稳定氮同位素示踪技术在湿地脱氮研究中的应用进展

稳定同位素示踪技术广泛应用于现代环境科学研究中。其中，15^N作为氮循环过程唯一适用的示踪剂，在有关氮循环引发的环境污染问题的研究中发挥了极其重要的作用。湿地脱氮是湿地水质净化功能的重要体现，此过程有助于有效地减少受纳水体的外源氮负荷。在概述稳定氮同位素示踪原理和湿地脱氮过程的基础上，从湿地脱氮驱动机制、关键限制因素分析、脱氮定量研究3方面阐述15^N示踪技术在湿地脱氮研究中的应用，并展望了该技术在湿地脱氮研究中的应用前景。

Advance in Application of Stable Nitrogen Isotope Trace Technique in Wetland Nitrogen Removal Research

As an applied technology in modern environmental science research,stable isotope technique has been extensively applied to many fields of environmental science.Nitrogen-15(15N),a unique tracer for nitrogen cycling process,plays an important role in research on environmental pollution problem induced by N cycling process.Wetland is increasingly used to lower the nitrogen load from industrial point sources and agricultural non-point sources to inland and coastal waters since removal of nitrogen in wetland occurs when runoff flows through wetland,which leads to water quality well in part.Based on the theory of 15N tracing and wetland nitrogen removal,the application of stable nitrogen isotope trace technique on distinguishing wetland nitrogen removal mechanisms,determining key limiting factors,estimating removal efficiency and establishing removal nitrogen model were described in this paper.Meanwhile drawbacks and possible application fields of 15N as a tracer in research on wetland nitrogen removal are indicated.