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<p>The Wetland Reserve Easement (WRE/WRP) programs, administered by the United States Department of Agriculture, restore freshwater wetlands in agricultural landscapes to reestablish key ecosystem functions. While these systems provide benefits such as wildlife habitat and carbon sequestration, potential carbon losses via greenhouse gas emissions—specifically carbon dioxide (CO₂) and methane (CH₄)—remain insufficiently evaluated. This study investigated carbon cycling across ten seasonal wetlands at Archbold Reserve and Buck Island Ranch in south-central Florida, both managed by Archbold Biological Station. Sites were categorized as grazed-restored, ungrazed-restored, or grazed-unrestored (control). Carbon fluxes (CO₂ and CH₄) were measured every two to three months using a LI-7810 LI-COR trace gas analyzer. Hydrology was monitored through groundwater and surface water levels, and soil and vegetation were analyzed for carbon, nitrogen, and phosphorus. Generalized linear mixed models revealed that hydrology, water residence time, and grazing strongly influence carbon storage and greenhouse gas emissions. Well-drained, ephemeral wetlands primarily lost carbon through CO₂ emissions, whereas poorly drained wetlands promoted CH₄ production due to lower oxygen availability. Grazing also increased methane emissions. Restored wetlands exhibited significantly lower CO₂ flux than unrestored sites, indicating that restoration and increased water residence time reduce carbon loss. Global warming potential estimates further showed that unrestored grazed wetlands had the highest warming potential, while restored sites—regardless of grazing—performed better. Overall, these findings underscore the importance of wetland restoration and management in reducing greenhouse gas emissions while enhancing ecosystem carbon storage.</p>

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An Assessment of Carbon Cycling in Restored Wetland Easements on Ranchland in South Florida, USA

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Tracey Schafer,
  • Taylor Burgess,
  • Joseph Prenger,
  • Elizabeth Boughton,
  • Grégory Sonnier,
  • Todd Z. Osborne

摘要

The Wetland Reserve Easement (WRE/WRP) programs, administered by the United States Department of Agriculture, restore freshwater wetlands in agricultural landscapes to reestablish key ecosystem functions. While these systems provide benefits such as wildlife habitat and carbon sequestration, potential carbon losses via greenhouse gas emissions—specifically carbon dioxide (CO₂) and methane (CH₄)—remain insufficiently evaluated. This study investigated carbon cycling across ten seasonal wetlands at Archbold Reserve and Buck Island Ranch in south-central Florida, both managed by Archbold Biological Station. Sites were categorized as grazed-restored, ungrazed-restored, or grazed-unrestored (control). Carbon fluxes (CO₂ and CH₄) were measured every two to three months using a LI-7810 LI-COR trace gas analyzer. Hydrology was monitored through groundwater and surface water levels, and soil and vegetation were analyzed for carbon, nitrogen, and phosphorus. Generalized linear mixed models revealed that hydrology, water residence time, and grazing strongly influence carbon storage and greenhouse gas emissions. Well-drained, ephemeral wetlands primarily lost carbon through CO₂ emissions, whereas poorly drained wetlands promoted CH₄ production due to lower oxygen availability. Grazing also increased methane emissions. Restored wetlands exhibited significantly lower CO₂ flux than unrestored sites, indicating that restoration and increased water residence time reduce carbon loss. Global warming potential estimates further showed that unrestored grazed wetlands had the highest warming potential, while restored sites—regardless of grazing—performed better. Overall, these findings underscore the importance of wetland restoration and management in reducing greenhouse gas emissions while enhancing ecosystem carbon storage.