Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia
Arctic tundra ecosystems are currently facing amplified rates of climate warming. Since these ecosystems store significant amounts of soil organic carbon, which can be mineralized to carbon dioxide ( CO 2 ) and methane ( CH 4 ), rising temperatures may cause increasing greenhouse gas fluxes to the a...
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Online Access: | https://doi.org/10.5194/bg-16-1543-2019 https://doaj.org/article/f429a8b1cb2641d8a962df4fb2d5ffb7 |
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ftdoajarticles:oai:doaj.org/article:f429a8b1cb2641d8a962df4fb2d5ffb7 2023-05-15T15:03:40+02:00 Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia T. Eckhardt C. Knoblauch L. Kutzbach D. Holl G. Simpson E. Abakumov E.-M. Pfeiffer 2019-04-01T00:00:00Z https://doi.org/10.5194/bg-16-1543-2019 https://doaj.org/article/f429a8b1cb2641d8a962df4fb2d5ffb7 EN eng Copernicus Publications https://www.biogeosciences.net/16/1543/2019/bg-16-1543-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1543-2019 1726-4170 1726-4189 https://doaj.org/article/f429a8b1cb2641d8a962df4fb2d5ffb7 Biogeosciences, Vol 16, Pp 1543-1562 (2019) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/bg-16-1543-2019 2022-12-31T06:53:38Z Arctic tundra ecosystems are currently facing amplified rates of climate warming. Since these ecosystems store significant amounts of soil organic carbon, which can be mineralized to carbon dioxide ( CO 2 ) and methane ( CH 4 ), rising temperatures may cause increasing greenhouse gas fluxes to the atmosphere. To understand how net the ecosystem exchange (NEE) of CO 2 will respond to changing climatic and environmental conditions, it is necessary to understand the individual responses of the processes contributing to NEE. Therefore, this study aimed to partition NEE at the soil–plant–atmosphere interface in an arctic tundra ecosystem and to identify the main environmental drivers of these fluxes. NEE was partitioned into gross primary productivity (GPP) and ecosystem respiration ( R eco ) and further into autotrophic ( R A ) and heterotrophic respiration ( R H ). The study examined CO 2 flux data collected during the growing season in 2015 using closed-chamber measurements in a polygonal tundra landscape in the Lena River Delta, northeastern Siberia. To capture the influence of soil hydrology on CO 2 fluxes, measurements were conducted at a water-saturated polygon center and a well-drained polygon rim. These chamber-measured fluxes were used to model NEE, GPP, R eco , R H , R A , and net primary production (NPP) at the pedon scale (1–10 m) and to determine cumulative growing season fluxes. Here, the response of in situ measured R A and R H fluxes from permafrost-affected soils of the polygonal tundra to hydrological conditions have been examined. Although changes in the water table depth at the polygon center sites did not affect CO 2 fluxes from R H , rising water tables were linked to reduced CO 2 fluxes from R A . Furthermore, this work found the polygonal tundra in the Lena River Delta to be a net sink for atmospheric CO 2 during the growing season. The NEE at the wet, depressed polygon center was more than twice that at the drier polygon rim. These differences between the two sites were caused by higher GPP ... Article in Journal/Newspaper Arctic lena river permafrost Tundra Siberia Directory of Open Access Journals: DOAJ Articles Arctic Biogeosciences 16 7 1543 1562 |
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ftdoajarticles |
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English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 T. Eckhardt C. Knoblauch L. Kutzbach D. Holl G. Simpson E. Abakumov E.-M. Pfeiffer Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Arctic tundra ecosystems are currently facing amplified rates of climate warming. Since these ecosystems store significant amounts of soil organic carbon, which can be mineralized to carbon dioxide ( CO 2 ) and methane ( CH 4 ), rising temperatures may cause increasing greenhouse gas fluxes to the atmosphere. To understand how net the ecosystem exchange (NEE) of CO 2 will respond to changing climatic and environmental conditions, it is necessary to understand the individual responses of the processes contributing to NEE. Therefore, this study aimed to partition NEE at the soil–plant–atmosphere interface in an arctic tundra ecosystem and to identify the main environmental drivers of these fluxes. NEE was partitioned into gross primary productivity (GPP) and ecosystem respiration ( R eco ) and further into autotrophic ( R A ) and heterotrophic respiration ( R H ). The study examined CO 2 flux data collected during the growing season in 2015 using closed-chamber measurements in a polygonal tundra landscape in the Lena River Delta, northeastern Siberia. To capture the influence of soil hydrology on CO 2 fluxes, measurements were conducted at a water-saturated polygon center and a well-drained polygon rim. These chamber-measured fluxes were used to model NEE, GPP, R eco , R H , R A , and net primary production (NPP) at the pedon scale (1–10 m) and to determine cumulative growing season fluxes. Here, the response of in situ measured R A and R H fluxes from permafrost-affected soils of the polygonal tundra to hydrological conditions have been examined. Although changes in the water table depth at the polygon center sites did not affect CO 2 fluxes from R H , rising water tables were linked to reduced CO 2 fluxes from R A . Furthermore, this work found the polygonal tundra in the Lena River Delta to be a net sink for atmospheric CO 2 during the growing season. The NEE at the wet, depressed polygon center was more than twice that at the drier polygon rim. These differences between the two sites were caused by higher GPP ... |
format |
Article in Journal/Newspaper |
author |
T. Eckhardt C. Knoblauch L. Kutzbach D. Holl G. Simpson E. Abakumov E.-M. Pfeiffer |
author_facet |
T. Eckhardt C. Knoblauch L. Kutzbach D. Holl G. Simpson E. Abakumov E.-M. Pfeiffer |
author_sort |
T. Eckhardt |
title |
Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
title_short |
Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
title_full |
Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
title_fullStr |
Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
title_full_unstemmed |
Partitioning net ecosystem exchange of CO 2 on the pedon scale in the Lena River Delta, Siberia |
title_sort |
partitioning net ecosystem exchange of co 2 on the pedon scale in the lena river delta, siberia |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-1543-2019 https://doaj.org/article/f429a8b1cb2641d8a962df4fb2d5ffb7 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic lena river permafrost Tundra Siberia |
genre_facet |
Arctic lena river permafrost Tundra Siberia |
op_source |
Biogeosciences, Vol 16, Pp 1543-1562 (2019) |
op_relation |
https://www.biogeosciences.net/16/1543/2019/bg-16-1543-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1543-2019 1726-4170 1726-4189 https://doaj.org/article/f429a8b1cb2641d8a962df4fb2d5ffb7 |
op_doi |
https://doi.org/10.5194/bg-16-1543-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
7 |
container_start_page |
1543 |
op_container_end_page |
1562 |
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1766335525072928768 |