Conversion of winter flooded rice paddy planting to rice-wheat rotation decreased methane emissions during the rice-growing seasons

•CH4 emissions decreased during the rice-growing seasons after the conversion of RF to RW.•The Q10 of CH4 emissions was higher for RW-CN than that for RF-CN.•The soil DOC positively affected CH4 emissions in both RF-CN and RW-CN treatmnets, while the soil DIN negatively affected CH4 emissions.