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Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons

التفاصيل البيبلوغرافية
العنوان: Carbon dioxide and methane exchange of a patterned subarctic fen during two contrasting growing seasons
المؤلفون: L. Heiskanen, J.-P. Tuovinen, A. Räsänen, T. Virtanen, S. Juutinen, A. Lohila, T. Penttilä, M. Linkosalmi, J. Mikola, T. Laurila, M. Aurela
المصدر: Biogeosciences, Vol 18, Pp 873-896 (2021)
بيانات النشر: Copernicus Publications, 2021.
سنة النشر: 2021
المجموعة: LCC:Ecology
LCC:Life
LCC:Geology
مصطلحات موضوعية: Ecology, QH540-549.5, Life, QH501-531, Geology, QE1-996.5
الوصف: The patterned microtopography of subarctic mires generates a variety of environmental conditions, and carbon dioxide (CO2) and methane (CH4) dynamics vary spatially among different plant community types (PCTs). We studied the CO2 and CH4 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 CO2 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 CO2 sources (10–22 g C m−2). We observed small growing season CH4 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 CO2 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 CO2 sink, and a drought event during summer, which decreased the sink. The CH4 emissions were also affected by the drought. The annual CH4 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.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1726-4170
1726-4189
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
URL الوصول: https://doaj.org/article/8e903e24f5be4ded9f3d0fb03434a083
رقم الأكسشن: edsdoj.8e903e24f5be4ded9f3d0fb03434a083
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:17264170
17264189
DOI:10.5194/bg-18-873-2021