing nitrogen mineralization and releasing previously inaccessible nitrogen from frozen permafrost soil. But, arctic tundra responses to such changes are uncertain, because of a lack of vertically explicit nitrogen tracer experiments and untested hypotheses of root nitrogen uptake under the stress of microbial competition implemented in land models. We conducted a vertically explicit 15N tracer experiment for three dominant tundra species to quantify plant N uptake profiles. Then we applied a nutrient competition model (N-COM), which is being integrated into the ACME Land Model, to explain the observations. Observations using an 15 N tracer showed that plant N uptake profiles were not consistently related to root biomass density profiles, which challenges the prevailing hypothesis that root density always exerts first-order control on N uptake. By considering essential root traits (e.g., biomass distribution and nutrient uptake kinetics) with an appropriate plant-microbe nutrient competition framework, our model reasonably reproduced the observed patterns of plant N uptake. Additionally, we show that previously applied nutrient competition hypotheses in Earth System Land Models fail to explain the diverse plant N uptake profiles we observed. These results cast doubt on current climate-scale model predictions of arctic plant responses to elevated nitrogen supply under a changing climate and highlight the importance of considering essential root traits in large-scale land models. Finally, we provided suggestions and a short synthesis of data availability for future trait-based land model development. Other/Unknown Material Arctic permafrost Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Journal of Geophysical Research: Biogeosciences 121 12 3101 3112 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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58 GEOSCIENCES Zhu, Qing Iversen, Colleen M. Riley, William J. Slette, Ingrid J. Vander Stel, Holly M. Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
topic_facet |
58 GEOSCIENCES |
description |
Ongoing climate warming will likely perturb vertical distributions of nitrogen availability in tundra soils through enhancing nitrogen mineralization and releasing previously inaccessible nitrogen from frozen permafrost soil. But, arctic tundra responses to such changes are uncertain, because of a lack of vertically explicit nitrogen tracer experiments and untested hypotheses of root nitrogen uptake under the stress of microbial competition implemented in land models. We conducted a vertically explicit 15N tracer experiment for three dominant tundra species to quantify plant N uptake profiles. Then we applied a nutrient competition model (N-COM), which is being integrated into the ACME Land Model, to explain the observations. Observations using an 15 N tracer showed that plant N uptake profiles were not consistently related to root biomass density profiles, which challenges the prevailing hypothesis that root density always exerts first-order control on N uptake. By considering essential root traits (e.g., biomass distribution and nutrient uptake kinetics) with an appropriate plant-microbe nutrient competition framework, our model reasonably reproduced the observed patterns of plant N uptake. Additionally, we show that previously applied nutrient competition hypotheses in Earth System Land Models fail to explain the diverse plant N uptake profiles we observed. These results cast doubt on current climate-scale model predictions of arctic plant responses to elevated nitrogen supply under a changing climate and highlight the importance of considering essential root traits in large-scale land models. Finally, we provided suggestions and a short synthesis of data availability for future trait-based land model development. |
author |
Zhu, Qing Iversen, Colleen M. Riley, William J. Slette, Ingrid J. Vander Stel, Holly M. |
author_facet |
Zhu, Qing Iversen, Colleen M. Riley, William J. Slette, Ingrid J. Vander Stel, Holly M. |
author_sort |
Zhu, Qing |
title |
Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
title_short |
Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
title_full |
Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
title_fullStr |
Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
title_full_unstemmed |
Root traits explain observed tundra vegetation nitrogen uptake patterns: Implications for trait-based land models: Tundra N Uptake Model-Data Comparison |
title_sort |
root traits explain observed tundra vegetation nitrogen uptake patterns: implications for trait-based land models: tundra n uptake model-data comparison |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1362201 https://www.osti.gov/biblio/1362201 https://doi.org/10.1002/2016JG003554 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_relation |
http://www.osti.gov/servlets/purl/1362201 https://www.osti.gov/biblio/1362201 https://doi.org/10.1002/2016JG003554 doi:10.1002/2016JG003554 |
op_doi |
https://doi.org/10.1002/2016JG003554 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
121 |
container_issue |
12 |
container_start_page |
3101 |
op_container_end_page |
3112 |
_version_ |
1772812333287997440 |