Low impact of dry conditions on the CO2 exchange of a Northern-Norwegian blanket bog

Northern peatlands hold large amounts of organic carbon (C) in their soils and are as such important in a climate change context. Blanket bogs, i.e. nutrient-poor peatlands restricted to maritime climates, may be extra vulnerable to global warming since they require a positive water balance to susta...

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Bibliographic Details
Published in:Environmental research letters 2015-02, Vol.10 (2), p.025004
Main Authors: Lund, Magnus, Bjerke, J W, Drake, B G, Engelsen, O, Hansen, G H, Parmentier, F J W, Powell, T L, Silvennoinen, H, Sottocornola, M, Tømmervik, H, Weldon, S, Rasse, D P
Format: Article
Language:English
Subjects:
blanket bog
Bogs
carbon
Carbon dioxide
Climate
Climate change
Climate effects
Earth and Related Environmental Sciences
Ecological monitoring
ecosystem exchange
eddy covariance
Exchanging
Geovetenskap och miljövetenskap
Global warming
Mosses
Natural Sciences
Naturgeografi
Naturvetenskap
net
net ecosystem exchange
Organic carbon
peatland
Peatlands
Physical Geography
Primary production
Vapor pressure
Water balance
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Summary:Northern peatlands hold large amounts of organic carbon (C) in their soils and are as such important in a climate change context. Blanket bogs, i.e. nutrient-poor peatlands restricted to maritime climates, may be extra vulnerable to global warming since they require a positive water balance to sustain their moss dominated vegetation and C sink functioning. This study presents a 4.5 year record of land-atmosphere carbon dioxide (CO2) exchange from the Andøya blanket bog in northern Norway. Compared with other peatlands, the Andøya peatland exhibited low flux rates, related to the low productivity of the dominating moss and lichen communities and the maritime settings that attenuated seasonal temperature variations. It was observed that under periods of high vapour pressure deficit, net ecosystem exchange was reduced, which was mainly caused by a decrease in gross primary production. However, no persistent effects of dry conditions on the CO2 exchange dynamics were observed, indicating that under present conditions and within the range of observed meteorological conditions the Andøya blanket bog retained its C uptake function. Continued monitoring of these ecosystem types is essential in order to detect possible effects of a changing climate.
ISSN:1748-9326
1748-9326
DOI:10.1088/1748-9326/10/2/025004