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

• Published in: Environmental Research Letters
• Main Authors: Lund, Magnus, Bjerke, J. W., Drake, B. G., Engelsen, O., Hansen, G. H., Parmentier, Frans-Jan, Powell, T. L., Silvennoinen, H., Sottocornola, M., Tommervik, H., Weldon, S., Rasse, D. P.
• Format: Article in Journal/Newspaper
• Language: English
• Published: IOP Publishing 2015
• Subjects: Physical Geography; peatland; carbon; blanket bog; eddy covariance; climate change; net; ecosystem exchange; Norway; Northern Norway
• Online Access: https://lup.lub.lu.se/record/5297290; https://doi.org/10.1088/1748-9326/10/2/025004

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 Andoya blanket bog in northern Norway. Compared with other peatlands, the Andoya 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 Andoya 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.