Advances in Research on Nitrogen Cycle in Wetlands and Its Influence on Environmental Change

Abstract:

This paper illustrates the input ways including elevated N deposition,biological N fixation,man-made N and runoff N input;the output processes including plant harvest,soil NH3 volatilization,denitrification and leaching,runoff output,etc;and biogeochemical cycle of nitrogen through N fixation,mineralization (ammonification),nitrification,denitrification in wetlands as well as the relationship among them.To obtain quantitative relationships of N,C and P is one of the main problems in the present research,in which the key issue is to investigate relations between N migration amount and environmental factors in the wetland system.The influence of wetland nitrogen cycle on the global environment is also discussed.

Key words:wetland; nitrogen cycle; mineralization; nitrification; denitrification; environment change