N是植物生长必需的矿质元素,土壤中N的迁移转化既影响土壤的供N能力和林地生产力,也与环境污染紧密相关,一直是研究的热点领域。文中综述了土壤N的来源和转化问题,重点介绍了凋落物归还、施肥、大气沉降和生物固N等4个来源以及矿化与固持、反硝化、氨挥发和硝态N淋溶等4个转化,讨论了需进一步加强的研究领域,以期为以后的研究提供思路和参考。 N is a mineral element necessary for plant growth. The migration and transformation of N in soil not only affects soil N supply capacity and forest productivity, but also is closely related to environmental pollution, which has been a hot area of ​​research. In this paper, the sources and transformation of soil N are reviewed. Four sources of soil N, such as litter return, fertilization, atmospheric sedimentation and biological fixation, as well as mineralization and holding, denitrification, ammonia volatilization and nitrate N leaching are reviewed Transformation, discussed the need to further strengthen the research area, with a view to provide ideas and reference for future research.