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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>Sasha C. Reed</dc:contributor>
  <dc:creator>Colin Tucker</dc:creator>
  <dc:date>2016</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Arid and semiarid ecosystems (drylands) may dominate the trajectory of biosphere-to-atmosphere carbon (C) exchange, and understanding dryland CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;efflux is important for C cycling at the global-scale. However, unknowns remain regarding how temperature and moisture interact to regulate dryland soil respiration (&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;), while ‘islands of fertility’ in drylands create spatially heterogeneous&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;. At a site in southeastern Utah, USA we added or removed litter (0–650&amp;nbsp;% of control) in plots associated with either shrubs or biological soil crust-dominated interspaces between vascular plants. We measured&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;, soil temperature (T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;), and water content (θ) repeatedly from October 2013 to November 2014.&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;was highest following rain in late summer at T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;&amp;nbsp;~30&amp;nbsp;°C, and lowest mid-summer at T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&amp;gt; 40&amp;nbsp;°C, resulting in apparent negative temperature sensitivity of&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;at high temperatures, and positive temperature sensitivity at low-moderate temperatures. We used Bayesian statistical methods to compare models capturing a range of hypothesized relationships between T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;, θ, and&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;. The best model indicates that apparent negative temperature sensitivity of&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;at high T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;&amp;nbsp;reflects the control of water content, not high temperatures. Modeled Q&lt;/span&gt;&lt;sub&gt;10&lt;/sub&gt;&lt;span&gt;&amp;nbsp;ranged from 2.7 to 1.4 between 5 and 45&amp;nbsp;°C. Litter addition had no effect on Q&lt;/span&gt;&lt;sub&gt;10&lt;/sub&gt;&lt;span&gt;&amp;nbsp;or reference respiration (&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;ref&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;=&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;at 20&amp;nbsp;°C and optimum θ) beneath shrubs, and little effect on&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;ref&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;in interspaces, yet&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;ref&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;was 1.5 times higher beneath shrubs than in interspaces. Altogether, these results suggest reduced&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;often observed at high T&lt;/span&gt;&lt;sub&gt;s&lt;/sub&gt;&lt;span&gt;&amp;nbsp;in drylands is dominated by the control of θ, and, on shorter-timescales, variable litter inputs exert minimal control over&amp;nbsp;&lt;/span&gt;&lt;i&gt;R&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;sub&gt;&lt;i&gt;s&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/sub&gt;&lt;span&gt;.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1007/s10533-016-0200-1</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Springer</dc:publisher>
  <dc:title>Low soil moisture during hot periods drives apparent negative temperature sensitivity of soil respiration in a dryland ecosystem: A multi-model comparison</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>