| 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 |
|
| Keywords |
- nutrients
- isotopes
- wetland assimilation
- water quality
- floating marshes
|
| Date of Defense |
2007-10-16 |
| Availability |
unrestricted |
Abstract
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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| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
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56K Modem |
ISDN (64 Kb) |
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Izdepski_thesis.pdf |
13.94 Mb |
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