Lake Kizaki, Japan

Subsequent nitrification ofthis ammonium, and denitrification of the resulting nitrate, both discriminate strongly against N (Table I). In the last case, selective loss of the resulting " N2 may leave an isotopically enriched residualDINpool, particularly when denitrification occurs within the water column. An example is provided by Lake Kizaki, Japan, where during the summer stratification period the of the residual deepwater N03 was found to be +15.1%c, whereas shallow-water NO3 had a of -2.2 (Yoshioka et al 1988). 

Yoshioka, T, H. Hayashi E. Wada, 1989. Seasonal variations of carbon and nitrogen isotope ratios of plankton and sinking particles in Lake Kizaki. Japan. J. Limnol. 50 313-320. 

Yoshioka, T, E. Wada Y. Saijo. 1988. Isotopic characterization of Lake Kizaki and Lake Suwa. Japan. J. Limnol. 49 119-128. 

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