A preliminary study on N2O Production through Nitrification in Lake Kizaki

Abstract

In the hypolimnion of Lake Kizaki, an increase of N2O concentration was observed with time, concomitant with an increase of NO3- concentration and a decrease of oxygen concentration. In addition, the amount of apparent N2O production (ΔN2O) was found to be linearly correlated with that of apparent oxygen consumption (-ΔO2). These facts suggest that N2O was produced during the process of nitrification in the hypolimnion of Lake Kizaki. The mole fraction of ΔN2O/-ΔO2 was found to be 2.7X10-4, consistent with the value of 1.0X10-4, obtained by YOSHINARI (1976) in the western North Atlantic Ocean. © 1988, The Japanese Society of Limnology. All rights reserved.