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ABSTRACT
A laboratory study was conducted to determine the role of N transformations in ponds receiving inorganic N-rich effluents from septic fields, agricultural, and pasture watersheds. Undisturbed sediment columns were obtained from three ponds. Floodwater in the columns was enriched with either 15NH+4-N or 15NO–3-N. Ammonium removal rates ranged from 55 to 85 mg N m–2 d–1, while NO–3-N removal rates ranged from 48 to 71 mg N m–2 d–1. Twenty-three to 49% of floodwater 15NH+4-N diffused into the sediment during a 22-d incubation period and was recovered in 15NH+4-N (6–12% of the floodwater 15NH+4-N) and organic 15N fractions (14–37% of the floodwater 15NH+4-N). When 15NO–3-N was added to the floodwater, about 7% was tied up in the sediment. Ponds receiving effluents from septic tanks and pastured areas retained less floodwater N in the sediment compared to sediments of the pond receiving runoff from agricultural watershed.
Key Words: N removal • nitrification • denitrification • retention ponds • aquatic systems • drainage effluents • watershed
1 Joint contribution from North Carolina A&T State Univ. and Univ. of Florida. Florida Agric. Exp. Stn. Journal Series no. 6499.
2 Associate Professor, Dep. of Plant Science and Technology, North Carolina A&T State Univ., Greensboro, NC 27411; and professor, Univ. of Florida, Inst. of Food and Agric. Sci. (IFAS), Central Florida Res. and Education Center, Sanford, FL 32771, respectively.
Received for publication May 21, 1985.
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