Title page for ETD etd-11082007-155709

Type of Document Master's Thesis
Author Izdepski, Caleb W.
Author's Email Address cizdep1@lsu.edu
URN etd-11082007-155709
Title Early Flotant Establishment and Growth Dynamics in a Nutrient Amended Wetland in the Lower Missisippi River Delta
Degree Master of Science (M.S.)
Department Oceanography & Coastal Sciences
Advisory Committee
Advisor Name Title
John W. Day, Jr. Committee Co-Chair
Richard Keim Committee Co-Chair
Charles E. Sasser Committee Member
  • nutrients
  • isotopes
  • wetland assimilation
  • water quality
  • floating marshes
Date of Defense 2007-10-16
Availability unrestricted
Nutrient dynamics and seasonal marsh growth were examined in a newly formed Panicum virgatum floating marsh at Thibodaux LA. The floating marsh formed in a cleared area of forested wetland receiving secondarily treated effluent. Net Areal Primary Productivity (NAPP), total belowground biomass, NO3, and δ15N ratios varied significantly (P <0.05) along a 75m marsh transect while mean δ13C varied between plant species. The upland end of the transect had the highest NAPP (3876 g m-2y-1), total belowground biomass (4079.0 298.5 g m-2), and mean NO3 (5.4 2.9 mg l-1). The mean floating-marsh δ15N of H. umbellata was less enriched at 0-75 m (9.69 1.9) compared to 100-200 m (20.99 3.8). The δ13C of the belowground peat mat of the floating marsh was similar to P. virgatum but not H. umbellata, indicating that P. virgatum was forming the mat. There was a significant decrease in NAPP, total belowground biomass, NO3 and δ15N enrichment across the 75 m transect. Nutrient availability affected NAPP and δ15N. Floating marsh NAPP in the 0-45 m was greater than most reported values for floating marsh. These results suggest that nutreint rich freshwater can promote restoration of floating marshes.
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