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Decomposition and Organic Matter Quality in Continental Peatlands: The Ghost of Permafrost Past

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Abstract

Permafrost patterning in boreal peatlands contributes to landscape heterogeneity, as peat plateaus, palsas, and localized permafrost mounds are interspersed among unfrozen bogs and fens. The degradation of localized permafrost in peatlands alters local topography, hydrology, thermal regimes, and plant communities, and creates unique peatland features called “internal lawns.” I used laboratory incubations to quantify carbon dioxide (CO2) production in peat formed under different permafrost regimes (with permafrost, without permafrost, melted permafrost), and explored the relationships among proximate organic matter fractions, nutrient concentrations, and decomposition. Peat within each feature (internal lawn, bog, permafrost mound) is more chemically similar than peat collected within the same province (Alberta, Saskatchewan) or within depth intervals (surface, deep). Internal lawn peat produces more CO2 than the other peatland types. Across peatland features, acid-insoluble material (AIM) and AIM/nitrogen are significant predictors of decomposition. However, within each peatland feature, soluble proximate fractions are better predictors of CO2 production. Permafrost stability in peatlands influences plant and soil environments, which control litter inputs, organic matter quality, and decomposition rates. Spatial patterns of permafrost, as well as ecosystem processes within various permafrost features, should be considered when assessing the fate of soil carbon in northern ecosystems.

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Acknowledgements

My thanks to D. Beilman, I. Bauer, L. Halsey, D. Vitt, K. Wieder, C. Williams, and J. Yavitt for advice on this research and manuscript, and to J. Navaratnam, S. Manchur, K. Powell, and K. Scott for lab and/or field assistance. This research was supported by the National Science Foundation (BSR 97-27800 to R. K. Wieder and J. Yavitt), NSERC (to D. Vitt), the Society of Wetland Scientists (to M.R.T.), as well as the Killam Trust and the Circumpolar Institute at the University of Alberta.

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Correspondence to Merritt R. Turetsky.

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Turetsky, M.R. Decomposition and Organic Matter Quality in Continental Peatlands: The Ghost of Permafrost Past. Ecosystems 7, 740–750 (2004). https://doi.org/10.1007/s10021-004-0247-z

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