EFFECTS OF STRAW RETURNING AND WATER MANAGEMENT ON YIELD AND NON-CO2 GREENHOUSE GAS EMISSIONS IN COLD BLACK SOIL PADDIES

In order to explore the effective management measures of increasing yield and reducing nonCO(2) greenhouse gas (CH4 and N2O) emission in the cold black soil paddy field, field experiments were carried out. This paper analyzed the impact of straw returning and different irrigation methods on rice field yield, greenhouse gas emissions, global warming potential (GWP) and greenhouse gas emission intensity (GHGI). The results showed that compared with the treatment without straw returning, the yield of straw returning treatment increased by 11.79% annually, CH4 emissions increased by 62.71% annually, N2O emissions decreased by 1.28% annually, GWP and GHGI increased by 60.90% and 45.58% annually, respectively. Compared with conventional flooding treatment, the yield of controlled irrigation treatment increased by 2.68% annually, the difference was not significant, CH4 emissions decreased by 56.42% annually, N2O emissions increased by 133.41%, GWP and GHGI decreased by 54.89% and 55.93% annually, respectively. Straw returning and controlled irrigation had significant interaction on GWP and GHGI, but not significant interaction on yield. The GHGI values of the four treatments were as follows: KFH0< KFHS< CFH0< CFHS. Therefore, controlled irrigation is an irrigation method with stable rice yield and good greenhouse gas emission reduction effect. Straw returning and controlled irrigation can achieve the double goals of increasing yield and reducing greenhouse gas emissions of rice fields in cold regions.