Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia
Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem-atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO2) and methane (CH4) budgets are highly uncertain. We measured CO2 and CH4 flux...
Published in: | Biogeosciences |
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Main Authors: | , , , , , , , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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COPERNICUS GESELLSCHAFT MBH
2022
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Subjects: | |
Online Access: | http://hdl.handle.net/10138/346711 |
id |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/346711 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
METHANE FLUXES CARBON-DIOXIDE FOREST SOILS EXCHANGE VEGETATION ECOSYSTEM BALANCE PERMAFROST LANDSCAPES EMISSIONS 4112 Forestry 1181 Ecology evolutionary biology |
spellingShingle |
METHANE FLUXES CARBON-DIOXIDE FOREST SOILS EXCHANGE VEGETATION ECOSYSTEM BALANCE PERMAFROST LANDSCAPES EMISSIONS 4112 Forestry 1181 Ecology evolutionary biology Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Rasanen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vaha, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
topic_facet |
METHANE FLUXES CARBON-DIOXIDE FOREST SOILS EXCHANGE VEGETATION ECOSYSTEM BALANCE PERMAFROST LANDSCAPES EMISSIONS 4112 Forestry 1181 Ecology evolutionary biology |
description |
Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem-atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO2) and methane (CH4) budgets are highly uncertain. We measured CO2 and CH4 fluxes, vegetation composition and leaf area index (LAI), thaw depth, and soil wetness in Tiksi (71 degrees N, 128 degrees E), a heterogeneous site located within the prostrate dwarf-shrub tundra zone in northeastern Siberia. Using the closed chamber method, we determined the net ecosystem exchange (NEE) of CO2, ecosystem respiration in the dark (ER), ecosystem gross photosynthesis (Pg), and CH4 flux during the growing season. We applied a previously developed high-spatial-resolution land cover map over an area of 35.8 km(2) for spatial extrapolation. Among the land cover types varying from barren to dwarf-shrub tundra and tundra wetlands, the NEE and Pg at the photosynthetically active photon flux density of 800 mu mol m(-2) h(-1) (NEE800 and Pg(800)) were greatest in the graminoid-dominated habitats, i.e., streamside meadow and fens, with NEE800 and Pg(800) of up to -21 (uptake) and 28 mmol M-2 h(-1), respectively. Vascular LAI was a robust predictor of both NEE800 and Pg(800) and, on a landscape scale, the fens were disproportionately important for the summertime CO2 sequestration. Dry tun- dra, including the dwarf-shrub and lichen tundra, had smaller CO2 exchange rates. The fens were the largest source of CH4, while the dry mineral soil tundra consumed atmospheric CH4, which on a landscape scale amounted to -9 % of the total CH(4 )balance during the growing season. The largest seasonal mean CH4 consumption rate of 0.02 mmol m(-2) h(-1) occurred in sand- and stone-covered barren areas. The high consumption rate agrees with the estimate based on the eddy covariance measurements at the same site. We acknowledge the uncertainty involved in spatial extrapolations due to a small number of replicates per land cover type. ... |
author2 |
Department of Forest Sciences Ecosystems and Environment Research Programme Helsinki Institute of Sustainability Science (HELSUS) Environmental Change Research Unit (ECRU) Tarmo Virtanen / Principal Investigator Terrestrial Interactions Research Group |
format |
Article in Journal/Newspaper |
author |
Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Rasanen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vaha, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas |
author_facet |
Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Rasanen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vaha, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas |
author_sort |
Juutinen, Sari |
title |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_short |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_full |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_fullStr |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_full_unstemmed |
Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia |
title_sort |
variation in co2 and ch4 fluxes among land cover types in heterogeneous arctic tundra in northeastern siberia |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2022 |
url |
http://hdl.handle.net/10138/346711 |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Tiksi |
geographic_facet |
Arctic Tiksi |
genre |
Arctic Arctic permafrost Tiksi Tundra Siberia |
genre_facet |
Arctic Arctic permafrost Tiksi Tundra Siberia |
op_relation |
