Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra
The climate sensitivity of carbon (C) cycling in Arctic terrestrial ecosystems is a major unknown in the Earth system. There is a lack of knowledge about the mechanisms that drive the interactions between photosynthesis, respiration, and changes in C stocks across full annual cycles in Arctic tundra...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2018
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Online Access: | https://pure.au.dk/portal/en/publications/4a739797-1752-4090-aaa2-64246b866dc0 https://doi.org/10.1029/2018JG004386 https://pure.au.dk/ws/files/135446434/L_pez_Blanco_et_al_2018_Journal_of_Geophysical_Research_3A_Biogeosciences.pdf http://www.scopus.com/inward/record.url?scp=85052945068&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/4a739797-1752-4090-aaa2-64246b866dc0 2024-04-28T08:04:36+00:00 Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra López-Blanco, Efrén Lund, Magnus Christensen, Torben R. Tamstorf, Mikkel P. Smallman, Thomas L. Slevin, Darren Westergaard-Nielsen, Andreas Hansen, Birger U. Abermann, Jakob Williams, Mathew 2018-09 application/pdf https://pure.au.dk/portal/en/publications/4a739797-1752-4090-aaa2-64246b866dc0 https://doi.org/10.1029/2018JG004386 https://pure.au.dk/ws/files/135446434/L_pez_Blanco_et_al_2018_Journal_of_Geophysical_Research_3A_Biogeosciences.pdf http://www.scopus.com/inward/record.url?scp=85052945068&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/4a739797-1752-4090-aaa2-64246b866dc0 info:eu-repo/semantics/openAccess López-Blanco , E , Lund , M , Christensen , T R , Tamstorf , M P , Smallman , T L , Slevin , D , Westergaard-Nielsen , A , Hansen , B U , Abermann , J & Williams , M 2018 , ' Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra ' , Journal of Geophysical Research: Biogeosciences , vol. 123 , no. 9 , pp. 2675-2694 . https://doi.org/10.1029/2018JG004386 Arctic tundra ecosystem exchange ecosystem respiration gross primary production plant traits process-based modeling article 2018 ftuniaarhuspubl https://doi.org/10.1029/2018JG004386 2024-04-17T23:42:41Z The climate sensitivity of carbon (C) cycling in Arctic terrestrial ecosystems is a major unknown in the Earth system. There is a lack of knowledge about the mechanisms that drive the interactions between photosynthesis, respiration, and changes in C stocks across full annual cycles in Arctic tundra. We use a calibrated and validated model (soil-plant-atmosphere; SPA) to estimate net ecosystem exchange (NEE), gross primary production (GPP), ecosystem respiration (R eco ), and internal C processing across eight full years. SPA's carbon flux estimates are validated with observational data obtained from the Greenland Ecosystem Monitoring program in West Greenland tundra. Overall, the model explained 73%, 73%, and 50% of the variance in NEE, GPP, and R eco , respectively, and 85% of the plant greenness variation. Flux data highlighted the insensitivity of growing season NEE to interannual meteorological variability, due to compensatory responses of photosynthesis and ecosystem respiration. In this modelling study, we show that this NEE buffering is the case also for full annual cycles. We show through a sensitivity analysis that plant traits related to nitrogen are likely key determinants in the compensatory response, through simulated links to photosynthesis and plant respiration. Interestingly, we found a similar temperature sensitivity of the trait-flux couplings for GPP and R eco , suggesting that plant traits drive the stabilization of NEE. Further, model analysis indicated that wintertime periods decreased the C sink by 60%, mostly driven by litter heterotrophic respiration. This result emphasizes the importance of wintertime periods and allows a more comprehensive understanding of full annual C dynamics. Article in Journal/Newspaper Arctic Arctic Greenland Tundra Aarhus University: Research Journal of Geophysical Research: Biogeosciences 123 9 2675 2694 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Arctic tundra ecosystem exchange ecosystem respiration gross primary production plant traits process-based modeling |
spellingShingle |
