Open AccessChemistry of Sediment Pore Water in Aquaculture Ponds Built on Clayey Ultisols at Auburn, Alabama
Author(s) -
Masuda Kiyoshi,
Boyd Claude E.
Publication year - 1994
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1994.tb00223.x
Subject(s) - ultisol , pore water pressure , phosphorus , sediment , soil water , environmental chemistry , organic matter , environmental science , chemistry , soil science , geology , paleontology , geotechnical engineering , organic chemistry
The composition of sediment pore water was determined for ponds constructed on clayey Ultisols at Auburn, Alabama. Pore water was anaerobic and contained much higher concentrations of ferrous iron (Fe 2+ ), soluble reactive phosphorus (SRP), total phosphorus (TP), total ammonia‐nitrogen (TAN), and sulfide (S 2− ) than surface or bottom waters. Concentrations of SRP and TP in pore water were higher in ponds with high soil phosphorus concentrations than in a new pond with less soil phosphorus. Increased concentrations of organic matter in soil or larger inputs of feed to ponds favored greater microbial activity in soils and higher concentrations of TAN in pore water. The pH of pore water was 6.5–7.0, and pH was apparently controlled by the equilibrium:Movement of Fe 2+ , SRP, and S 2− from pore water into pond water apparently was prevented by the oxidized layer of soil just below the soil‐water interface. Pond managers should concentrate on maintaining this oxidized layer to reduce the tendency for toxic substances to diffuse into the pond water.