10.5194/bg-19-3151-2022 This research has been supported by the Academy of Finland (grant nos. 269095, 285630, 291736, and 296888), the European Commission, Seventh Framework Programme (PAGE21 (grant no. 282700)), and the NordForsk (DEFROST Nordic Centre of Excellence grant). Juutinen , S , Aurela , M , Tuovinen , J-P , Ivakhov , V , Linkosalmi , M , Rasanen , A , Virtanen , T , Mikola , J , Nyman , J , Vaha , E , Loskutova , M , Makshtas , A & Laurila , T 2022 , ' Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia ' , Biogeosciences , vol. 19 , no. 13 , pp. 3151-3167 . https://doi.org/10.5194/bg-19-3151-2022 ORCID: /0000-0002-4336-2648/work/116873961 ORCID: /0000-0001-8660-2464/work/116874297 d140e516-fd91-4a3d-891b-ef271253bc0d http://hdl.handle.net/10138/346711 000820335200001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
13 |
container_start_page |
3151 |
op_container_end_page |
3167 |
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1787421557264482304 |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/346711 2024-01-07T09:40:45+01:00 Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia Juutinen, Sari Aurela, Mika Tuovinen, Juha-Pekka Ivakhov, Viktor Linkosalmi, Maiju Rasanen, Aleksi Virtanen, Tarmo Mikola, Juha Nyman, Johanna Vaha, Emmi Loskutova, Marina Makshtas, Alexander Laurila, Tuomas Department of Forest Sciences Ecosystems and Environment Research Programme Helsinki Institute of Sustainability Science (HELSUS) Environmental Change Research Unit (ECRU) Tarmo Virtanen / Principal Investigator Terrestrial Interactions Research Group 2022-08-05T06:48:02Z 17 application/pdf http://hdl.handle.net/10138/346711 eng eng COPERNICUS GESELLSCHAFT MBH 10.5194/bg-19-3151-2022 This research has been supported by the Academy of Finland (grant nos. 269095, 285630, 291736, and 296888), the European Commission, Seventh Framework Programme (PAGE21 (grant no. 282700)), and the NordForsk (DEFROST Nordic Centre of Excellence grant). Juutinen , S , Aurela , M , Tuovinen , J-P , Ivakhov , V , Linkosalmi , M , Rasanen , A , Virtanen , T , Mikola , J , Nyman , J , Vaha , E , Loskutova , M , Makshtas , A & Laurila , T 2022 , ' Variation in CO2 and CH4 fluxes among land cover types in heterogeneous Arctic tundra in northeastern Siberia ' , Biogeosciences , vol. 19 , no. 13 , pp. 3151-3167 . https://doi.org/10.5194/bg-19-3151-2022 ORCID: /0000-0002-4336-2648/work/116873961 ORCID: /0000-0001-8660-2464/work/116874297 d140e516-fd91-4a3d-891b-ef271253bc0d http://hdl.handle.net/10138/346711 000820335200001 cc_by openAccess info:eu-repo/semantics/openAccess METHANE FLUXES CARBON-DIOXIDE FOREST SOILS EXCHANGE VEGETATION ECOSYSTEM BALANCE PERMAFROST LANDSCAPES EMISSIONS 4112 Forestry 1181 Ecology evolutionary biology Article publishedVersion 2022 ftunivhelsihelda 2023-12-14T00:01:20Z Arctic tundra is facing unprecedented warming, resulting in shifts in the vegetation, thaw regimes, and potentially in the ecosystem-atmosphere exchange of carbon (C). However, the estimates of regional carbon dioxide (CO2) and methane (CH4) budgets are highly uncertain. We measured CO2 and CH4 fluxes, vegetation composition and leaf area index (LAI), thaw depth, and soil wetness in Tiksi (71 degrees N, 128 degrees E), a heterogeneous site located within the prostrate dwarf-shrub tundra zone in northeastern Siberia. Using the closed chamber method, we determined the net ecosystem exchange (NEE) of CO2, ecosystem respiration in the dark (ER), ecosystem gross photosynthesis (Pg), and CH4 flux during the growing season. We applied a previously developed high-spatial-resolution land cover map over an area of 35.8 km(2) for spatial extrapolation. Among the land cover types varying from barren to dwarf-shrub tundra and tundra wetlands, the NEE and Pg at the photosynthetically active photon flux density of 800 mu mol m(-2) h(-1) (NEE800 and Pg(800)) were greatest in the graminoid-dominated habitats, i.e., streamside meadow and fens, with NEE800 and Pg(800) of up to -21 (uptake) and 28 mmol M-2 h(-1), respectively. Vascular LAI was a robust predictor of both NEE800 and Pg(800) and, on a landscape scale, the fens were disproportionately important for the summertime CO2 sequestration. Dry tun- dra, including the dwarf-shrub and lichen tundra, had smaller CO2 exchange rates. The fens were the largest source of CH4, while the dry mineral soil tundra consumed atmospheric CH4, which on a landscape scale amounted to -9 % of the total CH(4 )balance during the growing season. The largest seasonal mean CH4 consumption rate of 0.02 mmol m(-2) h(-1) occurred in sand- and stone-covered barren areas. The high consumption rate agrees with the estimate based on the eddy covariance measurements at the same site. We acknowledge the uncertainty involved in spatial extrapolations due to a small number of replicates per land cover type. ... Article in Journal/Newspaper Arctic Arctic permafrost Tiksi Tundra Siberia HELDA – University of Helsinki Open Repository Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Biogeosciences 19 13 3151 3167 |