Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration

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http://hdl.handle.net/10138/208855

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Kuttim , M , Hofsommer , M L , Robroek , B J M , Signarbieux , C , Jassey , V E J , Laine , A M , Lamentowicz , M , Buttler , A , Ilomets , M & Mills , R T E 2017 , ' Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration ' , Boreal Environment Research , vol. 22 , pp. 267-276 .

Title: Freeze-thaw cycles simultaneously decrease peatland photosynthetic carbon uptake and ecosystem respiration
Author: Kuttim, Martin; Hofsommer, Maaike L.; Robroek, Bjorn J. M.; Signarbieux, Constant; Jassey, Vincent E. J.; Laine, Anna M.; Lamentowicz, Mariusz; Buttler, Alexandre; Ilomets, Mati; Mills, Robert T. E.
Contributor: University of Helsinki, Department of Forest Sciences
Date: 2017
Language: eng
Number of pages: 10
Belongs to series: Boreal Environment Research
ISSN: 1239-6095
URI: http://hdl.handle.net/10138/208855
Abstract: Decreasing snow cover in winter resulting from climate warming increases the incidence of freeze-thaw cycles (FTCs) in many ecosystems, including peatlands. As peatland ecosystems form a globally significant long-term carbon storage, understanding the effects of changing conditions in winter on carbon dynamics is essential. We studied how FTCs affect peatland carbon cycling by conducting mesocosm experiments with Sphagnum. Our results indicate an overall impeding effect of FTCs on Sphagnum photosynthesis, chlorophyll content, ecosystem respiration and enzymatic processes. A threefold reduction in photosynthesis in the FTC treatment was related to a decrease in chlorophyll content, showing that Sphagnum physiologically suffers from repeated FTCs. In the FTC treatment beta-glucosidase and phosphatase enzymatic activities decreased by 50% and 30%, respectively, whilst alanine remained unaffected, indicating that in peat soils short-term FTCs affect the carbon and phosphorus cycles, but not the nitrogen cycle. Long-term effects of FTCs deserve further studies.
Subject: 1172 Environmental sciences
4112 Forestry
MICROBIAL COMMUNITY STRUCTURE
ARCTIC TUNDRA SOILS
CLIMATE-CHANGE
CHLOROPHYLL FLUORESCENCE
SNOW COVER
CO2
TEMPERATURE
BOREAL
BOG
MANIPULATION
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