Abstract:

Nitrification - denitrification are two important processes in soil nitrogen cycle. N2O and N2, generated from their biochemical processes, which not only will cause nitrogen losses and reducing nitrogen use efficiency, but also increase the concentrations of greenhouse gases, and bring about environmental damage. Therefore, nitrification and denitrification has attracted more attention, whether from an agricultural point of view, or from an environmental point of view. Based on the reports at home and abroad in recent years, this paper describes N loss from denitrification and N2O emissions on various agro-ecological system, introduces some measures to reduce N loss from denitrification and N2O emission, and the future research directions to be carried out are also suggested．