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        <gco:CharacterString>Bulk sediment organic matter composition Dataset Description: &amp;lt;p&amp;gt;Bulk sediment organic matter composition of three high marsh ponds within PIE-LTER. Data were collected over 11 weeks in the summer and fall of 2014.&amp;lt;/p&amp;gt; Methods and Sampling: &amp;lt;p&amp;gt;The three ponds are located in the high marsh (1.43-1.46 m above North American Vertical Datum of 1988) of the Plum Island Ecosystems – Long Term Ecological Research (PIE-LTER) site. Surface sediments were collected weekly for TOC, TN, δ&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C, and δ&amp;lt;sup&amp;gt;15&amp;lt;/sup&amp;gt;N (June 25-August 13 and November 11-25, 2014). Cores (5 cm diameter x 2 cm deep) were collected from three 1 m&amp;lt;sup&amp;gt;2&amp;lt;/sup&amp;gt; quadrats placed at random locations along two crisscrossing transects in each pond. Sediments were combined in combusted glass vials to form composite samples and stored (-80 ℃) until analysis. sediment samples were prepared for elemental and isotopic analyses by drying to constant mass (60 °C), homogenizing with a Retsch Mixer Mill 200 (plants and sediments), and fuming with hydrochloric (HCl) acid to remove carbonates (Hedges and Stern 1984). Analyses were performed by the Stable Isotope Laboratory at the Marine Biological Laboratory (Woods Hole, MA). Isotopic data are reported in the conventional δ-notation in units of per mil (‰).&amp;lt;/p&amp;gt;</gco:CharacterString>
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