Sediment Accretion in Tidal Freshwater Forests and Oligohaline Marshes of the Waccamaw and Savannah Rivers, USA

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• 作者：Scott H. Ensign (1)
  Cliff R. Hupp (1)
  Gregory B. Noe (1)
  Ken W. Krauss (2)
  Camille L. Stagg (2)
  
• 关键词：Tidal freshwater wetland ; Tidal freshwater forested wetland ; Tidal swamp ; Tidal freshwater marsh ; Sediment accretion ; Sea level rise ; River geomorphology ; Coastal geomorphology
• 刊名：Estuaries and Coasts
• 出版年：2014
• 出版时间：September 2014
• 年：2014
• 卷：37
• 期：5
• 页码：1107-1119
• 全文大小：703 KB
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• 作者单位：Scott H. Ensign (1)
  Cliff R. Hupp (1)
  Gregory B. Noe (1)
  Ken W. Krauss (2)
  Camille L. Stagg (2)
  
  1. National Research Program, U.S. Geological Survey, Reston, VA, USA
  2. National Wetlands Research Center, U.S. Geological Survey, Lafayette, LA, USA
  
• ISSN：1559-2731

文摘

Sediment accretion was measured at four sites in varying stages of forest-to-marsh succession along a fresh-to-oligohaline gradient on the Waccamaw River and its tributary Turkey Creek (Coastal Plain watersheds, South Carolina) and the Savannah River (Piedmont watershed, South Carolina and Georgia). Sites included tidal freshwater forests, moderately salt-impacted forests at the freshwater–oligohaline transition, highly salt-impacted forests, and oligohaline marshes. Sediment accretion was measured by use of feldspar marker pads for 2.5?year; accessory information on wetland inundation, canopy litterfall, herbaceous production, and soil characteristics were also collected. Sediment accretion ranged from 4.5?mm?year? at moderately salt-impacted forest on the Savannah River to 19.1?mm?year? at its relict, highly salt-impacted forest downstream. Oligohaline marsh sediment accretion was 1.5-.5 times greater than in tidal freshwater forests. Overall, there was no significant difference in accretion rate between rivers with contrasting sediment loads. Accretion was significantly higher in hollows than on hummocks in tidal freshwater forests. Organic sediment accretion was similar to autochthonous litter production at all sites, but inorganic sediment constituted the majority of accretion at both marshes and the Savannah River highly salt-impacted forest. A strong correlation between inorganic sediment accumulation and autochthonous litter production indicated a positive feedback between herbaceous plant production and allochthonous sediment deposition. The similarity in rates of sediment accretion and sea level rise in tidal freshwater forests indicates that these habitats may become permanently inundated if the rate of sea level rise increases.