Beitrag
Phosphate transport during hypolimnetic aeration
Lean, D. R. S.; McQueen, D. J.; Story, V. A.
Archiv für Hydrobiologie Volume 108 Number 2 (1986), p. 269 - 280
23 Literaturangaben
veröffentlicht: Dec 19, 1986
DOI: 10.1127/archiv-hydrobiol/108/1986/269
ArtNo. ESP141010802007, Preis: 29.00 €
Abstract
By adding radioactive phosphate to the hypolimnion of large (550 m³) enclosures, it was shown that the transport rate for phosphate to the sediments under anaerobic conditions was insignificant. With hypolimnetic aeration the rate constant from the hypolimnion to the sediments was measureable (about 1 % · day -1) giving a phosphorus flux to the sediments of 4 mg P · m-2 · day-1 on an areal basis. Adding 300 µg · l-1 of FeCl · 5H2O to the hypolimnion increased the transport rate to the sediments fivefold in the aerated enclosure but the rate for the anaerobic enclosure remained at the limit of detection. Consequently, available iron in the hypolimnion of lakes is necessary for the effective reduction of phosphorus by hypolimnetic aeration. Although isotope was transported to the lower part of the metalimnion during aeration, none reached the epilimnion.
Schlagworte
radioactive • phosphate • sediments • phosphorus