Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra
AbstractPredictions of the response of ecosystem respiration to warming in the Arctic are not well constrained, partly due to the considerable spatial heterogeneity of these permafrost‐dominated areas. Accurate calculations of in situ temperature sensitivities of respiration (Q10) are vital for the...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | https://www.openaccessrepository.it/record/91925 https://doi.org/10.1029/2017jg004227 |
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ftopenaccessrep:oai:zenodo.org:91925 2023-10-25T01:35:07+02:00 Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra David A. Lipson Eric Wilkman Beniamino Gioli Walter C. Oechel Yanfei Tang Donatella Zona 2018-07-01 https://www.openaccessrepository.it/record/91925 https://doi.org/10.1029/2017jg004227 eng eng info:eu-repo/grantAgreement/EC/H2020/727890/ url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/91925 doi:10.1029/2017jg004227 info:eu-repo/semantics/openAccess Division of Polar Programs H2020 Directorate for Geosciences National Science Foundation UK Research and Innovation NSF NERC EC Research and Innovation action Rural Digital Europe European Commission UKRI Paleontology Atmospheric Science Soil Science Water Science and Technology Ecology Aquatic Science Forestry info:eu-repo/semantics/article publication-article 2018 ftopenaccessrep https://doi.org/10.1029/2017jg004227 2023-09-26T22:20:24Z AbstractPredictions of the response of ecosystem respiration to warming in the Arctic are not well constrained, partly due to the considerable spatial heterogeneity of these permafrost‐dominated areas. Accurate calculations of in situ temperature sensitivities of respiration (Q10) are vital for the prediction of future Arctic emissions. To understand the impact of spatial heterogeneity on respiration rates and Q10, we compared respiration measured from automated chambers across the main local polygonized landscape forms (high and low centers, polygon rims, polygon troughs) to estimates from the flux‐partitioned net ecosystem exchange collected in an adjacent eddy covariance tower. Microtopographic type appears to be the most important variable explaining the variability in respiration rates, and low‐center polygons and polygon troughs show the greatest cumulative respiration rates, possibly linked to their deeper thaw depth and higher plant biomass. Regardless of the differences in absolute respiration rates, Q10 is surprisingly similar across all microtopographic features, possibly indicating a similar temperature limitation to decomposition across the landscape. Q10 was higher during the colder early summer and lower during the warmer peak growing season, consistent with an elevated temperature sensitivity under colder conditions. The respiration measured by the chambers and the estimates from the daytime flux‐partitioned eddy covariance data were within uncertainties during early and peak seasons but overestimated respiration later in the growing season. Overall, this study suggests that it is possible to simplify estimates of the temperature sensitivity of respiration across heterogeneous landscapes but that seasonal changes in Q10 should be incorporated into model simulations. Article in Journal/Newspaper Arctic permafrost Tundra Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Arctic Journal of Geophysical Research: Biogeosciences 123 7 2287 2302 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
topic |
Division of Polar Programs H2020 Directorate for Geosciences National Science Foundation UK Research and Innovation NSF NERC EC Research and Innovation action Rural Digital Europe European Commission UKRI Paleontology Atmospheric Science Soil Science Water Science and Technology Ecology Aquatic Science Forestry |
spellingShingle |
Division of Polar Programs H2020 Directorate for Geosciences National Science Foundation UK Research and Innovation NSF NERC EC Research and Innovation action Rural Digital Europe European Commission UKRI Paleontology Atmospheric Science Soil Science Water Science and Technology Ecology Aquatic Science Forestry David A. Lipson Eric Wilkman Beniamino Gioli Walter C. Oechel Yanfei Tang Donatella Zona Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
topic_facet |
Division of Polar Programs H2020 Directorate for Geosciences National Science Foundation UK Research and Innovation NSF NERC EC Research and Innovation action Rural Digital Europe European Commission UKRI Paleontology Atmospheric Science Soil Science Water Science and Technology Ecology Aquatic Science Forestry |
description |
AbstractPredictions of the response of ecosystem respiration to warming in the Arctic are not well constrained, partly due to the considerable spatial heterogeneity of these permafrost‐dominated areas. Accurate calculations of in situ temperature sensitivities of respiration (Q10) are vital for the prediction of future Arctic emissions. To understand the impact of spatial heterogeneity on respiration rates and Q10, we compared respiration measured from automated chambers across the main local polygonized landscape forms (high and low centers, polygon rims, polygon troughs) to estimates from the flux‐partitioned net ecosystem exchange collected in an adjacent eddy covariance tower. Microtopographic type appears to be the most important variable explaining the variability in respiration rates, and low‐center polygons and polygon troughs show the greatest cumulative respiration rates, possibly linked to their deeper thaw depth and higher plant biomass. Regardless of the differences in absolute respiration rates, Q10 is surprisingly similar across all microtopographic features, possibly indicating a similar temperature limitation to decomposition across the landscape. Q10 was higher during the colder early summer and lower during the warmer peak growing season, consistent with an elevated temperature sensitivity under colder conditions. The respiration measured by the chambers and the estimates from the daytime flux‐partitioned eddy covariance data were within uncertainties during early and peak seasons but overestimated respiration later in the growing season. Overall, this study suggests that it is possible to simplify estimates of the temperature sensitivity of respiration across heterogeneous landscapes but that seasonal changes in Q10 should be incorporated into model simulations. |
format |
Article in Journal/Newspaper |
author |
David A. Lipson Eric Wilkman Beniamino Gioli Walter C. Oechel Yanfei Tang Donatella Zona |
author_facet |
David A. Lipson Eric Wilkman Beniamino Gioli Walter C. Oechel Yanfei Tang Donatella Zona |
author_sort |
David A. Lipson |
title |
Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
title_short |
Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
title_full |
Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
title_fullStr |
Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
title_full_unstemmed |
Temperature Response of Respiration Across the Heterogeneous Landscape of the Alaskan Arctic Tundra |
title_sort |
temperature response of respiration across the heterogeneous landscape of the alaskan arctic tundra |
publishDate |
2018 |
url |
https://www.openaccessrepository.it/record/91925 https://doi.org/10.1029/2017jg004227 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/727890/ url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/91925 doi:10.1029/2017jg004227 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2017jg004227 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
123 |
container_issue |
7 |
container_start_page |
2287 |
op_container_end_page |
2302 |
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1780730283639701504 |