CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China CH4 and N2O emissions from phaeozem rice field and their mitigative measures CH4 and N2O fluxes from late-rice fields in Guangzhou region and their affecting factors Relationship bwtween CH4 and N2O emissions from rice field and its microbiological mechanism and impacting factors CH4 and N2O emission from a rice field and effect of Azolla and fertilitaion on them