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<p>Sediment enhancement is a management strategy to improve salt marsh resilience to sea-level rise, but recovery timelines of this technique, especially across sediment addition depths, require further study. This study evaluated daytime greenhouse gas fluxes, vegetation, net elevation change, and soil properties of two sediment enhancement sites with differing sediment addition depths and recovery stages: Ninigret (Average 37&#xa0;cm sediment added, 5–6 growing seasons post- placement) and Quonochontaug (Average 57&#xa0;cm sediment added, 2–4 growing seasons post- placement). Vegetation recovered more rapidly than other ecosystem functions. At Quonochontaug, total vegetation cover steadily increased within 2–4 growing seasons following sediment placement, while at Ninigret, restored sites exhibited greater total vegetation cover than the Control after six growing seasons. In contrast, several ecological and biogeochemical metrics indicated continued recovery. Although sediment enhancement sites maintained daytime greenhouse gas sink capacity, the Control exhibited stronger net greenhouse gas uptake, indicating the sediment enhancement sites are still recovering. Soil properties reflected similar recovery patterns, with the Control showing higher percent organic matter, root density, and soil moisture than sediment enhancement sites. These findings suggest that full restoration of marsh function following sediment enhancement exceeding 30&#xa0;cm may take a decade or longer. While sediment enhancement remains an effective strategy for improving long-term marsh resilience to sea-level rise, some ecosystem services may be temporarily reduced during recovery. Unlike prior studies that focused on thin-layer applications (&lt; 15&#xa0;cm), this research provides a comprehensive assessment of thicker sediment placements (&gt; 30&#xa0;cm) to inform restoration planning and management decisions.</p>

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Assessing Recovery: Examination of Greenhouse Gas Fluxes, Soil Characteristics, and Vegetation in Sediment Enhanced Marshes

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Danielle C. Perry,
  • Nia Bartolucci,
  • Cathleen Wigand,
  • Kenneth B. Raposa,
  • Joseph Loffredo,
  • Wenley Ferguson,
  • Robinson W. Fulweiler

摘要

Sediment enhancement is a management strategy to improve salt marsh resilience to sea-level rise, but recovery timelines of this technique, especially across sediment addition depths, require further study. This study evaluated daytime greenhouse gas fluxes, vegetation, net elevation change, and soil properties of two sediment enhancement sites with differing sediment addition depths and recovery stages: Ninigret (Average 37 cm sediment added, 5–6 growing seasons post- placement) and Quonochontaug (Average 57 cm sediment added, 2–4 growing seasons post- placement). Vegetation recovered more rapidly than other ecosystem functions. At Quonochontaug, total vegetation cover steadily increased within 2–4 growing seasons following sediment placement, while at Ninigret, restored sites exhibited greater total vegetation cover than the Control after six growing seasons. In contrast, several ecological and biogeochemical metrics indicated continued recovery. Although sediment enhancement sites maintained daytime greenhouse gas sink capacity, the Control exhibited stronger net greenhouse gas uptake, indicating the sediment enhancement sites are still recovering. Soil properties reflected similar recovery patterns, with the Control showing higher percent organic matter, root density, and soil moisture than sediment enhancement sites. These findings suggest that full restoration of marsh function following sediment enhancement exceeding 30 cm may take a decade or longer. While sediment enhancement remains an effective strategy for improving long-term marsh resilience to sea-level rise, some ecosystem services may be temporarily reduced during recovery. Unlike prior studies that focused on thin-layer applications (< 15 cm), this research provides a comprehensive assessment of thicker sediment placements (> 30 cm) to inform restoration planning and management decisions.