<?xml version='1.0' encoding='utf-8'?>
<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>S.P. Faulkner</dc:contributor>
  <dc:contributor>M.J. Baldwin</dc:contributor>
  <dc:creator>K. Yu</dc:creator>
  <dc:date>2008</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;This study was conducted at three locations in a bottomland hardwood forest with a distinct elevation and hydrological gradient: ridge (high, dry), transition, and swamp (low, wet). At each location, concentrations of soil greenhouse gases (N&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;O, CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;, and CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;), their fluxes to the atmosphere, and soil redox potential (Eh) were measured bimonthly, while the water table was monitored every day. Results show that soil Eh was significantly (&lt;/span&gt;&lt;i&gt;P&lt;/i&gt;&lt;span&gt;&amp;nbsp;&amp;lt; 0.001) correlated with water table: a negative correlation at the ridge and transition locations, but a positive correlation at the permanently flooded swamp location. Both soil gas profile analysis and surface gas flux measurements indicated that the ridge and transition locations could be a sink of atmospheric CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;, especially in warm seasons, but generally functioned as a minor source of CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;in cool seasons. The swamp location was a major source of CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;, and the emission rate was higher in the warm seasons (mean 28 and median 23 mg m&lt;/span&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt; h&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;) than in the cool seasons (both mean and median 13 mg m&lt;/span&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt; h&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;). Average CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emission rate was 251, 380 and 52 mg m&lt;/span&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt; h&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;for the ridge, transition and swamp location, respectively. At each location, higher CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;emission rates were also found in the warm seasons. The lowest CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;emission rate was found at the swamp location, where soil C content was the highest, due to less microbial biomass, less CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;production in such an anaerobic environment, and greater difficulty of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;diffusion to the atmosphere. Cumulative global warming potential emission from these three greenhouse gases was in an order of swamp &amp;gt; transition &amp;gt; ridge location. The ratio 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;&amp;nbsp;production in soil is a critical factor for evaluating the overall benefit of soil C sequestration, which can be greatly offset by CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;production and emission.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1111/j.1365-2486.2008.01545.x</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Wiley</dc:publisher>
  <dc:title>Effect of hydrological conditions on nitrous oxide, methane, and carbon dioxide dynamics in a bottomland hardwood forest and its implication for soil carbon sequestration</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>