5 Conclusion
Soil N mineralization and availability are crucial for ecosystem
productivity and carbon sequestration, especially in the context of
global climate change or anthropogenic disturbances. The frequency of N
addition and mowing had only occasional effects on those variables,
which likely due to the effects of the frequency of N addition and
mowing were offset by the effects of the levels of N addition, or that
interactions of these with other human or environmental factors that we
did not examine occurred. Nevertheless, GA and GN were significantly
affected by N addition frequency and mowing especially at the highest N
addition level. Consequently, long-term research on the response of N
cycling to human activities or environmental variables is needed to
further improve our understanding of the response mechanism of N cycling
to climatic change.