15N自然丰度法在生态系统氮素循环研究中的应用

稳定性同位素技术是现代生态学研究中的一门新兴技术，在生态学研究的诸多领域都展示了广阔的应用前景，其中，稳定性同位素＾１５Ｎ自然丰度法近年来在生态系统氮素循环研究中发挥了正在发挥着极为重要的作用，首先简述了自然生态系统氮素循环诸过程中的＾１５Ｎ同位素分馏机制，然后，在此基础上，综述了＾１５Ｎ自然丰度法的基本原理与方法，列举了近年 来此法在生物固氮及氮素转化过程研究中的一些应用实例，并预测了该方法在国

APPLICATION OF 15N NATURAL ABUNDANCE METHOD TO THE RESEARCH ON NITROGEN CYCLING IN NATURAL ECOSYSTEMS

In recent years there has been a prosperous application of stable isotope technique, a new method applied in modern ecology research, in many ecological research fields. Of all kinds of stable isotopes, 15 N stable isotope technique plays a very important role in the research on nitrogen cycling in natural ecosystems and is still functioning efficiently now. In this article, the nitrogen cycling processes in natural ecosystems and the related 15 N isotopic fractionation during every processes were introduced. The theory and method about 15 N natural abundance method were reviewed in detail, respectively. Some case studies on nitrogen cycling applying 15 N natural abundance method were listed.