Carbon fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in wate.pdf

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Carbon fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in wate.pdf

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Carbon fluxes at northern fens and bogs have opposite responses to inter-annual fluctuations in wate

CO2 fluxes at northern fens and bogs have opposite responses to inter‐annual fluctuations in water table Benjamin N. Sulman,1 Ankur R. Desai,1 Nicanor Z. Saliendra,2 Peter M. Lafleur,3 Lawrence B. Flanagan,4 Oliver Sonnentag,5 D. Scott Mackay,6 Alan G. Barr,7 and Garth van der Kamp8 Received 20 May 2010; revised 8 July 2010; accepted 17 August 2010; published 1 October 2010. [1] This study compares eddy‐covariance measurements of carbon dioxide fluxes at six northern temperate and boreal peatland sites in Canada and the northern United States of America, representing both bogs and fens. The two peatland types had opposite responses of gross ecosystem photosynthes is (GEP) and ecosystem respiration (ER) to inter‐annual fluctuations in water table level. At fens, wetter conditions were correlated with lower GEP and ER, while at bogs wetter conditions were correlated with higher GEP and ER. We hypothesize that these contrasting responses are due to differences in the relative contributions of vascular plants and mosses. The coherence of our results between sites representing a range of average environmental conditions indicates ecosystem‐scale differences in resilience to hydrological changes that should be taken into account when considering the future of peatland ecosystem services such as carbon sequestration under changing environmental conditions.Citation: Sulman, B. N., A. R. Desai, N. Z. Saliendra, P. M. Lafleur, L. B. Flanagan, O. Sonnentag, D. S. Mackay, A. G. Barr, and G. van der Kamp (2010), CO2 fluxes at northern fens and bogs have opposite responses to inter‐annual fluctuations in water table, Geophys. Res. Lett., 37, L19702, doi:10.1029/ 2010GL044018. 1. Introduction [2] Northern peatlands are recognized as an important component of the terrestrial carbon cycle due to their large carbon stores [Gorham, 1991; Turunen et al., 2002]. Short‐ term changes in hydrology are expected to affect ecosystem respiration (ER) in peatlands by changing the proportion of