抄録
This paper summarizes the fundamental concept of the stable isotope studies with emphasis on nitrogen isotope ratio based on unique characteristics of this parameter: interdiscirplinary nature, a chemical finger print of biogenic substances, and provinding a key to enter the new world of isotopomers. One primary goal of nitrogen isotope biogeochemical studies is elucidation of a general rule on the partition of the isotopes in molecules, biogenic materials, individuals and their cycling in biogeochemical systems. Current efforts on the general aspect of nitrogen isotope distribution are summarized.
