Riverine N transport is the largest sink of N losses from Land,therefore, it is important process of N biogeochemical cycles.N denitrification in rivers is a key process between water/air interface.

• 我国河流输送氮已成为陆地氮最主要的汇，因此，河流输送氮过程是氮生物地球化学循环重要的过程之一，而河流氮的反硝化过程是氮在水/气界面间迁移转化的重要过程。