Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength
This paper evaluates the relative contribution of light and temperature on net ecosystem CO 2 uptake during the 2006 growing season in a polygonal tundra ecosystem in the Lena River Delta in Northern Siberia (72°22´ N, 126°30´ E). The occurrence and frequency of warm periods may be an important dete...
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Online Access: | https://doi.org/10.5194/bg-10-1337-2013 https://doaj.org/article/828867d7431246dc9d2bba2aa4db44dc |
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ftdoajarticles:oai:doaj.org/article:828867d7431246dc9d2bba2aa4db44dc 2023-05-15T15:03:35+02:00 Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength B. R. K. Runkle T. Sachs C. Wille E.-M. Pfeiffer L. Kutzbach 2013-03-01T00:00:00Z https://doi.org/10.5194/bg-10-1337-2013 https://doaj.org/article/828867d7431246dc9d2bba2aa4db44dc EN eng Copernicus Publications http://www.biogeosciences.net/10/1337/2013/bg-10-1337-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-1337-2013 1726-4170 1726-4189 https://doaj.org/article/828867d7431246dc9d2bba2aa4db44dc Biogeosciences, Vol 10, Iss 3, Pp 1337-1349 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-1337-2013 2022-12-30T21:26:54Z This paper evaluates the relative contribution of light and temperature on net ecosystem CO 2 uptake during the 2006 growing season in a polygonal tundra ecosystem in the Lena River Delta in Northern Siberia (72°22´ N, 126°30´ E). The occurrence and frequency of warm periods may be an important determinant of the magnitude of the ecosystem's carbon sink function, as they drive temperature-induced changes in respiration. Hot spells during the early portion of the growing season, when the photosynthetic apparatus of vascular plants is not fully developed, are shown to be more influential in creating positive mid-day surface-to-atmosphere net ecosystem CO 2 exchange fluxes than those occurring later in the season. In this work we also develop and present a multi-step bulk flux partition model to better account for tundra plant physiology and the specific light conditions of the arctic region. These conditions preclude the successful use of traditional partition methods that derive a respiration–temperature relationship from all nighttime data or from other bulk approaches that are insensitive to temperature or light stress. Nighttime growing season measurements are rare during the arctic summer, however, so the new method allows for temporal variation in the parameters describing both ecosystem respiration and gross uptake by fitting both processes at the same time. Much of the apparent temperature sensitivity of respiration seen in the traditional partition method is revealed in the new method to reflect seasonal changes in basal respiration rates. Understanding and quantifying the flux partition is an essential precursor to describing links between assimilation and respiration at different timescales, as it allows a more confident evaluation of measured net exchange over a broader range of environmental conditions. The growing season CO 2 sink estimated by this study is similar to those reported previously for this site, and is substantial enough to withstand the long, low-level respiratory CO 2 release during ... Article in Journal/Newspaper Arctic lena river Tundra Siberia Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 10 3 1337 1349 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 B. R. K. Runkle T. Sachs C. Wille E.-M. Pfeiffer L. Kutzbach Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
This paper evaluates the relative contribution of light and temperature on net ecosystem CO 2 uptake during the 2006 growing season in a polygonal tundra ecosystem in the Lena River Delta in Northern Siberia (72°22´ N, 126°30´ E). The occurrence and frequency of warm periods may be an important determinant of the magnitude of the ecosystem's carbon sink function, as they drive temperature-induced changes in respiration. Hot spells during the early portion of the growing season, when the photosynthetic apparatus of vascular plants is not fully developed, are shown to be more influential in creating positive mid-day surface-to-atmosphere net ecosystem CO 2 exchange fluxes than those occurring later in the season. In this work we also develop and present a multi-step bulk flux partition model to better account for tundra plant physiology and the specific light conditions of the arctic region. These conditions preclude the successful use of traditional partition methods that derive a respiration–temperature relationship from all nighttime data or from other bulk approaches that are insensitive to temperature or light stress. Nighttime growing season measurements are rare during the arctic summer, however, so the new method allows for temporal variation in the parameters describing both ecosystem respiration and gross uptake by fitting both processes at the same time. Much of the apparent temperature sensitivity of respiration seen in the traditional partition method is revealed in the new method to reflect seasonal changes in basal respiration rates. Understanding and quantifying the flux partition is an essential precursor to describing links between assimilation and respiration at different timescales, as it allows a more confident evaluation of measured net exchange over a broader range of environmental conditions. The growing season CO 2 sink estimated by this study is similar to those reported previously for this site, and is substantial enough to withstand the long, low-level respiratory CO 2 release during ... |
format |
Article in Journal/Newspaper |
author |
B. R. K. Runkle T. Sachs C. Wille E.-M. Pfeiffer L. Kutzbach |
author_facet |
B. R. K. Runkle T. Sachs C. Wille E.-M. Pfeiffer L. Kutzbach |
author_sort |
B. R. K. Runkle |
title |
Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
title_short |
Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
title_full |
Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
title_fullStr |
Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
title_full_unstemmed |
Bulk partitioning the growing season net ecosystem exchange of CO 2 in Siberian tundra reveals the seasonality of its carbon sequestration strength |
title_sort |
bulk partitioning the growing season net ecosystem exchange of co 2 in siberian tundra reveals the seasonality of its carbon sequestration strength |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-1337-2013 https://doaj.org/article/828867d7431246dc9d2bba2aa4db44dc |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic lena river Tundra Siberia |
genre_facet |
Arctic lena river Tundra Siberia |
op_source |
Biogeosciences, Vol 10, Iss 3, Pp 1337-1349 (2013) |
op_relation |
http://www.biogeosciences.net/10/1337/2013/bg-10-1337-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-10-1337-2013 1726-4170 1726-4189 https://doaj.org/article/828867d7431246dc9d2bba2aa4db44dc |
op_doi |
https://doi.org/10.5194/bg-10-1337-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
3 |
container_start_page |
1337 |
op_container_end_page |
1349 |
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1766335439680045056 |