稳定同位素技术在陆地生态系统氮循环中的应用

Application of Stable Isotope Technique to Nitrogen Cycling in Terrestrial Ecosystems

人类活动导致的氮沉降增加对陆地生态系统有着复杂的影响,氮氧化合物排放过量时生态系统将会达到氮饱和,这将改变陆地生态系统的养分循环。为了对陆地生态系统氮循环进行更深入了解,稳定同位素技术由于其测量简单,已被广泛应用于大尺度研究中。稳定同位素技术可以帮助了解陆地生态系统氮循环规律及影响因素,δ15N可能够提供陆地生态系统如何对氮添加进行响应的信息。但目前研究多集中于某些特定过程,而非对系统进行综合性研究。为此,本文从稳定同位素的基本原理,稳定同位素技术在陆地生态系统氮循环研究中的应用进展,以及当前研究中存在的不足等方面进行总结,旨在为以后的研究提供理论基础。

The increase of nitrogen deposition caused by human activities has a complex effect on terrestrial ecosystems. When nitrogen oxides are emitted excessively, the ecosystem will reach nitrogen saturation, which will change the nutrient cycle of terrestrial ecosystems. To understand the nitrogen cycle in terrestrial ecosystems more deeply, the stable isotope technique has been widely used in large-scale studies due to its simplicity in measurement. Stable isotope technology can help to understand the nitrogen cycle and its influencing factors in terrestrial ecosystems, and δ15N can provide information on how terrestrial ecosystems respond to nitrogen addition. However, the current research focuses on some specific processes, rather than a comprehensive study of the system. In this paper, the basic principles of stable isotopes, the application of stable isotopes in the study of the nitrogen cycle in terrestrial ecosystems, and summarize the shortcomings of the current research, in order to provide theoretical basis for the future research.