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Phosphorus Cycling in Wetland Soils

The Importance of Phosphate Diesters

^a Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Republic of Panama
^b Everglades Division, South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL 33406

View larger version (15K): [in a new window]   Fig. 1. Map showing locations of sampling sites in Water Conservation Areas 1 and 2A in the Florida Everglades, USA, indicating points of discharge into each of the areas (S5A, G251, G310, ACME 1 & 2, S6, S10s, and S7).

View larger version (25K): [in a new window]   Fig. 2. Solution 31P nuclear magnetic resonance (NMR) spectra of NaOH–EDTA extracts of benthic floc and soil (0–10 cm) from Water Conservation Area 1 in the Florida Everglades, USA. Spectra are plotted with 8-Hz line broadening and scaled to the height of the phosphate signal at 6.1 ppm.

View larger version (24K): [in a new window]   Fig. 3. Solution 31P nuclear magnetic resonance (NMR) spectra of NaOH–EDTA extracts of benthic floc and soil (0–10 cm) from Water Conservation Area 2A in the Florida Everglades, USA. Spectra are plotted with 8-Hz line broadening and scaled to the height of the phosphate signal at 6.1 ppm.

View larger version (18K): [in a new window]   Fig. 4. Solution 31P NMR spectrum of a NaOH–EDTA extract of benthic floc from the moderately enriched transitional site (F4) in Water Conservation Area 2A in the Florida Everglades, USA. Only the phosphate monoester region is shown and is plotted with 1-Hz line broadening to show fine resolution. Signals at 5.24 and 4.91 ppm are degradation products of phospholipids in alkaline solution, while the remaining signals are the mononucleotide degradation products of RNA in alkaline solution (Turner et al., 2003b).