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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Gregory B. Noe</dc:contributor>
  <dc:contributor>Cliff R. Hupp</dc:contributor>
  <dc:contributor>Ken W. Krauss</dc:contributor>
  <dc:contributor>Nancy B. Rybicki</dc:contributor>
  <dc:contributor>Edward R. Schenk</dc:contributor>
  <dc:creator>Jackie Batson</dc:creator>
  <dc:date>2015</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Understanding the controls on floodplain carbon (C) cycling is important for assessing greenhouse gas emissions and the potential for C sequestration in river-floodplain ecosystems. We hypothesized that greater hydrologic connectivity would increase C inputs to floodplains that would not only stimulate soil C gas emissions but also sequester more C in soils. In an urban Piedmont river (151&amp;thinsp;km&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;watershed) with a floodplain that is dry most of the year, we quantified soil CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;, CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;, and N&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O net emissions along gradients of floodplain hydrologic connectivity, identified controls on soil aerobic and anaerobic respiration, and developed a floodplain soil C budget. Sites were chosen along a longitudinal river gradient and across lateral floodplain geomorphic units (levee, backswamp, and toe slope). CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emissions decreased downstream in backswamps and toe slopes and were high on the levees. CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;and N&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O fluxes were near zero; however, CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;emissions were highest in the backswamp. Annual CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emissions correlated negatively with soil water-filled pore space and positively with variables related to drier, coarser soil. Conversely, annual CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emissions had the opposite pattern of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;. Spatial variation in aerobic and anaerobic respiration was thus controlled by oxygen availability but was not related to C inputs from sedimentation or vegetation. The annual mean soil CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emission rate was 1091&amp;thinsp;g&amp;thinsp;C&amp;thinsp;m&lt;/span&gt;&lt;sup&gt;&amp;minus;2&lt;/sup&gt;&lt;span&gt;&amp;thinsp;yr&lt;/span&gt;&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&lt;span&gt;, the net sedimentation rate was 111&amp;thinsp;g&amp;thinsp;C&amp;thinsp;m&lt;/span&gt;&lt;sup&gt;&amp;minus;2&lt;/sup&gt;&lt;span&gt;&amp;thinsp;yr&lt;/span&gt;&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&lt;span&gt;, and the vegetation production rate was 240&amp;thinsp;g&amp;thinsp;C&amp;thinsp;m&lt;/span&gt;&lt;sup&gt;&amp;minus;2&lt;/sup&gt;&lt;span&gt;&amp;thinsp;yr&lt;/span&gt;&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&lt;span&gt;, with a soil C balance (loss) of &amp;minus;338&amp;thinsp;g&amp;thinsp;C&amp;thinsp;m&lt;/span&gt;&lt;sup&gt;&amp;minus;2&lt;/sup&gt;&lt;span&gt;&amp;thinsp;yr&lt;/span&gt;&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&lt;span&gt;. This floodplain is losing C likely due to long-term drying from watershed urbanization.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1002/2014JG002817</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Wiley</dc:publisher>
  <dc:title>Soil greenhouse gas emissions and carbon budgeting in a short-hydroperiod floodplain wetland</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>