硝酸盐氮氧稳定同位素分馏过程记录的海洋氮循环研究进展

被引:13
作者
洪义国
机构
[1] 热带海洋环境国家重点实验室,中国科学院南海海洋研究所
关键词
海洋氮素生物地球化学循环; 硝酸盐; 氮氧稳定同位素分馏;
D O I
暂无
中图分类号
P736.4 [海洋地球化学];
学科分类号
070902 ;
摘要
海洋生态系统中的氮素生物地球化学循环主要是由微生物的代谢过程来驱动的,包括氮固定、氮同化、硝化以及反硝化和厌氧氨氧化过程,这些过程都伴随着不同程度的氮氧同位素的分馏,直接影响着海洋硝酸盐中的氮氧稳定同位素组成。因此,通过检测海洋硝酸盐中的氮氧稳定同位素信号,就可以捕捉到海洋中发生的具体氮素循环过程。细菌反硝化法是这一研究最有力的手段,通过细菌的作用把硝酸盐中记录的氮氧稳定同位素信号转化到N2O中,再通过痕量N2O的同位素质谱测定和分析,准确地反映海洋中发生的氮素转化过程。硝酸盐氮氧稳定同位素分馏过程为深入理解海洋氮循环提供了一个重要的工具,有力推动了海洋氮素生物地球化学的研究,在近10年来取得了重要进展。
引用
收藏
页码:751 / 764
页数:14
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