Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation

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Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation. / Haapala, Jaana K.; Morsky, Sami K.; Saarnio, Sanna; Rinnan, Riikka; Suokanerva, Hanne; Kyro, Esko; Latola, Kirsi; Martikanen, Pertti J.; Holopainen, Toini; Silvola, Jouko.

In: Global Change Biology, Vol. 15, No. 4, 2009, p. 943-954.

Research output: Contribution to journalArticle

Harvard

Haapala, JK, Morsky, SK, Saarnio, S, Rinnan, R, Suokanerva, H, Kyro, E, Latola, K, Martikanen, PJ, Holopainen, T & Silvola, J 2009, 'Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation', Global Change Biology, vol. 15, no. 4, pp. 943-954. https://doi.org/10.1111/j.1365-2486.2008.01785.x

APA

Haapala, J. K., Morsky, S. K., Saarnio, S., Rinnan, R., Suokanerva, H., Kyro, E., ... Silvola, J. (2009). Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation. Global Change Biology, 15(4), 943-954. https://doi.org/10.1111/j.1365-2486.2008.01785.x

CBE

Haapala JK, Morsky SK, Saarnio S, Rinnan R, Suokanerva H, Kyro E, Latola K, Martikanen PJ, Holopainen T, Silvola J. 2009. Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation. Global Change Biology. 15(4):943-954. https://doi.org/10.1111/j.1365-2486.2008.01785.x

MLA

Vancouver

Author

Haapala, Jaana K. ; Morsky, Sami K. ; Saarnio, Sanna ; Rinnan, Riikka ; Suokanerva, Hanne ; Kyro, Esko ; Latola, Kirsi ; Martikanen, Pertti J. ; Holopainen, Toini ; Silvola, Jouko. / Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation. In: Global Change Biology. 2009 ; Vol. 15, No. 4. pp. 943-954.

RIS

TY - JOUR

T1 - Carbon dioxide balance of a fen ecosystem in northern Finland under elevated UV-B radiation

AU - Haapala, Jaana K.

AU - Morsky, Sami K.

AU - Saarnio, Sanna

AU - Rinnan, Riikka

AU - Suokanerva, Hanne

AU - Kyro, Esko

AU - Latola, Kirsi

AU - Martikanen, Pertti J.

AU - Holopainen, Toini

AU - Silvola, Jouko

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Microbial Ecology (Closed 2011) (011008001)

PY - 2009

Y1 - 2009

N2 - The effect of elevated UV-B radiation on CO2 exchange of a natural flark fen was studied in open-field conditions during 2003-2005. The experimental site was located in SodankylA in northern Finland (67 degrees 22'N, 26 degrees 38'E, 179 m a.s.l.). Altogether 30 study plots, each 120 cm x 120 cm in size, were randomly distributed between three treatments (n=10): ambient control, UV-A control and UV-B treatment. The UV-B-treated plots were exposed to elevated UV-B radiation level for three growing seasons. The instantaneous net ecosystem CO2 exchange (NEE) and dark respiration (R-TOT) were measured during the growing season using a closed chamber method. The wintertime CO2 emissions were estimated using a gradient technique by analyzing the CO2 concentration in the snow pack. In addition to the instantaneous CO2 exchange, the seasonal CO2 balances during the growing seasons were modeled using environmental data measured at the site. In general, the instantaneous NEE at light saturation was slightly higher in the UV-B treatment compared with the ambient control, but the gross photosynthesis was unaffected by the exposure. The R-TOT was significantly lower under elevated UV-B in the third study year. The modeled seasonal (June-September) CO2 balance varied between the years depending on the ground water level and temperature conditions. During the driest year, the seasonal CO2 balance was negative (net release of CO2) in the ambient control and the UV-B treatment was CO2 neutral. During the third year, the seasonal CO2 uptake was 43 +/- 36 g CO2-C m(-2) in the ambient control and 79 +/- 45 g CO2-C m(-2) in the UV-B treatment. The results suggest that the long-term exposure to high UV-B radiation levels may slightly increase the CO2 accumulation to fens resulting from a decrease in microbial activity in peat. However, it is unlikely that the predicted development of the level of UV-B radiation would significantly affect the CO2 balance of fen ecosystems in future.

AB - The effect of elevated UV-B radiation on CO2 exchange of a natural flark fen was studied in open-field conditions during 2003-2005. The experimental site was located in SodankylA in northern Finland (67 degrees 22'N, 26 degrees 38'E, 179 m a.s.l.). Altogether 30 study plots, each 120 cm x 120 cm in size, were randomly distributed between three treatments (n=10): ambient control, UV-A control and UV-B treatment. The UV-B-treated plots were exposed to elevated UV-B radiation level for three growing seasons. The instantaneous net ecosystem CO2 exchange (NEE) and dark respiration (R-TOT) were measured during the growing season using a closed chamber method. The wintertime CO2 emissions were estimated using a gradient technique by analyzing the CO2 concentration in the snow pack. In addition to the instantaneous CO2 exchange, the seasonal CO2 balances during the growing seasons were modeled using environmental data measured at the site. In general, the instantaneous NEE at light saturation was slightly higher in the UV-B treatment compared with the ambient control, but the gross photosynthesis was unaffected by the exposure. The R-TOT was significantly lower under elevated UV-B in the third study year. The modeled seasonal (June-September) CO2 balance varied between the years depending on the ground water level and temperature conditions. During the driest year, the seasonal CO2 balance was negative (net release of CO2) in the ambient control and the UV-B treatment was CO2 neutral. During the third year, the seasonal CO2 uptake was 43 +/- 36 g CO2-C m(-2) in the ambient control and 79 +/- 45 g CO2-C m(-2) in the UV-B treatment. The results suggest that the long-term exposure to high UV-B radiation levels may slightly increase the CO2 accumulation to fens resulting from a decrease in microbial activity in peat. However, it is unlikely that the predicted development of the level of UV-B radiation would significantly affect the CO2 balance of fen ecosystems in future.

KW - stratospheric ozone depletion

KW - seasonal CO2 balance

KW - peatland ecosystem

KW - CO2 exchange

KW - flark fen

KW - ultraviolet-B

U2 - 10.1111/j.1365-2486.2008.01785.x

DO - 10.1111/j.1365-2486.2008.01785.x

M3 - Article

VL - 15

SP - 943

EP - 954

JO - Global Change Biology

T2 - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 4

ER -