Arctic tundra ecosystem exchange ecosystem respiration gross primary production plant traits process-based modeling López-Blanco, Efrén Lund, Magnus Christensen, Torben R. Tamstorf, Mikkel P. Smallman, Thomas L. Slevin, Darren Westergaard-Nielsen, Andreas Hansen, Birger U. Abermann, Jakob Williams, Mathew Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
topic_facet |
Arctic tundra ecosystem exchange ecosystem respiration gross primary production plant traits process-based modeling |
description |
The climate sensitivity of carbon (C) cycling in Arctic terrestrial ecosystems is a major unknown in the Earth system. There is a lack of knowledge about the mechanisms that drive the interactions between photosynthesis, respiration, and changes in C stocks across full annual cycles in Arctic tundra. We use a calibrated and validated model (soil-plant-atmosphere; SPA) to estimate net ecosystem exchange (NEE), gross primary production (GPP), ecosystem respiration (R eco ), and internal C processing across eight full years. SPA's carbon flux estimates are validated with observational data obtained from the Greenland Ecosystem Monitoring program in West Greenland tundra. Overall, the model explained 73%, 73%, and 50% of the variance in NEE, GPP, and R eco , respectively, and 85% of the plant greenness variation. Flux data highlighted the insensitivity of growing season NEE to interannual meteorological variability, due to compensatory responses of photosynthesis and ecosystem respiration. In this modelling study, we show that this NEE buffering is the case also for full annual cycles. We show through a sensitivity analysis that plant traits related to nitrogen are likely key determinants in the compensatory response, through simulated links to photosynthesis and plant respiration. Interestingly, we found a similar temperature sensitivity of the trait-flux couplings for GPP and R eco , suggesting that plant traits drive the stabilization of NEE. Further, model analysis indicated that wintertime periods decreased the C sink by 60%, mostly driven by litter heterotrophic respiration. This result emphasizes the importance of wintertime periods and allows a more comprehensive understanding of full annual C dynamics. |
format |
Article in Journal/Newspaper |
author |
López-Blanco, Efrén Lund, Magnus Christensen, Torben R. Tamstorf, Mikkel P. Smallman, Thomas L. Slevin, Darren Westergaard-Nielsen, Andreas Hansen, Birger U. Abermann, Jakob Williams, Mathew |
author_facet |
López-Blanco, Efrén Lund, Magnus Christensen, Torben R. Tamstorf, Mikkel P. Smallman, Thomas L. Slevin, Darren Westergaard-Nielsen, Andreas Hansen, Birger U. Abermann, Jakob Williams, Mathew |
author_sort |
López-Blanco, Efrén |
title |
Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
title_short |
Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
title_full |
Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
title_fullStr |
Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
title_full_unstemmed |
Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra |
title_sort |
plant traits are key determinants in buffering the meteorological sensitivity of net carbon exchanges of arctic tundra |
publishDate |
2018 |
url |
https://pure.au.dk/portal/en/publications/4a739797-1752-4090-aaa2-64246b866dc0 https://doi.org/10.1029/2018JG004386 https://pure.au.dk/ws/files/135446434/L_pez_Blanco_et_al_2018_Journal_of_Geophysical_Research_3A_Biogeosciences.pdf http://www.scopus.com/inward/record.url?scp=85052945068&partnerID=8YFLogxK |
genre |
Arctic Arctic Greenland Tundra |
genre_facet |
Arctic Arctic Greenland Tundra |
op_source |
López-Blanco , E , Lund , M , Christensen , T R , Tamstorf , M P , Smallman , T L , Slevin , D , Westergaard-Nielsen , A , Hansen , B U , Abermann , J & Williams , M 2018 , ' Plant Traits are Key Determinants in Buffering the Meteorological Sensitivity of Net Carbon Exchanges of Arctic Tundra ' , Journal of Geophysical Research: Biogeosciences , vol. 123 , no. 9 , pp. 2675-2694 . https://doi.org/10.1029/2018JG004386 |
op_relation |
https://pure.au.dk/portal/en/publications/4a739797-1752-4090-aaa2-64246b866dc0 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2018JG004386 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
123 |
container_issue |
9 |
container_start_page |
2675 |
op_container_end_page |
2694 |
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1797575167479644160 |