Abstract
Denitrifying activities in two freshwater lakes, Lake Kizaki during October to December 1986 and Lake Fukami-ike during July to August 1985 and in July 1986, were estimated by the acetylene blockage method. Relationships between the denitrifying activities and the concentration of denitrifying intermediates such as NO2- and N2O in the water column of the two lakes were analyzed. Denitrifying activity in L. Fukami-ike was essentially dependent on NO2-concentration, in two ways. A positive correlation was found between denitrifying activity and in situ NO2- concentration, while in some cases remarkable denitrifying activities were found in the NO2--depleted layer and correlated with the maximally accumulated NO2- concentration. On the other hand, a better correlation of denitrifying activity with N2O concentration was found in L. Kizaki. Mineralization of 14C-acetate and its coupling with the denitrification were also compared in the two lakes. Mineralized 14CO2 plotted against the total uptaken 14C-acetate fell in a regression line with the same slope of 0.34 not only even in NO3--enhanced uptake of the substrate, but also in both L. Fukami-ike (at 4-4.5 m depth on 20 July 1986) and L. Kizaki (at 21-24 m depth on 2 December 1986).
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Schedule a callMore From: Japanese Journal of Limnology (Rikusuigaku Zasshi)
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