The invention discloses a method for fixing carbon and reducing emission in south paddy fields in winter. The method comprises steps of first, applying green
fertilizer and planting in paddy fields in winter and re-applying green
fertilizer in a broadcast
sowing way before late rice harvest, second, covering the paddy fields via straws in winter, covering the straws on the paddy fields after paddy harvest rather than burning, third, conducting a
moisture management mode
smoothing water discharging, preventing waterlogging for the paddy fields in the whole winter via digging water discharging trenches, reducing
methane emission via removing waterlogging environment, reducing emission via reducing substrate produced by
greenhouse air, and fourth, turning over the paddy fields and restoring the green
fertilizer and re-applying the same to the field, smashing the green fertilizer and harvesting before spring ploughing, conducting water-ploughing and turning the green fertilizer into the mud, restoring carbon and
nitrogen nutrients fixed by the green fertilizer in winter into the
paddy field soil in the above way, and maintaining long
term effect of carbon fixation and emission reduction via addition of the
soil carbon and
nitrogen storage. The method is simple and convenient to operate, and enables the paddy fields in a fallow period to be effectively utilized; and beneficial effects of carbon fixation and emission reduction in winter can be achieved.