Denitrification in Lake 227 During Summer Stratification. Chan, Y., K. & Campbell, N., E., R. Canadian Journal of Fisheries and Aquatic Sciences, 37(3):506-512, 1980.
Denitrification in Lake 227 During Summer Stratification [pdf]Paper  abstract   bibtex   
In situ denitrification in Lake 227 was assayed by using 15N-labeled N0₃- during summer stratification periods in 1973,1974, and 1975. Dissolved oxygen and NO₃- concentrations were the main factors controlling denitrification in the water column and in sediments. The epilimnetic sediment-water interface was a more significant site of natural denitrification when compared to the oxygen-limiting (dissolved oxygen less than 0.2 mg/L) thermocline and the anoxic hypolimnion. Epilimnetic sediment denitrification rates averaged about 15 mg N.m-2·d-1. Nearly all of the NO₃- that mixed into the surficial sediments was denitrified. Alone, epilimnetic denitrification removed 1.4% of the NO₃- added annually. Below the euphotic zone, sediments would provide an efficient sink for N0₃--N without sirnuBtaneous initiation of eutrophication.

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