Vaithiyanathan, P. and C.J. Richardson. 1997. Nutrient profiles in the Everglades: examination along the eutrophication gradient The Science of the Total Environment 205: 81-95

Abstract: We examined the concentration profiles of nutrients in the surface water, soil, and pore water along the eutrophication gradient of the Water Conservation Area-2A (WCA-2A) in the northern Everglades. Phosphorus levels in the surface waters contributed by the agricultural runoff showed an exponential decrease downstream of the inflow structures attaining background values of 7-12, 7-9, and 5-6 m g 1–1 of TP, TDP, and PO4–P, respectively, at distances of 8-10 km. The pore water PO4–P concentration in the oligotrophic areas ranged between 5 and 10 m g 1–1. Molar ratios of dissolved inorganic N and P suggest a possible switch in nutrient limitation in the surface water from P in the oligotrophic areas to N in the eutrophic areas (DIN:DIP~ 5). External nutrient loading has also contributed to three-to four-fold increase in soil TP concentration and enhanced pore water PO4–P in the northern marshes.

Key words: Nutrients; Phosphorus; Wetland; Everglades

Reprinted from Science of the Total Environment Vol. 205. Vaithiyanathan, P and C.J. Richardson: Nutrient profiles in the Everglades: examination along the eutrophication gradient. Pp. 81-95. 1997, with permission from Elsevier Science.

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