<?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>Donald Schoolmaster</dc:contributor>
  <dc:contributor>Ken Krauss</dc:contributor>
  <dc:contributor>Camille Stagg</dc:contributor>
  <dc:contributor>Nicole Cormier</dc:contributor>
  <dc:contributor>Rebecca Moss</dc:contributor>
  <dc:contributor>Yiyi Xiong</dc:contributor>
  <dc:contributor>Nathaniel B. Weston</dc:contributor>
  <dc:creator>Luzhen Chen</dc:creator>
  <dc:date>2025</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Wetlands are significant carbon (C) sinks and are expected to promote greater C assimilation as atmospheric CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;concentrations rise. However, the fate of C with environmental change along fresh-to-oligohaline wetland transitions is not well understood. We established an&amp;nbsp;&lt;/span&gt;&lt;i&gt;ex-situ&lt;/i&gt;&lt;span&gt;&amp;nbsp;mesocosm experiment to mimic future elevated atmospheric CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;concentrations (&lt;/span&gt;&lt;i&gt;e&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;, 720&amp;nbsp;ppm) versus current (380&amp;nbsp;ppm), and we exposed four co-occurring coastal wetland communities that naturally transgress (i.e., freshwater forest, mixed forest and marsh, marsh, mudflat) to these concentrations for two years. Overall, wetland communities with marsh plants in monoculture and mixed culture maintained high ecosystem C uptake with&amp;nbsp;&lt;/span&gt;&lt;i&gt;e&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;versus freshwater forested wetlands or mudflats, likely from superior plant species photosynthetic adjustment versus leaf area increases.&amp;nbsp;&lt;/span&gt;&lt;i&gt;e&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;promoted greater CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;uptake by leaves in all communities except mudflats, while promoting CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;efflux from whole ecosystems only when marsh plants were present.&amp;nbsp;&lt;/span&gt;&lt;i&gt;e&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;is projected to stimulate C gain 2.2-fold for forested wetlands and oligohaline marsh and 2.9-fold for forest-marsh mixture through greater CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;uptake. However, this comes at a cost of stimulated CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;flux by 1.4-to-1.7-fold in mixed and marsh communities versus reduced CH&lt;/span&gt;&lt;sub&gt;4&lt;/sub&gt;&lt;span&gt;&amp;nbsp;fluxes with&amp;nbsp;&lt;/span&gt;&lt;i&gt;e&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;by forest and mudflat communities, perhaps through different oxidation pathways. Freshwater forested wetlands limited greenhouse gas emissions compared with transitional habitats, oligohaline marshes, and mudflats as atmospheric CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;concentrations increased. Stimulated C uptake in marshes may not offset higher methane emissions from these systems, potentially facilitating greater warming in a future with elevated atmospheric CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.ecss.2025.109385</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Elevated CO2 enables brackish marsh transgression into freshwater forested wetlands while stimulating CH4 emissions</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>