Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons
The patterned microtopography of subarctic mires generates a variety of environmental conditions, and carbon dioxide (CO 2 ) and methane (CH 4 ) dynamics vary spatially among different plant community types (PCTs). We studied the CO 2 and CH 4 exchange between a subarctic fen and the atmosphere at K...
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Copernicus Publications
2021
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ftdoajarticles:oai:doaj.org/article:8e903e24f5be4ded9f3d0fb03434a083 2023-05-15T16:57:44+02:00 Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons L. Heiskanen J.-P. Tuovinen A. Räsänen T. Virtanen S. Juutinen A. Lohila T. Penttilä M. Linkosalmi J. Mikola T. Laurila M. Aurela 2021-02-01T00:00:00Z https://doi.org/10.5194/bg-18-873-2021 https://doaj.org/article/8e903e24f5be4ded9f3d0fb03434a083 EN eng Copernicus Publications https://bg.copernicus.org/articles/18/873/2021/bg-18-873-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-873-2021 1726-4170 1726-4189 https://doaj.org/article/8e903e24f5be4ded9f3d0fb03434a083 Biogeosciences, Vol 18, Pp 873-896 (2021) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/bg-18-873-2021 2022-12-31T06:13:48Z The patterned microtopography of subarctic mires generates a variety of environmental conditions, and carbon dioxide (CO 2 ) and methane (CH 4 ) dynamics vary spatially among different plant community types (PCTs). We studied the CO 2 and CH 4 exchange between a subarctic fen and the atmosphere at Kaamanen in northern Finland based on flux chamber and eddy covariance measurements in 2017–2018. We observed strong spatial variation in carbon dynamics between the four main PCTs studied, which were largely controlled by water table level and differences in vegetation composition. The ecosystem respiration (ER) and gross primary productivity (GPP) increased gradually from the wettest PCT to the drier ones, and both ER and GPP were larger for all PCTs during the warmer and drier growing season 2018. We estimated that in 2017 the growing season CO 2 balances of the PCTs ranged from − 20 g C m −2 ( Trichophorum tussock PCT) to 64 g C m −2 (string margin PCT), while in 2018 all PCTs were small CO 2 sources (10–22 g C m −2 ). We observed small growing season CH 4 emissions ( < 1 g C m −2 ) from the driest PCT, while the other three PCTs had significantly larger emissions (mean 7.9, range 5.6–10.1 g C m −2 ) during the two growing seasons. Compared to the annual CO 2 balance ( − 8.5 ± 4.0 g C m −2 ) of the fen in 2017, in 2018 the annual balance ( − 5.6 ± 3.7 g C m −2 ) was affected by an earlier onset of photosynthesis in spring, which increased the CO 2 sink, and a drought event during summer, which decreased the sink. The CH 4 emissions were also affected by the drought. The annual CH 4 balance of the fen was 7.3 ± 0.2 g C m −2 in 2017 and 6.2 ± 0.1 g C m −2 in 2018. Thus, the carbon balance of the fen was close to zero in both years. The PCTs that were adapted to drier conditions provided ecosystem-level resilience to carbon loss due to water level drawdown. Article in Journal/Newspaper Kaamanen Northern Finland Subarctic Directory of Open Access Journals: DOAJ Articles Kaamanen ENVELOPE(27.000,27.000,69.050,69.050) Biogeosciences 18 3 873 896 |
institution |
Open Polar |
collection |
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 L. Heiskanen J.-P. Tuovinen A. Räsänen T. Virtanen S. Juutinen A. Lohila T. Penttilä M. Linkosalmi J. Mikola T. Laurila M. Aurela Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The patterned microtopography of subarctic mires generates a variety of environmental conditions, and carbon dioxide (CO 2 ) and methane (CH 4 ) dynamics vary spatially among different plant community types (PCTs). We studied the CO 2 and CH 4 exchange between a subarctic fen and the atmosphere at Kaamanen in northern Finland based on flux chamber and eddy covariance measurements in 2017–2018. We observed strong spatial variation in carbon dynamics between the four main PCTs studied, which were largely controlled by water table level and differences in vegetation composition. The ecosystem respiration (ER) and gross primary productivity (GPP) increased gradually from the wettest PCT to the drier ones, and both ER and GPP were larger for all PCTs during the warmer and drier growing season 2018. We estimated that in 2017 the growing season CO 2 balances of the PCTs ranged from − 20 g C m −2 ( Trichophorum tussock PCT) to 64 g C m −2 (string margin PCT), while in 2018 all PCTs were small CO 2 sources (10–22 g C m −2 ). We observed small growing season CH 4 emissions ( < 1 g C m −2 ) from the driest PCT, while the other three PCTs had significantly larger emissions (mean 7.9, range 5.6–10.1 g C m −2 ) during the two growing seasons. Compared to the annual CO 2 balance ( − 8.5 ± 4.0 g C m −2 ) of the fen in 2017, in 2018 the annual balance ( − 5.6 ± 3.7 g C m −2 ) was affected by an earlier onset of photosynthesis in spring, which increased the CO 2 sink, and a drought event during summer, which decreased the sink. The CH 4 emissions were also affected by the drought. The annual CH 4 balance of the fen was 7.3 ± 0.2 g C m −2 in 2017 and 6.2 ± 0.1 g C m −2 in 2018. Thus, the carbon balance of the fen was close to zero in both years. The PCTs that were adapted to drier conditions provided ecosystem-level resilience to carbon loss due to water level drawdown. |
format |
Article in Journal/Newspaper |
author |
L. Heiskanen J.-P. Tuovinen A. Räsänen T. Virtanen S. Juutinen A. Lohila T. Penttilä M. Linkosalmi J. Mikola T. Laurila M. Aurela |
author_facet |
L. Heiskanen J.-P. Tuovinen A. Räsänen T. Virtanen S. Juutinen A. Lohila T. Penttilä M. Linkosalmi J. Mikola T. Laurila M. Aurela |
author_sort |
L. Heiskanen |
title |
Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
title_short |
Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
title_full |
Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
title_fullStr |
Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
title_full_unstemmed |
Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
title_sort |
carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-873-2021 https://doaj.org/article/8e903e24f5be4ded9f3d0fb03434a083 |
long_lat |
ENVELOPE(27.000,27.000,69.050,69.050) |
geographic |
Kaamanen |
geographic_facet |
Kaamanen |
genre |
Kaamanen Northern Finland Subarctic |
genre_facet |
Kaamanen Northern Finland Subarctic |
op_source |
Biogeosciences, Vol 18, Pp 873-896 (2021) |
op_relation |
https://bg.copernicus.org/articles/18/873/2021/bg-18-873-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-873-2021 1726-4170 1726-4189 https://doaj.org/article/8e903e24f5be4ded9f3d0fb03434a083 |
op_doi |
https://doi.org/10.5194/bg-18-873-2021 |
container_title |
Biogeosciences |
container_volume |
18 |
container_issue |
3 |
container_start_page |
873 |
op_container_end_page |
896 |
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1766049347739320320 |