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Terminal Pleistocene through Holocene Evolution of Whiteoak Bottoms, a Southern Blue Ridge Mountains Peatland

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Abstract

Our primary objective was to develop an understanding of the geomorphic evolution of Whiteoak Bottoms (WOB), a peatland along the Nantahala River in the Southern Blue Ridge Mountains (SBRM) of western North Carolina. Radiocarbon dates directly above basal fluvial sediments returned ages of 14,000 to 15,000 cal yr BP. These ages indicate WOB is the oldest dated peatland in the SBRM and that such wetlands have persisted throughout the Holocene. Below the relatively flat surface of the wetland, paleochannels, similar to those of the modern channel, were found; suggesting a persistence of similar channel morphology since the terminal Pleistocene. The wetland’s stratigraphy reveals a consistent pattern with basal fluvial cobbles being overlain by sandy channel-fill grading up into peat. Two different distinct inorganic deposits separate the lower organic deposits from the sapric peat deposits at the surface. Interestingly, we estimate more than 56% of the organic matter preserved by the wetland accumulated during the first 6,000 years of development. Overall, WOB has accumulated approximately 424 Mg/ha of carbon during the past 15,000 years. Maintenance of this wetland initially depended on the Nantahala River; however, today it is ground water and beavers that allows for the persistence of this rare landscape.

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Acknowledgments

We thank all of the field and lab assistants that helped obtaining our data. Funding in support of this research came from the National Science Foundation (DEB-0823293) in support of the Coweeta LTER program. The U.S.D.A. Forest Service granted permission to conduct this research, for which we are grateful.

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  1. Department of Geography, University of Georgia, GG Building, 210 Field St., Room 204, Athens, GA, 30602, USA

    Jacob M. McDonald & David S. Leigh

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  1. Jacob M. McDonald
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  2. David S. Leigh
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Correspondence to Jacob M. McDonald.

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McDonald, J.M., Leigh, D.S. Terminal Pleistocene through Holocene Evolution of Whiteoak Bottoms, a Southern Blue Ridge Mountains Peatland. Wetlands 31, 783–797 (2011). https://doi.org/10.1007/s13157-011-0195-2

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