Reconstruction of local vegetation in AD 915 at an oligotrophic mire in northern Japan from pollen, present-day vegetation and tephra data

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  • Reconstruction of local vegetation in AD 915 at an oligotrophic mire in northern Japan from pollen present day vegetation and tephra data

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<jats:p>The use of data for present‐day vegetation, modern and pretephra pollen have, together, allowed reconstruction of the spatial pattern of the vegetation of an oligotrophic mire, Shimo‐kenashi Mire, in <jats:sc>AD</jats:sc> 915. The modern pollen data were compared with the surrounding vegetation, showing that pollen of Ericaceae, Rosaceae (excluding <jats:italic>Sanguisorba</jats:italic>), <jats:italic>Sphagnum</jats:italic> and Liliaceae, together with trees and shrubs, which form scrub or thicket, indicate the limits of the mires. Shimo‐kenashi Mire was narrower in <jats:sc>AD</jats:sc> 915 and had more islands and peninsulas of scrub. Subsequently, the mire margin has advanced and the scrub islands and peninsulas have disappeared at some sites. The fact that the mire is spreading implies that conditions are wetter since <jats:sc>AD</jats:sc> 915, caused by changes in local hydrology. This history of vegetation at the site will contribute to the conservation and management of the mire as trends in vegetational change provide the basic information for conservation strategy.</jats:p>

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