Abstract
CO2 and CH4 fluxes were measured in a barley-rice double cropping field over a one-year period. The characteristics of the fluxes in relation to field management and their seasonal variation were investigated in detail. Net ecosystem CO2 exchange (NEE) and ecosystem respiration (RE) were estimated by the eddy covariance method. RE of the drained rice paddy was larger than that of the flooded rice paddy, because flood water restricted heterotrophic respiration and below-ground autotrophic respiration. Gross primary production showed seasonal variation corresponding to each crop growth. As a result, NEE in barley, rice and the fallow period was -255, -350 and 60 gC m-2, respectively. CH4 flux showed diurnal variation, peaking during daytime; its value increased during the course of flood days and showed good agreement with air temperature. Finally, we obtained rough estimates of net biome production (NBP).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
