We examine daily and seasonal variations in CO2 exchange of paddy fields under water-saving irrigation.
Frequent alternations of wetting and drying processes increase the ecosystem reparation, and led smaller net CO2 absorption.
Daytime net CO2 absorption and net CO2 release at nighttime measured by STC method were overestimated compared to those measured by EC method.
Higher Q10 values were observed for paddy fields under water-saving irrigation.
Rice plants with water-saving irrigation displayed higher light saturation points during heading-flowering and milk stages.