The seasonal courses of methane (CH4) and nitrous oxide (N2O) fluxes were simultaneously monitore... more The seasonal courses of methane (CH4) and nitrous oxide (N2O) fluxes were simultaneously monitored in a paddy field using a closed chamber system with automated gas sampling and analyzing equipment. Water management and fertilizer application practices followed Japanese conventional ones. CH4 flux gradually increased after the first flood irrigation of the field and reached ∼150 mg CH4 m−2 d−1 at the beginning of July. After the first summer drainage, however, CH4 flux dropped rapidly to almost zero within a few days. CH4 flux then gradually increased again according to intermittent flood irrigations, but was much less than that before the first drainage. Immediately after the first flood irrigation, N2O flux rapidly increased, although its temporal peak lasted only within a few days. During the subsequent continuously and intermittently flooded periods, N2O flux remained at almost zero until the final drainage, except for slight and temporal peaks just after the top‐dress applicati...
The seasonal courses of methane (CH4) and nitrous oxide (N2O) fluxes were simultaneously monitore... more The seasonal courses of methane (CH4) and nitrous oxide (N2O) fluxes were simultaneously monitored in a paddy field using a closed chamber system with automated gas sampling and analyzing equipment. Water management and fertilizer application practices followed Japanese conventional ones. CH4 flux gradually increased after the first flood irrigation of the field and reached ∼150 mg CH4 m−2 d−1 at the beginning of July. After the first summer drainage, however, CH4 flux dropped rapidly to almost zero within a few days. CH4 flux then gradually increased again according to intermittent flood irrigations, but was much less than that before the first drainage. Immediately after the first flood irrigation, N2O flux rapidly increased, although its temporal peak lasted only within a few days. During the subsequent continuously and intermittently flooded periods, N2O flux remained at almost zero until the final drainage, except for slight and temporal peaks just after the top‐dress applicati...
Uploads
Papers by Rota Wagai