Carbon balance of a Finnish bog: temporal variability and limiting factors based on 6 years of eddy-covariance data
Pristine boreal mires are known as substantial sinks of carbon dioxide ( CO 2 ) and net emitters of methane ( CH 4 ). Bogs constitute a major fraction of pristine boreal mires. However, the bog CO 2 and CH 4 balances are poorly known, having been largely estimated based on discrete and short-term me...
| Published in: | Biogeosciences |
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| Main Authors: | , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Copernicus Publications
2021
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| Subjects: | |
| Online Access: | https://doi.org/10.5194/bg-18-4681-2021 https://doaj.org/article/8944175c8eed414ebb36961c3308bcfe |
| Summary: | Pristine boreal mires are known as substantial sinks of carbon dioxide ( CO 2 ) and net emitters of methane ( CH 4 ). Bogs constitute a major fraction of pristine boreal mires. However, the bog CO 2 and CH 4 balances are poorly known, having been largely estimated based on discrete and short-term measurements by manual chambers and seldom using the eddy-covariance (EC) technique. Eddy-covariance (EC) measurements of CO 2 and CH 4 exchange were conducted in the Siikaneva mire complex in southern Finland in 2011–2016. The site is a patterned bog having a moss–sedge–shrub vegetation typical of southern Eurasian taiga, with several ponds near the EC tower. The study presents a complete series of CO 2 and CH 4 EC flux ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi>F</mi><mrow class="chem"><msub><mi mathvariant="normal">CH</mi><mn mathvariant="normal">4</mn></msub></mrow></msub></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="23pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="ab687810aac214ba5f355fd0aa86f2fd"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-4681-2021-ie00001.svg" width="23pt" height="14pt" src="bg-18-4681-2021-ie00001.png"/></svg:svg> ) measurements and identifies the environmental factors controlling the ecosystem–atmosphere CO 2 and CH 4 exchange. A 6-year average growing season (May–September) cumulative CO 2 exchange of − 61 ± 24 g C m −2 was observed, which partitions into mean total respiration (Re) of 167 ± 33 (interannual range 146–197) g C m −2 and mean gross primary production (GPP) of 228 ± 46 (interannual range 193–257) g C m −2 , while the corresponding <math xmlns="http://www.w3.org/1998/Math/MathML" id="M20" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi>F</mi><mrow ... |
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